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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0808.2901 | Zohar Komargodski | Amit Giveon, Andrey Katz, Zohar Komargodski, David Shih | Dynamical SUSY and R-symmetry breaking in SQCD with massive and massless
flavors | 25 pages. v2: added references, minor correction | JHEP 0810:092,2008 | 10.1088/1126-6708/2008/10/092 | null | hep-th hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that supersymmetry and R-symmetry can be dynamically broken in a
long-lived metastable vacuum of SQCD with massive and massless flavors. The
vacuum results from a competition of a (leading) two-loop effect and small
"Planck" suppressed higher-dimension operators. This mechanism provides a
particularly simple realization of dynamical SUSY and R-symmetry breaking, and
as such it is a good starting point for building phenomenologically viable
models of gauge mediation. We take a preliminary step in this direction by
constructing a complete model of minimal gauge mediation. Here we find that the
parameters of the model are surprisingly constrained by the hidden sector.
Similar mechanisms for creating long-lived states operate in a large class of
models.
| [
{
"created": "Thu, 21 Aug 2008 11:10:29 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Aug 2008 22:18:06 GMT",
"version": "v2"
}
] | 2009-12-07 | [
[
"Giveon",
"Amit",
""
],
[
"Katz",
"Andrey",
""
],
[
"Komargodski",
"Zohar",
""
],
[
"Shih",
"David",
""
]
] | We show that supersymmetry and R-symmetry can be dynamically broken in a long-lived metastable vacuum of SQCD with massive and massless flavors. The vacuum results from a competition of a (leading) two-loop effect and small "Planck" suppressed higher-dimension operators. This mechanism provides a particularly simple realization of dynamical SUSY and R-symmetry breaking, and as such it is a good starting point for building phenomenologically viable models of gauge mediation. We take a preliminary step in this direction by constructing a complete model of minimal gauge mediation. Here we find that the parameters of the model are surprisingly constrained by the hidden sector. Similar mechanisms for creating long-lived states operate in a large class of models. |
1310.1948 | Abhishek Iyer M | Abhishek M Iyer | Revisiting neutrino masses from Planck scale operators | 31 Pages, 12 Figures, Abstract reworded, Discussion modified and
improved, quark fits included, EWSB discussion expanded, examples of lepton
mass fits with MFV included, v2 | Phys. Rev. D 89, 116008 (2014) | 10.1103/PhysRevD.89.116008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Planck scale lepton number violation is an interesting and natural
possibility to explain non-zero neutrino masses. We consider such operators in
the context of Randall-Sundrum (RS1) scenarios. Implementation of this scenario
with a single Higgs localized on the IR brane (standard RS1) is not
phenomenologically viable as they lead to inconsistencies in the charged lepton
mass fits. In this work we propose a set-up with two Higgs doublets. We present
a detailed numerical analysis of the fits to fermion masses and mixing angles.
This model solves the issues regarding the fermion mass fits but solutions with
consistent electroweak symmetry breaking are highly fine tuned. A simple
resolution is to consider supersymmetry in the bulk and a detailed discussion
of which is provided. Constraints from flavour are found to be strong and
Minimal Flavour Violation (MFV) is imposed to alleviate them.
| [
{
"created": "Mon, 7 Oct 2013 20:47:02 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Mar 2014 17:54:14 GMT",
"version": "v2"
}
] | 2014-06-18 | [
[
"Iyer",
"Abhishek M",
""
]
] | Planck scale lepton number violation is an interesting and natural possibility to explain non-zero neutrino masses. We consider such operators in the context of Randall-Sundrum (RS1) scenarios. Implementation of this scenario with a single Higgs localized on the IR brane (standard RS1) is not phenomenologically viable as they lead to inconsistencies in the charged lepton mass fits. In this work we propose a set-up with two Higgs doublets. We present a detailed numerical analysis of the fits to fermion masses and mixing angles. This model solves the issues regarding the fermion mass fits but solutions with consistent electroweak symmetry breaking are highly fine tuned. A simple resolution is to consider supersymmetry in the bulk and a detailed discussion of which is provided. Constraints from flavour are found to be strong and Minimal Flavour Violation (MFV) is imposed to alleviate them. |
2311.02585 | Shibendu Gupta Choudhury | Shibendu Gupta Choudhury and Soumya Chakrabarti | The fate of a Quantum-Corrected Collapsing Star in General Relativity | 31 pages, 33 figures, Comments are welcome | JCAP 01(2024) 007 | 10.1088/1475-7516/2024/01/007 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We incorporate some corrections inspired by loop quantum gravity into the
concept of gravitational collapse and propose a complete model of the dynamic
process. The model carries the essence of a mass-independent upper bound on the
curvature scalars originally found as a crucial feature of black holes in loop
quantum gravity. The quantum-inspired interior is immersed in a geometry filled
with null radiation and they are matched at a distinct boundary hypersurface.
The ultimate fate of the process depends on inhomogeneities of the metric
tensor cofficients. We find a critical parameter $\lambda$ embedded in the
inhomogeneity of the conformal factor of the interior metric. Examples with
$\lambda < 0$ enforce an eventual collapse to singularity and $\lambda > 0$
cases produce a non-singular collapse resulting in a loop-quantum-corrected
Schwarzschild geometry modulo a conformal factor. Interestingly, for $\lambda <
0$ as well, there exist situations where the quantum effects are able to cause
a bounce but fall short of preventing the ultimate formation of singularity.
The trapped surface formation condition is studied for $\lambda<0$ case to
infer about the visibility of the final singularity. Interestingly, we find a
possibility of formation of three horizons during the course of the collapse.
Eventually all of them merge into one single horizon which envelopes the final
singularity. For the non-singular case, there is a possibility that the sphere
can evolve into a wormhole throat whose radius is found to be inversely
proportional to the critical parameter $\lambda$. Depending on the nature of
evolution and the shell regions, the collapsing shells violate some standard
energy conditions which can be associated with the quantum inspired
corrections.
| [
{
"created": "Sun, 5 Nov 2023 08:03:28 GMT",
"version": "v1"
}
] | 2024-02-08 | [
[
"Choudhury",
"Shibendu Gupta",
""
],
[
"Chakrabarti",
"Soumya",
""
]
] | We incorporate some corrections inspired by loop quantum gravity into the concept of gravitational collapse and propose a complete model of the dynamic process. The model carries the essence of a mass-independent upper bound on the curvature scalars originally found as a crucial feature of black holes in loop quantum gravity. The quantum-inspired interior is immersed in a geometry filled with null radiation and they are matched at a distinct boundary hypersurface. The ultimate fate of the process depends on inhomogeneities of the metric tensor cofficients. We find a critical parameter $\lambda$ embedded in the inhomogeneity of the conformal factor of the interior metric. Examples with $\lambda < 0$ enforce an eventual collapse to singularity and $\lambda > 0$ cases produce a non-singular collapse resulting in a loop-quantum-corrected Schwarzschild geometry modulo a conformal factor. Interestingly, for $\lambda < 0$ as well, there exist situations where the quantum effects are able to cause a bounce but fall short of preventing the ultimate formation of singularity. The trapped surface formation condition is studied for $\lambda<0$ case to infer about the visibility of the final singularity. Interestingly, we find a possibility of formation of three horizons during the course of the collapse. Eventually all of them merge into one single horizon which envelopes the final singularity. For the non-singular case, there is a possibility that the sphere can evolve into a wormhole throat whose radius is found to be inversely proportional to the critical parameter $\lambda$. Depending on the nature of evolution and the shell regions, the collapsing shells violate some standard energy conditions which can be associated with the quantum inspired corrections. |
2001.05378 | Gabriel Condur\'u Magalh\~aes | Gabriel C. Magalh\~aes, Van S. Alves, Eduardo C. Marino, Leandro O.
Nascimento | Pseudo Quantum Electrodynamics and Chern-Simons theory Coupled to
Two-dimensional Electrons | null | Phys. Rev. D 101, 116005 (2020) | 10.1103/PhysRevD.101.116005 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a nonlocal theory that combines both the Pseudo quantum
electrodynamics (PQED) and Chern-Simons actions among two-dimensional
electrons. In the static limit, we conclude that the competition of these two
interactions yields a Coulomb potential with a screened electric charge given
by $e^2/(1+\theta^2)$, where $\theta$ is the dimensionless Chern-Simons
parameter. This could be useful for describing the substrate interaction with
two-dimensional materials and the doping dependence of the dielectric constant
in graphene. In the dynamical limit, we calculate the effective current-current
action of the model considering Dirac electrons. We show that this resembles
the electromagnetic and statistical interactions, but with two different
overall constants, given by $e^2/(1+\theta^2)$ and $e^2\theta/(1+\theta^2)$.
Therefore, the $\theta$-parameter does not provide a topological mass for the
Gauge field in PQED, which is a relevant difference in comparison with quantum
electrodynamics. Thereafter, we apply the one-loop perturbation theory in our
model. Within this approach, we calculate the electron self-energy, the
electron renormalized mass, the corrected gauge-field propagator, and the
renormalized Fermi velocity for both high- and low-speed limits, using the
renormalization group. In particular, we obtain a maximum value of the
renormalized mass for $\theta\approx 0.36$. This behavior is an important
signature of the model and relations with doping control of band gap size are
also discussed in the conclusions.
| [
{
"created": "Wed, 15 Jan 2020 15:32:05 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jan 2020 16:33:57 GMT",
"version": "v2"
},
{
"created": "Wed, 18 Mar 2020 00:19:10 GMT",
"version": "v3"
},
{
"created": "Wed, 13 May 2020 12:11:23 GMT",
"version": "v4"
}
] | 2020-07-01 | [
[
"Magalhães",
"Gabriel C.",
""
],
[
"Alves",
"Van S.",
""
],
[
"Marino",
"Eduardo C.",
""
],
[
"Nascimento",
"Leandro O.",
""
]
] | We study a nonlocal theory that combines both the Pseudo quantum electrodynamics (PQED) and Chern-Simons actions among two-dimensional electrons. In the static limit, we conclude that the competition of these two interactions yields a Coulomb potential with a screened electric charge given by $e^2/(1+\theta^2)$, where $\theta$ is the dimensionless Chern-Simons parameter. This could be useful for describing the substrate interaction with two-dimensional materials and the doping dependence of the dielectric constant in graphene. In the dynamical limit, we calculate the effective current-current action of the model considering Dirac electrons. We show that this resembles the electromagnetic and statistical interactions, but with two different overall constants, given by $e^2/(1+\theta^2)$ and $e^2\theta/(1+\theta^2)$. Therefore, the $\theta$-parameter does not provide a topological mass for the Gauge field in PQED, which is a relevant difference in comparison with quantum electrodynamics. Thereafter, we apply the one-loop perturbation theory in our model. Within this approach, we calculate the electron self-energy, the electron renormalized mass, the corrected gauge-field propagator, and the renormalized Fermi velocity for both high- and low-speed limits, using the renormalization group. In particular, we obtain a maximum value of the renormalized mass for $\theta\approx 0.36$. This behavior is an important signature of the model and relations with doping control of band gap size are also discussed in the conclusions. |
2007.08768 | Rishav Roshan | Basabendu Barman, Debasish Borah, Rishav Roshan | Effective Theory of Freeze-in Dark Matter | 60 pages, 6 tables, 11 figures, added two new sections, accepted for
publication in JCAP | null | 10.1088/1475-7516/2020/11/021 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a model independent study of freeze-in of massive particle dark
matter (DM) by adopting an effective field theory framework. Considering the
dark matter to be a gauge singlet Majorana fermion, odd under a stabilising
symmetry $Z_2$ under which all standard model (SM) fields are even, we write
down all possible DM-SM operators upto and including mass dimension eight. For
simplicity of the numerical analysis we restrict ourselves only to the scalar
operators in SM as well as in the dark sector. We calculate the DM abundance
for each such dimension of operator considering both UV and IR freeze-in
contributions which can arise before and after the electroweak symmetry
breaking respectively. After constraining the cut-off scale and reheat
temperature of the universe from the requirement of correct DM relic abundance,
we also study the possibility of connecting the origin of neutrino mass to the
same cut-off scale by virtue of lepton number violating Weinberg operators. We
thus compare the bounds on such cut-off scale and corresponding reheat
temperature required for UV freeze-in from the origin of light neutrino mass as
well as from the requirement of correct DM relic abundance. We also briefly
comment upon the possibilities of realising such DM-SM effective operators in a
UV complete model.
| [
{
"created": "Fri, 17 Jul 2020 05:41:27 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Sep 2020 16:30:50 GMT",
"version": "v2"
}
] | 2020-11-25 | [
[
"Barman",
"Basabendu",
""
],
[
"Borah",
"Debasish",
""
],
[
"Roshan",
"Rishav",
""
]
] | We perform a model independent study of freeze-in of massive particle dark matter (DM) by adopting an effective field theory framework. Considering the dark matter to be a gauge singlet Majorana fermion, odd under a stabilising symmetry $Z_2$ under which all standard model (SM) fields are even, we write down all possible DM-SM operators upto and including mass dimension eight. For simplicity of the numerical analysis we restrict ourselves only to the scalar operators in SM as well as in the dark sector. We calculate the DM abundance for each such dimension of operator considering both UV and IR freeze-in contributions which can arise before and after the electroweak symmetry breaking respectively. After constraining the cut-off scale and reheat temperature of the universe from the requirement of correct DM relic abundance, we also study the possibility of connecting the origin of neutrino mass to the same cut-off scale by virtue of lepton number violating Weinberg operators. We thus compare the bounds on such cut-off scale and corresponding reheat temperature required for UV freeze-in from the origin of light neutrino mass as well as from the requirement of correct DM relic abundance. We also briefly comment upon the possibilities of realising such DM-SM effective operators in a UV complete model. |
1601.03748 | Matthias Steinhauser | Peter Marquard, Alexander V. Smirnov, Vladimir A. Smirnov, Matthias
Steinhauser | Four-loop relation between the $\bar{\rm MS}$ and on-shell quark mass | 9 pages, 2 figures, to appear in the proceedings of the 12th
International Symposium on Radiative Corrections (Radcor 2015) and LoopFest
XIV (Radiative Corrections for the LHC and Future Colliders) | null | null | TTP16-003, HU-EP-16/03, DESY 16-006 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this contribution we discuss the four-loop relation between the on-shell
and $\bar{\rm MS}$ definition of heavy quark masses which is applied to the
top, bottom and charm case. We also present relations between the $\bar{\rm
MS}$ quark mass and various threshold mass definitions and discuss the
uncertainty at next-to-next-to-next-to-leading order.
| [
{
"created": "Thu, 14 Jan 2016 21:00:15 GMT",
"version": "v1"
}
] | 2016-01-18 | [
[
"Marquard",
"Peter",
""
],
[
"Smirnov",
"Alexander V.",
""
],
[
"Smirnov",
"Vladimir A.",
""
],
[
"Steinhauser",
"Matthias",
""
]
] | In this contribution we discuss the four-loop relation between the on-shell and $\bar{\rm MS}$ definition of heavy quark masses which is applied to the top, bottom and charm case. We also present relations between the $\bar{\rm MS}$ quark mass and various threshold mass definitions and discuss the uncertainty at next-to-next-to-next-to-leading order. |
1803.03136 | Alka Upadhyay | Pallavi Gupta, A. Upadhyay | Placing the newly observed state $B_{J}(5840)$ in bottom spectra along
with states $B_{1}(5721)$, $B_{2}^{*}(5747)$, $B_{s1}(5830)$,
$B_{2s}^{*}(5840)$ and $B_{J}(5970)$ | 10Pages, 1Figure, 6 Tables. arXiv admin note: substantial text
overlap with arXiv:1801.00404 | Phys. Rev. D 99, 094043 (2019) | 10.1103/PhysRevD.99.094043 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we study the two body strong decays with the emission of
light pseudo-scalar mesons $(\pi, \eta, K)$ for higher excited bottom states
with in the framework of HQET. Inspired from the recent observation of bottom
meson $B_{J}(5840)$ by LHCb collaboration \cite{9}, we classify the six
possible $J^{P}$'s for this state on the basis of the theoretically available
masses. By analyzing the strong decay widths and the branching ratios for all
these six cases of $B_{J}(5840)$, we justify one of them to be the most
favorable assignment for it. We also examined the recently observed bottom
state $B_{J}(5970)$ as 2S$1^{-}$ and states $B_{J}(5721)$ and $B_{2}^{*}(5747)$
with their strange partners $B_{s1}(5830)$ and $B_{2s}^{*}(5840)$ for their
$J^{P}$'s as $1P_{3/2}1^{+}$ and $1P_{3/2}2^{+}$ respectively. The predicted
coupling constants $g_{XH}$, $\widetilde{g}_{HH}$ and $g_{TH}$ helps in
redeeming the strong decay width of experimentally missing bottom states $B(2
^{1}S_{0})$, $B_{s}(2 ^{3}S_{1})$, $B_{s}(2 ^{1}S_{0})$, $B(1 ^{1}D_{2})$,
$B_{s}(1 ^{3}D_{1})$ and $B_{s}(1 ^{1}D_{2})$. These predictions provide a
crucial information for upcoming experimental studies.
| [
{
"created": "Wed, 7 Mar 2018 05:30:29 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Mar 2019 07:34:08 GMT",
"version": "v2"
},
{
"created": "Tue, 14 May 2019 05:54:30 GMT",
"version": "v3"
}
] | 2019-06-05 | [
[
"Gupta",
"Pallavi",
""
],
[
"Upadhyay",
"A.",
""
]
] | In this article, we study the two body strong decays with the emission of light pseudo-scalar mesons $(\pi, \eta, K)$ for higher excited bottom states with in the framework of HQET. Inspired from the recent observation of bottom meson $B_{J}(5840)$ by LHCb collaboration \cite{9}, we classify the six possible $J^{P}$'s for this state on the basis of the theoretically available masses. By analyzing the strong decay widths and the branching ratios for all these six cases of $B_{J}(5840)$, we justify one of them to be the most favorable assignment for it. We also examined the recently observed bottom state $B_{J}(5970)$ as 2S$1^{-}$ and states $B_{J}(5721)$ and $B_{2}^{*}(5747)$ with their strange partners $B_{s1}(5830)$ and $B_{2s}^{*}(5840)$ for their $J^{P}$'s as $1P_{3/2}1^{+}$ and $1P_{3/2}2^{+}$ respectively. The predicted coupling constants $g_{XH}$, $\widetilde{g}_{HH}$ and $g_{TH}$ helps in redeeming the strong decay width of experimentally missing bottom states $B(2 ^{1}S_{0})$, $B_{s}(2 ^{3}S_{1})$, $B_{s}(2 ^{1}S_{0})$, $B(1 ^{1}D_{2})$, $B_{s}(1 ^{3}D_{1})$ and $B_{s}(1 ^{1}D_{2})$. These predictions provide a crucial information for upcoming experimental studies. |
0810.4606 | Masaki Asano | Masaki Asano, Junji Hisano, Takashi Okada, Shohei Sugiyama | A Realistic Extension of Gauge-Mediated SUSY-Breaking Model with
Superconformal Hidden Sector | 15 pages, 2 figures, 1 table | Phys.Lett.B673:146-151,2009 | 10.1016/j.physletb.2009.02.010 | ICRR-REPORT-532, IPMU 08-0081 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The sequestering of supersymmetry (SUSY) breaking parameters, which is
induced by superconformal hidden sector, is one of the solutions for the
mu/B_mu problem in gauge-mediated SUSY-breaking scenario. However, it is found
that the minimal messenger model does not derive the correct electroweak
symmetry breaking. In this paper we present a model which has the coupling of
the messengers with the SO(10) GUT-symmetry breaking Higgs fields. The model is
one of the realistic extensions of the gauge mediation model with
superconformal hidden sector. It is shown that the extension is applicable for
a broad range of conformality breaking scale.
| [
{
"created": "Sat, 25 Oct 2008 15:16:36 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Feb 2009 07:56:59 GMT",
"version": "v2"
}
] | 2010-04-21 | [
[
"Asano",
"Masaki",
""
],
[
"Hisano",
"Junji",
""
],
[
"Okada",
"Takashi",
""
],
[
"Sugiyama",
"Shohei",
""
]
] | The sequestering of supersymmetry (SUSY) breaking parameters, which is induced by superconformal hidden sector, is one of the solutions for the mu/B_mu problem in gauge-mediated SUSY-breaking scenario. However, it is found that the minimal messenger model does not derive the correct electroweak symmetry breaking. In this paper we present a model which has the coupling of the messengers with the SO(10) GUT-symmetry breaking Higgs fields. The model is one of the realistic extensions of the gauge mediation model with superconformal hidden sector. It is shown that the extension is applicable for a broad range of conformality breaking scale. |
1406.5112 | Thomas Linz | Thomas M. Linz, John L. Friedman, Alan G. Wiseman | Combined gravitational and electromagnetic self-force on charged
particles in electrovac spacetimes | Submitted to Phys Rev. D | Phys. Rev. D 90, 084031 (2014) | 10.1103/PhysRevD.90.084031 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the self-force on a charged particle moving in a curved spacetime
with a background electromagnetic field, extending previous studies to
situations in which gravitational and electromagnetic perturbations are
comparable. The formal expression $f^{ret}_\alpha$ for the self-force on a
particle, written in terms of the retarded perturbed fields, is divergent, and
a renormalization is needed to find the particle's acceleration at linear order
in its mass $m$ and charge $e$. We assume that, as in previous work in a Lorenz
gauge, the renormalization for accelerated motion comprises an angle average
and mass renormalization. Using the short distance expansion of the perturbed
electromagnetic and gravitational fields, we show that the renormalization is
equivalent to that obtained from a mode sum regularization in which one
subtracts from the expression for the self-force in terms of the retarded
fields a singular part field comprising only the leading and subleading terms
in the mode sum. The most striking part of our result, arising from a
remarkable cancellation, is that the renormalization involves no mixing of
electromagnetic and gravitational fields. In particular, the renormalized mass
is obtained by subtracting (1) the purely electromagnetic contribution from a
point charge moving along an accelerated trajectory and (2) the purely
gravitational contribution from a point mass moving along the same trajectory.
In a mode-sum regularization, the same cancellation implies that the required
regularization parameters are sums of their purely electromagnetic and
gravitational values.
| [
{
"created": "Thu, 19 Jun 2014 17:00:12 GMT",
"version": "v1"
}
] | 2014-10-22 | [
[
"Linz",
"Thomas M.",
""
],
[
"Friedman",
"John L.",
""
],
[
"Wiseman",
"Alan G.",
""
]
] | We consider the self-force on a charged particle moving in a curved spacetime with a background electromagnetic field, extending previous studies to situations in which gravitational and electromagnetic perturbations are comparable. The formal expression $f^{ret}_\alpha$ for the self-force on a particle, written in terms of the retarded perturbed fields, is divergent, and a renormalization is needed to find the particle's acceleration at linear order in its mass $m$ and charge $e$. We assume that, as in previous work in a Lorenz gauge, the renormalization for accelerated motion comprises an angle average and mass renormalization. Using the short distance expansion of the perturbed electromagnetic and gravitational fields, we show that the renormalization is equivalent to that obtained from a mode sum regularization in which one subtracts from the expression for the self-force in terms of the retarded fields a singular part field comprising only the leading and subleading terms in the mode sum. The most striking part of our result, arising from a remarkable cancellation, is that the renormalization involves no mixing of electromagnetic and gravitational fields. In particular, the renormalized mass is obtained by subtracting (1) the purely electromagnetic contribution from a point charge moving along an accelerated trajectory and (2) the purely gravitational contribution from a point mass moving along the same trajectory. In a mode-sum regularization, the same cancellation implies that the required regularization parameters are sums of their purely electromagnetic and gravitational values. |
hep-th/0108074 | Pat Malone | D.G.C. McKeon (University of Western Ontario), T.N. Sherry (National
University of Ireland, Galway) | Supersymmetry and Superfields in Three Euclidean Dimensions | null | null | null | null | hep-th | null | The simplest supersymmetry algebra and superspace in three dimensional
Euclidean (3dE) space is examined. Representations of the algebra are
considered and the implications of restricting the space of states to states
with positive definite norm are determined.
A superspace is defined and superfields are introduced. Supersymmetric field
theory models in 3dE are described both in superfield and component field
forms. The relationship between these models, and similar models in four
dimensional Minkowski space is described.
| [
{
"created": "Fri, 10 Aug 2001 16:02:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"McKeon",
"D. G. C.",
"",
"University of Western Ontario"
],
[
"Sherry",
"T. N.",
"",
"National\n University of Ireland, Galway"
]
] | The simplest supersymmetry algebra and superspace in three dimensional Euclidean (3dE) space is examined. Representations of the algebra are considered and the implications of restricting the space of states to states with positive definite norm are determined. A superspace is defined and superfields are introduced. Supersymmetric field theory models in 3dE are described both in superfield and component field forms. The relationship between these models, and similar models in four dimensional Minkowski space is described. |
1401.6985 | Roldao da Rocha | D. Bazeia, J. M. Hoff da Silva, Roldao da Rocha | Regular Bulk Solutions and Black Strings from Dynamical Braneworlds with
Variable Tension | 22 pages, 12 figures. Analysis of the regular bulk improved | Phys. Rev. D 90, 047902 (2014) | 10.1103/PhysRevD.90.047902 | null | hep-th gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Regular black strings solutions associated to a dynamical
Friedmann-Robertson-Walker braneworld are obtained as a particular case of a
regular bulk metric, in the context of a variable brane tension. By analyzing
the 5D Kretschmann invariants, we show that the variable brane tension is
capable to remove bulk singularities, along some eras of the evolution of the
Universe. In particular, the black string time-dependent profile in the bulk is
analyzed in the context of the McVittie metric on an E\"otv\"os fluid
braneworld, wherein the fluid dynamical brane tension depends on the brane
temperature. The whole bulk is shown to be regular for a Universe dominated by
non-relativistic matter or by relativistic matter/radiation, as the
cosmological time elapses. In a particular case the associated black strings
are shown to have finite extension along the extra dimension, what prominently
modify the higher-dimensional physical singularities. For a Universe dominated
by matter or radiation, we show that the brane singularities are removed along
the extra dimension, as an effect of the variable brane tension, corresponding
also to the vanishing of the black string horizon. In this case there is a
regular solution in the bulk. We show further that no additional physical
singularity is introduced in the bulk when the Universe is dominated by a
cosmological constant.
| [
{
"created": "Mon, 27 Jan 2014 19:56:02 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Mar 2014 22:49:14 GMT",
"version": "v2"
}
] | 2014-09-05 | [
[
"Bazeia",
"D.",
""
],
[
"da Silva",
"J. M. Hoff",
""
],
[
"da Rocha",
"Roldao",
""
]
] | Regular black strings solutions associated to a dynamical Friedmann-Robertson-Walker braneworld are obtained as a particular case of a regular bulk metric, in the context of a variable brane tension. By analyzing the 5D Kretschmann invariants, we show that the variable brane tension is capable to remove bulk singularities, along some eras of the evolution of the Universe. In particular, the black string time-dependent profile in the bulk is analyzed in the context of the McVittie metric on an E\"otv\"os fluid braneworld, wherein the fluid dynamical brane tension depends on the brane temperature. The whole bulk is shown to be regular for a Universe dominated by non-relativistic matter or by relativistic matter/radiation, as the cosmological time elapses. In a particular case the associated black strings are shown to have finite extension along the extra dimension, what prominently modify the higher-dimensional physical singularities. For a Universe dominated by matter or radiation, we show that the brane singularities are removed along the extra dimension, as an effect of the variable brane tension, corresponding also to the vanishing of the black string horizon. In this case there is a regular solution in the bulk. We show further that no additional physical singularity is introduced in the bulk when the Universe is dominated by a cosmological constant. |
1409.1984 | Ryotaro Kase | Ryotaro Kase and Shinji Tsujikawa | Effective field theory approach to modified gravity including Horndeski
theory and Ho\v{r}ava-Lifshitz gravity | 27 pages | Int. J. Mod. Phys. D 23, 1443008 (2014) | 10.1142/S0218271814430081 | null | hep-th astro-ph.CO gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the effective field theory of modified gravity in which the
Lagrangian involves three dimensional geometric quantities appearing in the 3+1
decomposition of space-time. On the flat isotropic cosmological background we
expand a general action up to second order in the perturbations of geometric
scalars, by taking into account spatial derivatives higher than two. Our
analysis covers a wide range of gravitational theories-- including Horndeski
theory/its recent generalizations and the projectable/non-projectable versions
of Ho\v{r}ava-Lifshitz gravity. We derive the equations of motion for linear
cosmological perturbations and apply them to the calculations of inflationary
power spectra as well as the dark energy dynamics in Galileon theories. We also
show that our general results conveniently recover stability conditions of
Ho\v{r}ava-Lifshitz gravity already derived in the literature.
| [
{
"created": "Sat, 6 Sep 2014 06:06:49 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Feb 2015 10:49:25 GMT",
"version": "v2"
}
] | 2015-02-24 | [
[
"Kase",
"Ryotaro",
""
],
[
"Tsujikawa",
"Shinji",
""
]
] | We review the effective field theory of modified gravity in which the Lagrangian involves three dimensional geometric quantities appearing in the 3+1 decomposition of space-time. On the flat isotropic cosmological background we expand a general action up to second order in the perturbations of geometric scalars, by taking into account spatial derivatives higher than two. Our analysis covers a wide range of gravitational theories-- including Horndeski theory/its recent generalizations and the projectable/non-projectable versions of Ho\v{r}ava-Lifshitz gravity. We derive the equations of motion for linear cosmological perturbations and apply them to the calculations of inflationary power spectra as well as the dark energy dynamics in Galileon theories. We also show that our general results conveniently recover stability conditions of Ho\v{r}ava-Lifshitz gravity already derived in the literature. |
1003.1718 | Yuri Shirman | Csaba Csaki, Yuri Shirman, and John Terning | Electroweak Symmetry Breaking From Monopole Condensation | Absence of pseudo-Goldstone bosons explain, discussion of the role of
flavor physics clarified, other minor changes. References added | Phys.Rev.Lett.106:041802,2011 | 10.1103/PhysRevLett.106.041802 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine models where massless chiral fermions with both "electric" and
"magnetic" hypercharges could form condensates. When some of the fermions are
also electroweak doublets such condensates can break the electroweak gauge
symmetry down to electromagnetism in the correct way. Since ordinary
hypercharge is weakly coupled at the TeV scale, magnetic hypercharge is
strongly coupled and can potentially drive the condensation. Such models are
similar to technicolor, but with hypercharge playing the role of the
technicolor gauge group, so the standard model gauge group breaks itself. A
heavy top mass can be generated via the Rubakov-Callan effect and could thus
decouple the scale of flavor physics from the electroweak scale.
| [
{
"created": "Mon, 8 Mar 2010 21:00:09 GMT",
"version": "v1"
},
{
"created": "Wed, 5 May 2010 20:43:42 GMT",
"version": "v2"
}
] | 2011-02-02 | [
[
"Csaki",
"Csaba",
""
],
[
"Shirman",
"Yuri",
""
],
[
"Terning",
"John",
""
]
] | We examine models where massless chiral fermions with both "electric" and "magnetic" hypercharges could form condensates. When some of the fermions are also electroweak doublets such condensates can break the electroweak gauge symmetry down to electromagnetism in the correct way. Since ordinary hypercharge is weakly coupled at the TeV scale, magnetic hypercharge is strongly coupled and can potentially drive the condensation. Such models are similar to technicolor, but with hypercharge playing the role of the technicolor gauge group, so the standard model gauge group breaks itself. A heavy top mass can be generated via the Rubakov-Callan effect and could thus decouple the scale of flavor physics from the electroweak scale. |
1002.2566 | Mikhail Altaisky | M.V. Altaisky | Quantum field theory without divergences | 6 pages, LaTeX, revtex, 2 eps figures | Phys.Rev.D81:125003,2010 | 10.1103/PhysRevD.81.125003 | null | hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that loop divergences emerging in the Green functions in quantum
field theory originate from correspondence of the Green functions to {\em
unmeasurable} (and hence unphysical) quantities. This is because no physical
quantity can be measured in a point, but in a region, the size of which is
constrained by the resolution of measuring equipment. The incorporation of the
resolution into the definition of quantum fields $\phi(x)\to\phi^{(A)}(x)$ and
appropriate change of Feynman rules results in finite values of the Green
functions. The Euclidean $\phi^4$-field theory is taken as an example.
| [
{
"created": "Fri, 12 Feb 2010 14:45:49 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Mar 2010 16:33:21 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Apr 2010 18:06:12 GMT",
"version": "v3"
},
{
"created": "Sun, 6 Jun 2010 07:30:33 GMT",
"version": "v4"
},
{
"cr... | 2013-05-08 | [
[
"Altaisky",
"M. V.",
""
]
] | It is shown that loop divergences emerging in the Green functions in quantum field theory originate from correspondence of the Green functions to {\em unmeasurable} (and hence unphysical) quantities. This is because no physical quantity can be measured in a point, but in a region, the size of which is constrained by the resolution of measuring equipment. The incorporation of the resolution into the definition of quantum fields $\phi(x)\to\phi^{(A)}(x)$ and appropriate change of Feynman rules results in finite values of the Green functions. The Euclidean $\phi^4$-field theory is taken as an example. |
2209.13693 | Artyom Astashenok V | Artyom V. Astashenok, Sergey D. Odintsov, Vasilis K. Oikonomou | Maximal Masses of White Dwarfs for Polytropes in $R^2$ Gravity and
Theoretical Constraints | 13 pp., 6 figures, to appear in Phys. Rev. D | null | 10.1103/PhysRevD.106.124010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the Chandrasekhar limit for white dwarfs in $f(R)$ gravity, with a
simple polytropic equation of state describing stellar matter. We use the most
popular $f(R)$ gravity model, namely the $f(R)=R+\alpha R^2$ gravity, and
calculate the parameters of the stellar configurations with polytropic equation
of state of the form $p=K\rho^{1+1/n}$ for various values of the parameter $n$.
In order to simplify our analysis we use the equivalent Einstein frame form of
$R^2$-gravity which is basically a scalar-tensor theory with well-known
potential for the scalar field. In this description one can use simple
approximations for the scalar field $\phi$ leaving only the potential term for
it. Our analysis indicates that for the non-relativistic case with $n=3/2$,
discrepancies between the $R^2$-gravity and General Relativity can appear only
when the parameter $\alpha$ of the $R^2$ term, takes values close to maximal
limit derived from the binary pulsar data namely $\alpha_{max}=5\times 10^{15}$
cm$^2$. Thus, the study of low-mass white dwarfs can hardly give restrictions
on the parameter $\alpha$. For relativistic polytropes with $n=3$ we found that
Chandrasekhar limit can in principle change for smaller $\alpha$ values. The
main conclusion from our calculations is the existence of white dwarfs with
large masses $\sim 1.33 M_{\odot}$, which can impose more strict limits on the
parameter $\alpha$ for the $R^2$ gravity model. Specifically, our estimations
on the parameter $\alpha$ of the $R^2$ model is $\alpha \sim 10^{13}$ cm$^2$.
| [
{
"created": "Tue, 27 Sep 2022 21:13:23 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Nov 2022 10:03:21 GMT",
"version": "v2"
}
] | 2022-12-21 | [
[
"Astashenok",
"Artyom V.",
""
],
[
"Odintsov",
"Sergey D.",
""
],
[
"Oikonomou",
"Vasilis K.",
""
]
] | We examine the Chandrasekhar limit for white dwarfs in $f(R)$ gravity, with a simple polytropic equation of state describing stellar matter. We use the most popular $f(R)$ gravity model, namely the $f(R)=R+\alpha R^2$ gravity, and calculate the parameters of the stellar configurations with polytropic equation of state of the form $p=K\rho^{1+1/n}$ for various values of the parameter $n$. In order to simplify our analysis we use the equivalent Einstein frame form of $R^2$-gravity which is basically a scalar-tensor theory with well-known potential for the scalar field. In this description one can use simple approximations for the scalar field $\phi$ leaving only the potential term for it. Our analysis indicates that for the non-relativistic case with $n=3/2$, discrepancies between the $R^2$-gravity and General Relativity can appear only when the parameter $\alpha$ of the $R^2$ term, takes values close to maximal limit derived from the binary pulsar data namely $\alpha_{max}=5\times 10^{15}$ cm$^2$. Thus, the study of low-mass white dwarfs can hardly give restrictions on the parameter $\alpha$. For relativistic polytropes with $n=3$ we found that Chandrasekhar limit can in principle change for smaller $\alpha$ values. The main conclusion from our calculations is the existence of white dwarfs with large masses $\sim 1.33 M_{\odot}$, which can impose more strict limits on the parameter $\alpha$ for the $R^2$ gravity model. Specifically, our estimations on the parameter $\alpha$ of the $R^2$ model is $\alpha \sim 10^{13}$ cm$^2$. |
1003.4811 | Niayesh Afshordi | Niayesh Afshordi (Perimeter/Waterloo) | Dark Energy, Black Hole Entropy, and the First Precision Measurement in
Quantum Gravity | 4 pages, comments are welcome | null | null | null | hep-th astro-ph.CO astro-ph.HE gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The two apparently distinct phenomena of dark energy (or late-time cosmic
acceleration) and quantum gravity dominate physics on extremely low, and
extremely high energies, but do not seem to have any apparent empirical
connection. Nevertheless, the two have a theoretical connection, through the
cosmological constant problem. I argue that the finite temperature quantum
gravitational corrections to black hole entropy yields a pressure for the
gravitational vacuum (or gravitational aether). Assuming that the relative
corrections are linear in horizon temperature (i.e. are suppressed by one power
of Planck energy), the pressure is comparable to that of dark energy for
astrophysical black holes. This implies that the observation of late-time
cosmic acceleration may have provided us with the first precision measurement
of quantum gravity, i.e. that of black hole entropy.
| [
{
"created": "Thu, 25 Mar 2010 06:33:16 GMT",
"version": "v1"
}
] | 2010-03-26 | [
[
"Afshordi",
"Niayesh",
"",
"Perimeter/Waterloo"
]
] | The two apparently distinct phenomena of dark energy (or late-time cosmic acceleration) and quantum gravity dominate physics on extremely low, and extremely high energies, but do not seem to have any apparent empirical connection. Nevertheless, the two have a theoretical connection, through the cosmological constant problem. I argue that the finite temperature quantum gravitational corrections to black hole entropy yields a pressure for the gravitational vacuum (or gravitational aether). Assuming that the relative corrections are linear in horizon temperature (i.e. are suppressed by one power of Planck energy), the pressure is comparable to that of dark energy for astrophysical black holes. This implies that the observation of late-time cosmic acceleration may have provided us with the first precision measurement of quantum gravity, i.e. that of black hole entropy. |
hep-th/0612176 | Zengguang Huang | Z. G. Huang, Q. Q. Sun, W. Fang and H. Q. Lu | Potentials of Coupled Quintessence Based on a Dilaton | 6 pages, 4 figures, abstract and some paragraphs corrected, one
reference and fund No. added, accepted by Mod. Phys. Lett. A | Mod.Phys.Lett.A22:3073-3082,2008 | 10.1142/S0217732307023432 | null | hep-th | null | In this paper, we regard dilaton in Weyl-scaled induced gravitational theory
as coupled Quintessence, which is called DCQ model by us. Parametrization of
the dark energy model is a good method by which we can construct the scalar
potential directly from the effective equation of state function
$\omega_\sigma(z)$ describing the properties of the dark energy. Applying this
method to the DCQ model, we consider four parametrizations of $\omega(z)$ and
investigate the features of the constructed DCQ potentials, which possess two
different evolutive behaviors called "O" mode and "E" mode. Lastly, we comprise
the results of the constructed DCQ model with those of quintessence model
numerically.
| [
{
"created": "Sun, 17 Dec 2006 03:20:00 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Dec 2006 04:16:58 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Aug 2007 08:17:37 GMT",
"version": "v3"
},
{
"created": "Sat, 15 Sep 2007 04:37:03 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Huang",
"Z. G.",
""
],
[
"Sun",
"Q. Q.",
""
],
[
"Fang",
"W.",
""
],
[
"Lu",
"H. Q.",
""
]
] | In this paper, we regard dilaton in Weyl-scaled induced gravitational theory as coupled Quintessence, which is called DCQ model by us. Parametrization of the dark energy model is a good method by which we can construct the scalar potential directly from the effective equation of state function $\omega_\sigma(z)$ describing the properties of the dark energy. Applying this method to the DCQ model, we consider four parametrizations of $\omega(z)$ and investigate the features of the constructed DCQ potentials, which possess two different evolutive behaviors called "O" mode and "E" mode. Lastly, we comprise the results of the constructed DCQ model with those of quintessence model numerically. |
hep-th/9808112 | Andrzej Z. Gorski | Andrzej Z. Gorski and Jacek Szmigielski | Representations of the Heisenberg algebra by difference operators | 10 pages, LaTeX+RevTeX | Acta Phys.Polon. B31 (2000) 789-799 | null | INP 8/98 | hep-th quant-ph | null | We construct a class of representations of the Heisenberg algebra in terms of
the complex shift operators subject to the proper continuous limit imposed by
the correspondence principle. We find a suitable Hilbert space formulation of
our construction for two types of shifts: (1) real shifts, (2) purely imaginary
shifts. The representations involving imaginary shifts are free of spectrum
doubling. We determine the corresponding coordinate and momentum operators
satisfying the canonical commutation relations. The eigenvalues of the
coordinate operator are in both cases discrete.
| [
{
"created": "Wed, 19 Aug 1998 11:00:38 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gorski",
"Andrzej Z.",
""
],
[
"Szmigielski",
"Jacek",
""
]
] | We construct a class of representations of the Heisenberg algebra in terms of the complex shift operators subject to the proper continuous limit imposed by the correspondence principle. We find a suitable Hilbert space formulation of our construction for two types of shifts: (1) real shifts, (2) purely imaginary shifts. The representations involving imaginary shifts are free of spectrum doubling. We determine the corresponding coordinate and momentum operators satisfying the canonical commutation relations. The eigenvalues of the coordinate operator are in both cases discrete. |
0804.0476 | Matthew Buckley | Matthew R. Buckley, Beate Heinemann, William Klemm, and Hitoshi
Murayama | Quantum Interference Effects Among Helicities at LEP-II and Tevatron | 6 pages, 5 figures, 7 tables | Phys.Rev.D77:113017,2008 | 10.1103/PhysRevD.77.113017 | IPMU 08-0017, UCB-PTH-08/07 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A completely model-independent method of obtaining information on the spin
using the quantum interference effect among various helicity states was
proposed in a recent paper. Here we point out that this effect should be
demonstrable in the existing data on e^-e^+ \to W^+ W^- at LEP-II and p \bar{p}
\to Z^0 + j at Tevatron.
| [
{
"created": "Thu, 3 Apr 2008 08:59:11 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Buckley",
"Matthew R.",
""
],
[
"Heinemann",
"Beate",
""
],
[
"Klemm",
"William",
""
],
[
"Murayama",
"Hitoshi",
""
]
] | A completely model-independent method of obtaining information on the spin using the quantum interference effect among various helicity states was proposed in a recent paper. Here we point out that this effect should be demonstrable in the existing data on e^-e^+ \to W^+ W^- at LEP-II and p \bar{p} \to Z^0 + j at Tevatron. |
1801.01496 | Jaroslav Trnka | Clifford Cheung, Karol Kampf, Jiri Novotny, Chia-Hsien Shen, Jaroslav
Trnka, Congkao Wen | Vector Effective Field Theories from Soft Limits | 6 pages, 2 figures | Phys. Rev. Lett. 120, 261602 (2018) | 10.1103/PhysRevLett.120.261602 | CALT-TH-2017-074 | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a bottom-up construction of vector effective field theories using
the infrared structure of scattering amplitudes. Our results employ two
distinct probes of soft kinematics: multiple soft limits and single soft limits
after dimensional reduction, applicable in four and general dimensions,
respectively. Both approaches uniquely specify the Born-Infeld (BI) model as
the only theory of vectors completely fixed by certain infrared conditions
which generalize the Adler zero for pions. These soft properties imply new
recursion relations for on-shell scattering amplitudes in BI theory and suggest
the existence of a wider class of vector effective field theories.
| [
{
"created": "Thu, 4 Jan 2018 19:00:01 GMT",
"version": "v1"
}
] | 2018-07-04 | [
[
"Cheung",
"Clifford",
""
],
[
"Kampf",
"Karol",
""
],
[
"Novotny",
"Jiri",
""
],
[
"Shen",
"Chia-Hsien",
""
],
[
"Trnka",
"Jaroslav",
""
],
[
"Wen",
"Congkao",
""
]
] | We present a bottom-up construction of vector effective field theories using the infrared structure of scattering amplitudes. Our results employ two distinct probes of soft kinematics: multiple soft limits and single soft limits after dimensional reduction, applicable in four and general dimensions, respectively. Both approaches uniquely specify the Born-Infeld (BI) model as the only theory of vectors completely fixed by certain infrared conditions which generalize the Adler zero for pions. These soft properties imply new recursion relations for on-shell scattering amplitudes in BI theory and suggest the existence of a wider class of vector effective field theories. |
1808.02963 | Tony Rothman | Tony Rothman, Mariam Campbell, Rituparno Goswami, George F.R. Ellis | Direct Detection of Universal Expansion by Holonomy in the McVittie
Spacetime | 10 pages, 5 figures. This version corrects an error in the previous
version and is as will appear in PRD but with updated figures | Phys. Rev. D 99, 024033 (2019) | 10.1103/PhysRevD.99.024033 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In general relativity the parallel transfer of a vector around a closed curve
in spacetime, or along two curves which together form a closed loop, usually
results in a nonzero deficit angle between the vector's initial and final
positions. We show that such holonomy in the McVittie spacetime, which
represents a gravitating object imbedded in an expanding universe, can in
principle be used to directly detect the expansion of the universe, for example
by measuring changes in the components of a gyroscopic spin axis. Although such
changes are of course small, they are large enough (\D S \sim 10^{-7}) that
they could conceivably be measured if the real universe behaved like the
McVittie spacetime. The real problem is that virialization will lead to domains
decoupled from the global expansion on a scale much larger than that of the
solar system, making such an experiment infeasible probably even in principle.
Nevertheless the effect is of interest in relation to ongoing discussions,
dating back at least to Einstein and Straus, which concern the relationship
between the expansion of the universe and local systems.
| [
{
"created": "Wed, 8 Aug 2018 23:22:50 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Aug 2018 15:39:48 GMT",
"version": "v2"
},
{
"created": "Sun, 16 Sep 2018 11:54:56 GMT",
"version": "v3"
},
{
"created": "Thu, 10 Jan 2019 14:48:35 GMT",
"version": "v4"
}
] | 2019-01-30 | [
[
"Rothman",
"Tony",
""
],
[
"Campbell",
"Mariam",
""
],
[
"Goswami",
"Rituparno",
""
],
[
"Ellis",
"George F. R.",
""
]
] | In general relativity the parallel transfer of a vector around a closed curve in spacetime, or along two curves which together form a closed loop, usually results in a nonzero deficit angle between the vector's initial and final positions. We show that such holonomy in the McVittie spacetime, which represents a gravitating object imbedded in an expanding universe, can in principle be used to directly detect the expansion of the universe, for example by measuring changes in the components of a gyroscopic spin axis. Although such changes are of course small, they are large enough (\D S \sim 10^{-7}) that they could conceivably be measured if the real universe behaved like the McVittie spacetime. The real problem is that virialization will lead to domains decoupled from the global expansion on a scale much larger than that of the solar system, making such an experiment infeasible probably even in principle. Nevertheless the effect is of interest in relation to ongoing discussions, dating back at least to Einstein and Straus, which concern the relationship between the expansion of the universe and local systems. |
hep-ph/9701203 | Salman Habib | Fred Cooper | From Landau's Hydrodynamical Model to Field Theory Models of
Multiparticle Production: A Tribute to Peter Carruthers on his 61st Birthday | 13 pages (14 figures), RevTeX (plus macro), uses epsf. CARRUTHERS61 | null | null | LA-UR-96-4514 | hep-ph | null | We review the assumptions and domain of applicability of Landau's
Hydrodynamical Model. By considering two models of particle production, pair
production from strong electric fields and particle production in the linear
sigma model, we demonstrate that many of Landau's ideas are verified in
explicit field theory calculations.
| [
{
"created": "Thu, 2 Jan 1997 18:20:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cooper",
"Fred",
""
]
] | We review the assumptions and domain of applicability of Landau's Hydrodynamical Model. By considering two models of particle production, pair production from strong electric fields and particle production in the linear sigma model, we demonstrate that many of Landau's ideas are verified in explicit field theory calculations. |
hep-th/0309056 | Sever Amit | Amit Giveon, Anatoly Konechny, Ari Pakman, Amit Sever | Type 0 Strings in a 2-d Black Hole | 33 pages, harvmac. v2: minor clarification added | JHEP 0310 (2003) 025 | 10.1088/1126-6708/2003/10/025 | RI-08-03 | hep-th | null | We study some aspects of type 0 strings propagating in the two dimensional
black hole geometry, corresponding to the exact SL(2)/U(1) SCFT background.
| [
{
"created": "Thu, 4 Sep 2003 15:36:29 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Sep 2003 10:31:40 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Giveon",
"Amit",
""
],
[
"Konechny",
"Anatoly",
""
],
[
"Pakman",
"Ari",
""
],
[
"Sever",
"Amit",
""
]
] | We study some aspects of type 0 strings propagating in the two dimensional black hole geometry, corresponding to the exact SL(2)/U(1) SCFT background. |
gr-qc/0011096 | Jose A. Font | F. Siebel, J.A. Font, E. Mueller (MPA, Garching), P. Papadopoulos
(Portsmouth) | Characteristic numerical relativity applied to hydrodynamic studies of
neutron stars | 10 pages, 6 figures, to appear in the proceedings (electronic
version) of the Marcel Grossmann Meeting (MG9) | null | null | null | gr-qc astro-ph | null | We present tests and results of a new axisymmetric, fully general
relativistic code capable of solving the coupled Einstein-matter system for a
perfect fluid matter field. Our implementation is based on the Bondi metric, by
which the spacetime is foliated with a family of outgoing light cones. We use
high-resolution shock-capturing schemes to solve the fluid equations. The code
can accurately maintain long-term stability of a spherically symmetric,
relativistic, polytropic equilibrium model of a neutron star. In axisymmetry,
we demonstrate global energy conservation of a perturbed neutron star in a
compactified spacetime, for which the total energy radiated away by
gravitational waves corresponds to a significant fraction of the Bondi mass.
| [
{
"created": "Mon, 27 Nov 2000 13:53:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Siebel",
"F.",
"",
"MPA, Garching"
],
[
"Font",
"J. A.",
"",
"MPA, Garching"
],
[
"Mueller",
"E.",
"",
"MPA, Garching"
],
[
"Papadopoulos",
"P.",
"",
"Portsmouth"
]
] | We present tests and results of a new axisymmetric, fully general relativistic code capable of solving the coupled Einstein-matter system for a perfect fluid matter field. Our implementation is based on the Bondi metric, by which the spacetime is foliated with a family of outgoing light cones. We use high-resolution shock-capturing schemes to solve the fluid equations. The code can accurately maintain long-term stability of a spherically symmetric, relativistic, polytropic equilibrium model of a neutron star. In axisymmetry, we demonstrate global energy conservation of a perturbed neutron star in a compactified spacetime, for which the total energy radiated away by gravitational waves corresponds to a significant fraction of the Bondi mass. |
hep-ph/0304066 | Hee-Jung Lee | Hee-Jung Lee, Byung-Yoon Park, Mannque Rho, Vicente Vento | Sliding Vacua in Dense Skyrmion Matter | 23 pages, 8 figures | Nucl.Phys. A726 (2003) 69-92 | 10.1016/S0375-9474(03)01626-9 | KIAS-P03026 | hep-ph nucl-th | null | In continuation of our systematic effort to understand hadronic matter at
high density, we study dense skyrmion matter and its chiral phase structure in
an effective field theory implemented with the trace anomaly of QCD applicable
in the large $N_c$ limit. By incorporating a dilaton field $\chi$ associated
with broken conformal symmetry of QCD into the simplest form of skyrmion
Lagrangian, we simulate the effect of "sliding vacua" influenced by the
presence of matter and obtain what could correspond to the ``intrinsic
dependence" on the background of the system, i.e., matter density or
temperature, that results when a generic chiral effective field theory of
strong interactions is matched to QCD at a matching scale near the chiral scale
$\Lambda_\chi \sim 4\pi f_\pi\sim 1$ GeV. The properties of the Goldstone pions
and the dilaton scalar near the chiral phase transition are studied by looking
at the pertinent excitations of given quantum numbers on top of a skyrmion
matter and their behavior in the vicinity of the phase transition from
Goldstone mode to Wigner mode characterized by the changeover from the FCC
crystal to the half-skyrmion CC crystal. We recover from the model certain
features that are connected to Brown-Rho scaling and that suggest how to give a
precise meaning to the latter in the framework of an effective field theory
that is matched to QCD .
| [
{
"created": "Mon, 7 Apr 2003 10:45:38 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Lee",
"Hee-Jung",
""
],
[
"Park",
"Byung-Yoon",
""
],
[
"Rho",
"Mannque",
""
],
[
"Vento",
"Vicente",
""
]
] | In continuation of our systematic effort to understand hadronic matter at high density, we study dense skyrmion matter and its chiral phase structure in an effective field theory implemented with the trace anomaly of QCD applicable in the large $N_c$ limit. By incorporating a dilaton field $\chi$ associated with broken conformal symmetry of QCD into the simplest form of skyrmion Lagrangian, we simulate the effect of "sliding vacua" influenced by the presence of matter and obtain what could correspond to the ``intrinsic dependence" on the background of the system, i.e., matter density or temperature, that results when a generic chiral effective field theory of strong interactions is matched to QCD at a matching scale near the chiral scale $\Lambda_\chi \sim 4\pi f_\pi\sim 1$ GeV. The properties of the Goldstone pions and the dilaton scalar near the chiral phase transition are studied by looking at the pertinent excitations of given quantum numbers on top of a skyrmion matter and their behavior in the vicinity of the phase transition from Goldstone mode to Wigner mode characterized by the changeover from the FCC crystal to the half-skyrmion CC crystal. We recover from the model certain features that are connected to Brown-Rho scaling and that suggest how to give a precise meaning to the latter in the framework of an effective field theory that is matched to QCD . |
2407.06731 | Juan Rojo | Juan Rojo | Deep-Inelastic Scattering with LHC Neutrinos | 6 pages, 3 figures, to appear in the proceedings of the 31st
International Workshop on Deep Inelastic Scattering (DIS2024), 8-12 April
2024, Grenoble, France | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The observation of neutrinos produced in LHC collisions by the far-forward
FASER and SND@LHC experiments in 2023 herald the new era of collider neutrino
physics. These high-intensity forward neutrino fluxes from proton-proton LHC
collisions enable novel opportunities in QCD, neutrino physics, BSM searches,
and astroparticle physics. In this contribution, we briefly review the physics
potential of neutrino deep-inelastic scattering (DIS) measurements at the LHC
to shed light on proton and nuclear structure, both for ongoing far-forward
experiments and for the proposed Forward Physics Facility (FPF) to operate
concurrently with the HL-LHC. We consider the reach of LHC neutrino DIS to
scrutinise the mechanisms of forward hadron production and constrain QCD in the
ultra-small-$x$ region. We also discuss how neutrino DIS measurements at these
far-forward detectors enhance direct and indirect BSM searches at the HL-LHC.
| [
{
"created": "Tue, 9 Jul 2024 10:20:12 GMT",
"version": "v1"
}
] | 2024-07-10 | [
[
"Rojo",
"Juan",
""
]
] | The observation of neutrinos produced in LHC collisions by the far-forward FASER and SND@LHC experiments in 2023 herald the new era of collider neutrino physics. These high-intensity forward neutrino fluxes from proton-proton LHC collisions enable novel opportunities in QCD, neutrino physics, BSM searches, and astroparticle physics. In this contribution, we briefly review the physics potential of neutrino deep-inelastic scattering (DIS) measurements at the LHC to shed light on proton and nuclear structure, both for ongoing far-forward experiments and for the proposed Forward Physics Facility (FPF) to operate concurrently with the HL-LHC. We consider the reach of LHC neutrino DIS to scrutinise the mechanisms of forward hadron production and constrain QCD in the ultra-small-$x$ region. We also discuss how neutrino DIS measurements at these far-forward detectors enhance direct and indirect BSM searches at the HL-LHC. |
2012.04694 | Salah Nasri | Hemza Azri and Salah Nasri | Scalar-Connection Gravity and Spontaneous Scalarization | null | Phys. Rev. D 103, 024035 (2021) | 10.1103/PhysRevD.103.024035 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scalar-tensor theories of gravity are known to allow significant deviations
from general relativity through various astrophysical phenomena. In this paper,
we formulate a scalar-connection gravity by setting up scalars and connection
configurations instead of metric. Since the matter sector is not
straightforward to conceive without a metric, we invoke cosmological fluids in
terms of their one-form velocity in the volume element of the invariant action.
This leads to gravitational equations with a perfect fluid source and a
generated metric, which are expected to produce reasonable deviations from
general relativity in the strong-field regime. As a relevant application, we
study spontaneous scalarization mechanism and show that the
Damour-Esposito-Far\`{e}se model arises in a certain class of scalar-connection
gravity. Furthermore, we investigate a general study in which the present
framework becomes distinguishable from the famed scalar-tensor theories.
| [
{
"created": "Tue, 8 Dec 2020 19:28:00 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jan 2021 17:28:46 GMT",
"version": "v2"
}
] | 2021-01-21 | [
[
"Azri",
"Hemza",
""
],
[
"Nasri",
"Salah",
""
]
] | Scalar-tensor theories of gravity are known to allow significant deviations from general relativity through various astrophysical phenomena. In this paper, we formulate a scalar-connection gravity by setting up scalars and connection configurations instead of metric. Since the matter sector is not straightforward to conceive without a metric, we invoke cosmological fluids in terms of their one-form velocity in the volume element of the invariant action. This leads to gravitational equations with a perfect fluid source and a generated metric, which are expected to produce reasonable deviations from general relativity in the strong-field regime. As a relevant application, we study spontaneous scalarization mechanism and show that the Damour-Esposito-Far\`{e}se model arises in a certain class of scalar-connection gravity. Furthermore, we investigate a general study in which the present framework becomes distinguishable from the famed scalar-tensor theories. |
1510.00589 | Alexander Prygarin | S. Bondarenko and A. Prygarin | Hermitian separability and transition from singlet to adjoint BFKL
equations in $\mathcal{N}=4$ super Yang-Mills Theory | 14 pages | null | null | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the next-to-leading order~(NLO) correction to the eigenvalue of
the BFKL equation in the adjoint representation and investigate its properties
in analogy with the singlet BFKL in planar $\mathcal{N}=4$ super Yang-Mills
Theory~(SYM). We show that the adjoint NLO BFKL eigenvalue is needed to be
slightly modified in order to have a property of hermitian separability present
for the singlet BFKL. After this modification the adjoint NLO BFKL eigenvalue
is expressed through holomorphic and antiholomophic parts of the leading order
eigenvalue and their derivatives. The proposed choice of the modified NLO
expression is supported by the fact that it is possible to obtain the same
result in a relatively straightforward way directly from the singlet NLO BFKL
eigenvalue replacing alternating sums by non-alternating ones. This
transformation corresponds to changing cylindrical topology of the singlet BFKL
to the planar topology of the adjoint BFKL. We believe that the original NLO
calculation of Fadin and Lipatov is correct and valid for the computations of
the remainder function of the BDS amplitude. However, the notion of the adjoint
BFKL eigenvalue is vaguely defined due to removal of the infrared divergences
as well as redistributing NLO corrections between the kernel and impact
factors, and is to be modified to comply with properties of the singlet BFKL
equation. This, at first sight, a purely semantic difference may become
important in resolving the issue of the non-vanishing adjoint NNLO eigenvalue
in the limit of zero anomalous dimension $\nu$ and conformal spin $n$, which
contradicts the bootstrap condition of the BFKL equation.
| [
{
"created": "Fri, 2 Oct 2015 13:24:09 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Oct 2015 18:21:48 GMT",
"version": "v2"
}
] | 2015-10-27 | [
[
"Bondarenko",
"S.",
""
],
[
"Prygarin",
"A.",
""
]
] | We revisit the next-to-leading order~(NLO) correction to the eigenvalue of the BFKL equation in the adjoint representation and investigate its properties in analogy with the singlet BFKL in planar $\mathcal{N}=4$ super Yang-Mills Theory~(SYM). We show that the adjoint NLO BFKL eigenvalue is needed to be slightly modified in order to have a property of hermitian separability present for the singlet BFKL. After this modification the adjoint NLO BFKL eigenvalue is expressed through holomorphic and antiholomophic parts of the leading order eigenvalue and their derivatives. The proposed choice of the modified NLO expression is supported by the fact that it is possible to obtain the same result in a relatively straightforward way directly from the singlet NLO BFKL eigenvalue replacing alternating sums by non-alternating ones. This transformation corresponds to changing cylindrical topology of the singlet BFKL to the planar topology of the adjoint BFKL. We believe that the original NLO calculation of Fadin and Lipatov is correct and valid for the computations of the remainder function of the BDS amplitude. However, the notion of the adjoint BFKL eigenvalue is vaguely defined due to removal of the infrared divergences as well as redistributing NLO corrections between the kernel and impact factors, and is to be modified to comply with properties of the singlet BFKL equation. This, at first sight, a purely semantic difference may become important in resolving the issue of the non-vanishing adjoint NNLO eigenvalue in the limit of zero anomalous dimension $\nu$ and conformal spin $n$, which contradicts the bootstrap condition of the BFKL equation. |
0710.0974 | Sunandan Gangopadhyay | Sunandan Gangopadhyay, Shailesh Kulkarni | Hawking radiation in GHS and non-extremal D1-D5 blackhole via covariant
anomalies | 8 pages latex file | Phys.Rev.D77:024038,2008 | 10.1103/PhysRevD.77.024038 | null | hep-th | null | We apply the method of Banerjee and Kulkarni (arXiv:0707.2449, [hep-th]) to
provide a derivation of Hawking radiation from the GHS (stringy) blackhole
which falls in the class of the most general spherically symmetric blackholes
($\sqrt{-g}\neq 1$) and also the non-extremal $D1-D5$ blackhole using only
covariant gravitational anomalies.
| [
{
"created": "Thu, 4 Oct 2007 10:26:44 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Gangopadhyay",
"Sunandan",
""
],
[
"Kulkarni",
"Shailesh",
""
]
] | We apply the method of Banerjee and Kulkarni (arXiv:0707.2449, [hep-th]) to provide a derivation of Hawking radiation from the GHS (stringy) blackhole which falls in the class of the most general spherically symmetric blackholes ($\sqrt{-g}\neq 1$) and also the non-extremal $D1-D5$ blackhole using only covariant gravitational anomalies. |
1605.04921 | Gustavo Brito | Antonio Accioly, Jos\'e Helay\"el-Neto, Gilson Correia, Gustavo Brito,
Jos\'e de Almeida, Wallace Herdy | Interparticle potential energy for D-dimensional electromagnetic models
from the corresponding scalar ones | null | Phys. Rev. D 93, 105042 (2016) | 10.1103/PhysRevD.93.105042 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a method based on the generating functional plus a kind of
"correspondence principle" --- which acts as a bridge between the
electromagnetic and scalar fields --- it is shown that the interparticle
potential energy concerning a given $D$-dimensional electromagnetic model can
be obtained in a simple way from that related to the corresponding scalar
system. The $D$-dimensional electromagnetic potential for a general model
containing higher derivatives is then found from the corresponding scalar one
and the behavior of the former is analyzed at large as well as small distances.
In addition, we investigate the presence of ghosts in the four-dimensional
version of the potential associated with the model above and analyze the reason
why the Coulomb singularity is absent from this system. The no-go theorem by
Ostrogradski is demystified as well.
| [
{
"created": "Mon, 16 May 2016 20:01:17 GMT",
"version": "v1"
}
] | 2016-06-22 | [
[
"Accioly",
"Antonio",
""
],
[
"Helayël-Neto",
"José",
""
],
[
"Correia",
"Gilson",
""
],
[
"Brito",
"Gustavo",
""
],
[
"de Almeida",
"José",
""
],
[
"Herdy",
"Wallace",
""
]
] | Using a method based on the generating functional plus a kind of "correspondence principle" --- which acts as a bridge between the electromagnetic and scalar fields --- it is shown that the interparticle potential energy concerning a given $D$-dimensional electromagnetic model can be obtained in a simple way from that related to the corresponding scalar system. The $D$-dimensional electromagnetic potential for a general model containing higher derivatives is then found from the corresponding scalar one and the behavior of the former is analyzed at large as well as small distances. In addition, we investigate the presence of ghosts in the four-dimensional version of the potential associated with the model above and analyze the reason why the Coulomb singularity is absent from this system. The no-go theorem by Ostrogradski is demystified as well. |
0809.3464 | Peter Freund | Peter G.O. Freund | Dynamical Spin II | Contribution to "Fundamental Interactions - A Memorial Volume for
Wolfgang Kummer", World Scientific, to be published | null | null | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possibility of building all particles from spinless constituents is
explored. Composite fermions are formed from bosonic carriers of electric and
magnetic charge of a composite abelian gauge field. Internal attributes are
accounted for by dimensional reduction from a higher-dimensional space-time in
which the abelian gauge field is replaced by a composite higher-rank
antisymmetric tensor field. The problem of building magnetically neutral
fermions is considered.
| [
{
"created": "Fri, 19 Sep 2008 21:25:34 GMT",
"version": "v1"
}
] | 2008-09-23 | [
[
"Freund",
"Peter G. O.",
""
]
] | The possibility of building all particles from spinless constituents is explored. Composite fermions are formed from bosonic carriers of electric and magnetic charge of a composite abelian gauge field. Internal attributes are accounted for by dimensional reduction from a higher-dimensional space-time in which the abelian gauge field is replaced by a composite higher-rank antisymmetric tensor field. The problem of building magnetically neutral fermions is considered. |
gr-qc/0604039 | Masakatsu Kenmoku | Masakatsu Kenmoku and Yuki Kobayashi | Generalized Area Law under Multi-parameter Rotating Black Hole Spacetime | 27 pages, no figures | Class.Quant.Grav.23:6257-6274,2006 | 10.1088/0264-9381/23/22/012 | null | gr-qc | null | We study the statistical mechanics for quantum scalar fields under the
multi-parameter rotating black hole spacetime in arbitrary D dimensions. The
method of analysis is general in the sense that the metric does not depend on
the explicit black hole solutions. The generalized Stefan-Boltzmann's law for
the scalar field is derived by considering the allowed energy region properly.
Then the generalized area law for the scalar field entropy is derived by
introducing the invariant regularization parameter in the Rindler spacetime.
The derived area law is applied to Kerr-AdS black holes in four and five
dimensions. Thermodynamic implication is also discussed.
| [
{
"created": "Mon, 10 Apr 2006 07:14:28 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Kenmoku",
"Masakatsu",
""
],
[
"Kobayashi",
"Yuki",
""
]
] | We study the statistical mechanics for quantum scalar fields under the multi-parameter rotating black hole spacetime in arbitrary D dimensions. The method of analysis is general in the sense that the metric does not depend on the explicit black hole solutions. The generalized Stefan-Boltzmann's law for the scalar field is derived by considering the allowed energy region properly. Then the generalized area law for the scalar field entropy is derived by introducing the invariant regularization parameter in the Rindler spacetime. The derived area law is applied to Kerr-AdS black holes in four and five dimensions. Thermodynamic implication is also discussed. |
hep-th/0702017 | Matthias Schmidt | J. Huebschmann, G. Rudolph, M. Schmidt | A gauge model for quantum mechanics on a stratified space | 38 pages, 9 figures. Changes: comments on the heat kernel and
coherent states have been added | Commun.Math.Phys.286:459-494,2009 | 10.1007/s00220-008-0693-0 | null | hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Hamiltonian approach on a single spatial plaquette, we construct a
quantum (lattice) gauge theory which incorporates the classical singularities.
The reduced phase space is a stratified K\"ahler space, and we make explicit
the requisite singular holomorphic quantization procedure on this space. On the
quantum level, this procedure furnishes a costratified Hilbert space, that is,
a Hilbert space together with a system which consists of the subspaces
associated with the strata of the reduced phase space and of the corresponding
orthoprojectors. The costratified Hilbert space structure reflects the
stratification of the reduced phase space. For the special case where the
structure group is $\mathrm{SU}(2)$, we discuss the tunneling probabilities
between the strata, determine the energy eigenstates and study the
corresponding expectation values of the orthoprojectors onto the subspaces
associated with the strata in the strong and weak coupling approximations.
| [
{
"created": "Fri, 2 Feb 2007 15:55:37 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Mar 2007 13:46:40 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Nov 2008 10:56:22 GMT",
"version": "v3"
}
] | 2009-01-30 | [
[
"Huebschmann",
"J.",
""
],
[
"Rudolph",
"G.",
""
],
[
"Schmidt",
"M.",
""
]
] | In the Hamiltonian approach on a single spatial plaquette, we construct a quantum (lattice) gauge theory which incorporates the classical singularities. The reduced phase space is a stratified K\"ahler space, and we make explicit the requisite singular holomorphic quantization procedure on this space. On the quantum level, this procedure furnishes a costratified Hilbert space, that is, a Hilbert space together with a system which consists of the subspaces associated with the strata of the reduced phase space and of the corresponding orthoprojectors. The costratified Hilbert space structure reflects the stratification of the reduced phase space. For the special case where the structure group is $\mathrm{SU}(2)$, we discuss the tunneling probabilities between the strata, determine the energy eigenstates and study the corresponding expectation values of the orthoprojectors onto the subspaces associated with the strata in the strong and weak coupling approximations. |
1912.07587 | Fabrizio Rompineve | Benedict von Harling, Alex Pomarol, Oriol Pujolas and Fabrizio
Rompineve | Peccei-Quinn Phase Transition at LIGO | 27 pages, 7 figure. v2: references added | null | 10.1007/JHEP04(2020)195 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The LIGO observatories can potentially detect stochastic gravitational waves
arising from phase transitions which happened in the early universe at
temperatures around $T\sim 10^{8}$ GeV. This provides an extraordinary
opportunity for discovering the phase transition associated with the breaking
of the Peccei-Quinn symmetry, required in QCD axion models. Here we consider
the simplest Peccei-Quinn models and study under which conditions a strong
first-order phase transition can occur, analyzing its associated gravitational
wave signal. To be detectable at LIGO, we show that some supercooling is
needed, which can arise either in Coleman-Weinberg-type symmetry breaking or in
strongly-coupled models. We also investigate phase transitions that
interestingly proceed by first breaking the electroweak symmetry at large
scales before tunneling to the Peccei-Quinn breaking vacuum. In this case, the
associated gravitational wave signal is more likely to be probed at the
proposed Einstein Telescope.
| [
{
"created": "Mon, 16 Dec 2019 18:57:10 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Apr 2020 15:39:40 GMT",
"version": "v2"
}
] | 2020-05-20 | [
[
"von Harling",
"Benedict",
""
],
[
"Pomarol",
"Alex",
""
],
[
"Pujolas",
"Oriol",
""
],
[
"Rompineve",
"Fabrizio",
""
]
] | The LIGO observatories can potentially detect stochastic gravitational waves arising from phase transitions which happened in the early universe at temperatures around $T\sim 10^{8}$ GeV. This provides an extraordinary opportunity for discovering the phase transition associated with the breaking of the Peccei-Quinn symmetry, required in QCD axion models. Here we consider the simplest Peccei-Quinn models and study under which conditions a strong first-order phase transition can occur, analyzing its associated gravitational wave signal. To be detectable at LIGO, we show that some supercooling is needed, which can arise either in Coleman-Weinberg-type symmetry breaking or in strongly-coupled models. We also investigate phase transitions that interestingly proceed by first breaking the electroweak symmetry at large scales before tunneling to the Peccei-Quinn breaking vacuum. In this case, the associated gravitational wave signal is more likely to be probed at the proposed Einstein Telescope. |
gr-qc/0312086 | Daniel Grumiller | H. Balasin and D. Grumiller | The ultrarelativistic limit of 2D dilaton gravity and its energy
momentum tensor | 20 pages, 3 eps-figures, v4: corrected typo in affiliation and 2
misprints in the text, added PACS numbers | Class.Quant.Grav. 21 (2004) 2859-2872 | 10.1088/0264-9381/21/12/006 | TUW-03-26, ESI 1423 | gr-qc hep-th | null | The ultrarelativistic limit of twodimensional dilaton gravity is presented
and its associated (anti-)selfdual energy momentum tensor is derived. It is
localized on a null line, although the line element remains twice
differentiable. Relations to the Aichelburg-Sexl spacetime and constant dilaton
vacua are pointed out. Geodesics are found to be smooth for minimally coupled
test particles but non-smooth -- with a finite jump in the acceleration -- for
test particles coupled non-minimally to the dilaton. Quantization on boosted
backgrounds is discussed; no anomalous trace of the energy momentum tensor
arises and the 1-loop flux component can be adjusted to be equal to the
classical flux of the shock wave.
| [
{
"created": "Thu, 18 Dec 2003 16:16:13 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Dec 2003 14:59:50 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Apr 2004 17:24:30 GMT",
"version": "v3"
},
{
"created": "Mon, 19 Apr 2004 13:40:00 GMT",
"version": "v4"
}
] | 2009-11-10 | [
[
"Balasin",
"H.",
""
],
[
"Grumiller",
"D.",
""
]
] | The ultrarelativistic limit of twodimensional dilaton gravity is presented and its associated (anti-)selfdual energy momentum tensor is derived. It is localized on a null line, although the line element remains twice differentiable. Relations to the Aichelburg-Sexl spacetime and constant dilaton vacua are pointed out. Geodesics are found to be smooth for minimally coupled test particles but non-smooth -- with a finite jump in the acceleration -- for test particles coupled non-minimally to the dilaton. Quantization on boosted backgrounds is discussed; no anomalous trace of the energy momentum tensor arises and the 1-loop flux component can be adjusted to be equal to the classical flux of the shock wave. |
hep-th/0404171 | Michael Volkov | Ali H. Chamseddine and Mikhail S. Volkov | Regular non-Abelian vacua in ${\cal N}=4$, SO(4) gauged supergravity | 9 pages, 2 fugures | Phys.Rev. D70 (2004) 086007 | 10.1103/PhysRevD.70.086007 | null | hep-th | null | We present a family of globally regular ${\cal N}=1$ vacua in the D=4, ${\cal
N}=4$ gauged supergravity of Gates and Zwiebach. These solutions are labeled by
the ratio $\xi$ of the two gauge couplings, and for $\xi=0$ they reduce to the
supergravity monopole previously used for constructing the gravity dual of
${\cal N}=1$ super Yang-Mills theory. For $\xi>0$ the solutions are
asymptotically anti de Sitter, but with an excess of the solid angle, and they
reduce exactly to anti de Sitter for $\xi=1$. Solutions with $\xi<0$ are
topologically $R^1\times S^3$, and for $\xi=-2$ they become $R^1\times S^3$
geometrically. All solutions with $\xi\neq 0$ can be promoted to D=11 to become
vacua of M-theory.
| [
{
"created": "Thu, 22 Apr 2004 14:30:40 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Chamseddine",
"Ali H.",
""
],
[
"Volkov",
"Mikhail S.",
""
]
] | We present a family of globally regular ${\cal N}=1$ vacua in the D=4, ${\cal N}=4$ gauged supergravity of Gates and Zwiebach. These solutions are labeled by the ratio $\xi$ of the two gauge couplings, and for $\xi=0$ they reduce to the supergravity monopole previously used for constructing the gravity dual of ${\cal N}=1$ super Yang-Mills theory. For $\xi>0$ the solutions are asymptotically anti de Sitter, but with an excess of the solid angle, and they reduce exactly to anti de Sitter for $\xi=1$. Solutions with $\xi<0$ are topologically $R^1\times S^3$, and for $\xi=-2$ they become $R^1\times S^3$ geometrically. All solutions with $\xi\neq 0$ can be promoted to D=11 to become vacua of M-theory. |
0808.1559 | Katanaev | M.O.Katanaev | Global solutions in gravity. Euclidean signature | 16 pages, 6 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a wide class of two-dimensional metrics having one Killing
vector. The method is proposed for the construction of maximally extended
surfaces with the given Riemannian metric which is the analog of the conformal
block method for two-dimensional Lorentzian signature metrics. The
Schwarzschild solution is considered as an example.
| [
{
"created": "Mon, 11 Aug 2008 19:12:35 GMT",
"version": "v1"
}
] | 2008-08-12 | [
[
"Katanaev",
"M. O.",
""
]
] | We consider a wide class of two-dimensional metrics having one Killing vector. The method is proposed for the construction of maximally extended surfaces with the given Riemannian metric which is the analog of the conformal block method for two-dimensional Lorentzian signature metrics. The Schwarzschild solution is considered as an example. |
hep-th/9705089 | Detlev Buchholz | D. Buchholz, S. Doplicher, G. Morchio, J.E. Roberts, F. Strocchi | A model for charges of electromagnetic type | 14 pages, Amstex | "Operator Algebras and Quantum Field Theory", pp. 647-660,
Proceedings Rome 1996, International Press 1997 | null | null | hep-th | null | We discuss a simple but instructive model in which Gauss' law holds for a
class of charged states. In spite of the non-localizability of these charges,
the corresponding superselection sectors can be labelled by the spectrum of
some internal symmetry group and have well defined statistics. More
interestingly, the properties of these charged states seem to point to a
general argument allowing one to establish these features for any theory with
charges of electric or magnetic type.
| [
{
"created": "Tue, 13 May 1997 18:58:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Buchholz",
"D.",
""
],
[
"Doplicher",
"S.",
""
],
[
"Morchio",
"G.",
""
],
[
"Roberts",
"J. E.",
""
],
[
"Strocchi",
"F.",
""
]
] | We discuss a simple but instructive model in which Gauss' law holds for a class of charged states. In spite of the non-localizability of these charges, the corresponding superselection sectors can be labelled by the spectrum of some internal symmetry group and have well defined statistics. More interestingly, the properties of these charged states seem to point to a general argument allowing one to establish these features for any theory with charges of electric or magnetic type. |
hep-ph/0310279 | Feng Yuan | Feng Yuan | The Beam Single Spin Asymmetry in Semi-inclusive Deep Inelastic
Scattering | 8 pages, 2 PS figures | Phys.Lett. B589 (2004) 28-34 | 10.1016/j.physletb.2004.03.040 | DOE/ER/40762-297, UM-PP#04-006 | hep-ph | null | We study the beam single spin asymmetry in semi-inclusive hadron production
in deep inelastic scattering in at order 1/Q. There are two competing
contributions: the leading order transverse momentum dependent parton
distribution $h_1^\perp(x,k_\perp)$ convoluted with chiral-odd fragmentation
function $\hat e(z)$, and the chiral-odd distribution function $e(x)$
convoluted with Collins fragmentation function $H_1^\perp(z,k'_\perp)$. We
estimate this asymmetry and compare with the experimental measurements from
CLAS and HERMES collaborations.
| [
{
"created": "Thu, 23 Oct 2003 19:45:40 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Yuan",
"Feng",
""
]
] | We study the beam single spin asymmetry in semi-inclusive hadron production in deep inelastic scattering in at order 1/Q. There are two competing contributions: the leading order transverse momentum dependent parton distribution $h_1^\perp(x,k_\perp)$ convoluted with chiral-odd fragmentation function $\hat e(z)$, and the chiral-odd distribution function $e(x)$ convoluted with Collins fragmentation function $H_1^\perp(z,k'_\perp)$. We estimate this asymmetry and compare with the experimental measurements from CLAS and HERMES collaborations. |
hep-th/0403184 | Ricardo Renan Landim | Marcio A. M. Gomes and R. R. Landim | Linking number from a topologically massive p-form theory | 08 pages, changed contents | null | null | null | hep-th | null | We show that the linking number of two homologically trivial disjoint $p$ and
$(D-p-1)$-dimensional submanifolds of a $D$-dimensional manifold can be derived
from the topologically massive $BC$ theory in low energy regime.
| [
{
"created": "Thu, 18 Mar 2004 14:19:49 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Sep 2004 20:37:21 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Mar 2005 15:08:10 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Gomes",
"Marcio A. M.",
""
],
[
"Landim",
"R. R.",
""
]
] | We show that the linking number of two homologically trivial disjoint $p$ and $(D-p-1)$-dimensional submanifolds of a $D$-dimensional manifold can be derived from the topologically massive $BC$ theory in low energy regime. |
1912.05463 | Carlo Maccaferri | Harold Erbin, Carlo Maccaferri, Jakub Vo\v{s}mera | Localization of effective actions in Heterotic String Field Theory | 48 pages incl. appendix. V2: ref added and minor improvements | JHEP 02(2020)059 | 10.1007/JHEP02(2020)059 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the algebraic couplings in the tree level effective action of the
heterotic string. We show how these couplings can be computed from closed
string field theory. When the light fields we are interested in are charged
under an underlying ${\mathcal N}=2$ $R$-charge in the left-moving sector,
their quartic effective potential localizes at the boundary of the worldsheet
moduli space, in complete analogy to the previously studied open string case.
In particular we are able to compute the quartic closed string field theory
potential without resorting to any explicit expression for the 3- and the
4-strings vertices but only using the $L_\infty$ relations between them. As a
non trivial example we show how the heterotic Yang-Mills quartic potential
arises in this way.
| [
{
"created": "Wed, 11 Dec 2019 17:01:52 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Feb 2020 22:08:02 GMT",
"version": "v2"
}
] | 2020-03-18 | [
[
"Erbin",
"Harold",
""
],
[
"Maccaferri",
"Carlo",
""
],
[
"Vošmera",
"Jakub",
""
]
] | We consider the algebraic couplings in the tree level effective action of the heterotic string. We show how these couplings can be computed from closed string field theory. When the light fields we are interested in are charged under an underlying ${\mathcal N}=2$ $R$-charge in the left-moving sector, their quartic effective potential localizes at the boundary of the worldsheet moduli space, in complete analogy to the previously studied open string case. In particular we are able to compute the quartic closed string field theory potential without resorting to any explicit expression for the 3- and the 4-strings vertices but only using the $L_\infty$ relations between them. As a non trivial example we show how the heterotic Yang-Mills quartic potential arises in this way. |
hep-ph/9407399 | Markus Diehl | M. Diehl | Diffractive production of dijets at HERA | 32 pages, uuencoded postscript file, DAMTP-94-60. Some comparison
with work by other authors added (changes on page 12, in the conclusions and
in the references) | Z.Phys.C66:181-194,1995 | 10.1007/BF01496592 | null | hep-ph | null | We investigate the production of a quark-antiquark pair in diffractive
photon- proton scattering, approximating soft pomeron exchange by the exchange
of two nonperturbative gluons. In deep inelastic scattering at HERA, events
with two jets and the scattered proton in the final state are predicted to be
observa- ble, with an important contribution from charm production. For
photoproduction of light quark jets with high transverse momentum we find that
both exchanged gluons must have a large invariant mass, so that the cross
section is very small, whereas for charm quarks it is quite appreciable. From
our calculation we also extract the quark structure function of the pomeron for
the scaling variable $z$ no too close to 0 or 1, finding a strong flavour
dependence and a behaviour somewhat harder than $z (1-z)$ for light quarks.
| [
{
"created": "Fri, 29 Jul 1994 11:25:36 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Aug 1994 16:46:28 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Diehl",
"M.",
""
]
] | We investigate the production of a quark-antiquark pair in diffractive photon- proton scattering, approximating soft pomeron exchange by the exchange of two nonperturbative gluons. In deep inelastic scattering at HERA, events with two jets and the scattered proton in the final state are predicted to be observa- ble, with an important contribution from charm production. For photoproduction of light quark jets with high transverse momentum we find that both exchanged gluons must have a large invariant mass, so that the cross section is very small, whereas for charm quarks it is quite appreciable. From our calculation we also extract the quark structure function of the pomeron for the scaling variable $z$ no too close to 0 or 1, finding a strong flavour dependence and a behaviour somewhat harder than $z (1-z)$ for light quarks. |
hep-ph/9807326 | Ken-ichi Hikasa | Keiji Igi and Ken-ichi Hikasa | Another look at $\pi\pi$ scattering in the scalar channel | 17 pages, 5 figures, REVTeX | Phys.Rev.D59:034005,1999 | 10.1103/PhysRevD.59.034005 | TU-552, RCNS-98-12, KNGU-INFO-PH-1 | hep-ph | null | We set up a general framework to describe $\pi\pi$ scattering below 1 GeV
based on chiral low-energy expansion with possible spin-0 and 1 resonances.
Partial wave amplitudes are obtained with the $N/D$ method, which satisfy
unitarity, analyticity and approximate crossing symmetry. Comparison with the
phase shift data in the J=0 channel favors a scalar resonance near the $\rho$
mass.
| [
{
"created": "Fri, 10 Jul 1998 09:34:32 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Igi",
"Keiji",
""
],
[
"Hikasa",
"Ken-ichi",
""
]
] | We set up a general framework to describe $\pi\pi$ scattering below 1 GeV based on chiral low-energy expansion with possible spin-0 and 1 resonances. Partial wave amplitudes are obtained with the $N/D$ method, which satisfy unitarity, analyticity and approximate crossing symmetry. Comparison with the phase shift data in the J=0 channel favors a scalar resonance near the $\rho$ mass. |
2210.13946 | Matt Visser | Francisco S. N. Lobo, Jos\'e Pedro Mimoso, Jessica Santiago and Matt
Visser | Dynamical analysis of the redshift drift in FLRW universes | V1: 34 pages, 4 figures. V2: 37 pages, 19 figures. New section added.
V3: Reformatted and edited, now 24 pages. (This version closely resembles the
published version.) | Universe 2024, 10, 162 | 10.3390/universe10040162 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Redshift drift is the phenomenon whereby the observed redshift between an
emitter and observer comoving with the Hubble flow in an expanding FLRW
universe will slowly evolve -- on a timescale comparable to the Hubble time. In
a previous article [JCAP 04 (2020) 043; arXiv 2001.11964] three of the current
authors had performed a cosmographic analysis of the redshift drift in a FLRW
universe, temporarily putting aside the issue of dynamics (the Friedmann
equations). In the current article we now add dynamics, still within the
framework of an exact FLRW universe. We shall develop a suitable generic matter
model and apply it to both standard FLRW and various dark energy models.
Furthermore, we shall also present a section analyzing the utility of using
alternative cosmographic variables to describe the redshift drift data.
| [
{
"created": "Tue, 25 Oct 2022 11:59:02 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Oct 2023 06:56:13 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Apr 2024 01:47:14 GMT",
"version": "v3"
}
] | 2024-04-03 | [
[
"Lobo",
"Francisco S. N.",
""
],
[
"Mimoso",
"José Pedro",
""
],
[
"Santiago",
"Jessica",
""
],
[
"Visser",
"Matt",
""
]
] | Redshift drift is the phenomenon whereby the observed redshift between an emitter and observer comoving with the Hubble flow in an expanding FLRW universe will slowly evolve -- on a timescale comparable to the Hubble time. In a previous article [JCAP 04 (2020) 043; arXiv 2001.11964] three of the current authors had performed a cosmographic analysis of the redshift drift in a FLRW universe, temporarily putting aside the issue of dynamics (the Friedmann equations). In the current article we now add dynamics, still within the framework of an exact FLRW universe. We shall develop a suitable generic matter model and apply it to both standard FLRW and various dark energy models. Furthermore, we shall also present a section analyzing the utility of using alternative cosmographic variables to describe the redshift drift data. |
hep-ph/0009162 | Raymond R. Volkas | R. R. Volkas | Lepton asymmetries from neutrino oscillations | 7 pages, 3 embedded figures, uses espcrc2.sty. Invited talk at
Neutrino 2000 (to appear in the Proceedings) | Nucl.Phys.Proc.Suppl. 91 (2000) 487-493 | 10.1016/S0920-5632(00)00979-8 | null | hep-ph | null | Reasonably large relic neutrino asymmetries can be generated by
active-sterile neutrino oscillations. After briefly discussing possible
applications, I describe the Quantum Kinetic Equation formalism used to compute
the asymmetry growth curves. I then show how the basic features of these curves
can be understood on the basis of the adiabatic limit approximation in the
collision dominated epoch, and the pure MSW effect at lower temperatures.
| [
{
"created": "Thu, 14 Sep 2000 07:28:45 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Volkas",
"R. R.",
""
]
] | Reasonably large relic neutrino asymmetries can be generated by active-sterile neutrino oscillations. After briefly discussing possible applications, I describe the Quantum Kinetic Equation formalism used to compute the asymmetry growth curves. I then show how the basic features of these curves can be understood on the basis of the adiabatic limit approximation in the collision dominated epoch, and the pure MSW effect at lower temperatures. |
hep-th/9403183 | Wolfgang Lerche | W. Lerche and A. Sevrin | On the Landau-Ginzburg Realization of Topological Gravities | 26p, harvmac, 4 uuencoded PostScript figures | Nucl.Phys.B428:259-281,1994 | 10.1016/0550-3213(94)90202-X | CERN-TH.7210/94 | hep-th | null | We study the equivariant cohomology of a class of multi-field topological LG
models, and find that such systems carry intrinsic information about
$W$-gravity. As a result, we can construct the gravitational chiral ring in
terms of LG polynomials. We find, in particular, that the spectrum of such
theories seems to be richer than so far expected. We also briefly discuss the
BRST operator for non-linear topological $W$-gravity.
| [
{
"created": "Wed, 30 Mar 1994 12:19:25 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Lerche",
"W.",
""
],
[
"Sevrin",
"A.",
""
]
] | We study the equivariant cohomology of a class of multi-field topological LG models, and find that such systems carry intrinsic information about $W$-gravity. As a result, we can construct the gravitational chiral ring in terms of LG polynomials. We find, in particular, that the spectrum of such theories seems to be richer than so far expected. We also briefly discuss the BRST operator for non-linear topological $W$-gravity. |
2002.09193 | Daniel Pablos | Jorge Casalderrey-Solana, Guilherme Milhano, Daniel Pablos and Krishna
Rajagopal | Jet substructure modification probes the QGP resolution length | 4 pages, 2 figures, contribution to the Quark Matter 2019 proceedings | null | 10.1016/j.nuclphysa.2020.121904 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show the sensitivity of groomed jet substructure measurements to the
finite resolution power of the QGP to disentangle multiple energetic partons,
as produced by QCD jets, that traverse it simultaneously. We illustrate these
effects by studying Soft Dropped observables within a hybrid strong/weak
coupling model for jet-medium interactions. By analysing Monte-Carlo-generated
jet data in heavy ion collisions, we show that the angular structure of these
type of observables is sensitive to the value of the QGP resolution length.
| [
{
"created": "Fri, 21 Feb 2020 09:20:25 GMT",
"version": "v1"
}
] | 2021-02-03 | [
[
"Casalderrey-Solana",
"Jorge",
""
],
[
"Milhano",
"Guilherme",
""
],
[
"Pablos",
"Daniel",
""
],
[
"Rajagopal",
"Krishna",
""
]
] | We show the sensitivity of groomed jet substructure measurements to the finite resolution power of the QGP to disentangle multiple energetic partons, as produced by QCD jets, that traverse it simultaneously. We illustrate these effects by studying Soft Dropped observables within a hybrid strong/weak coupling model for jet-medium interactions. By analysing Monte-Carlo-generated jet data in heavy ion collisions, we show that the angular structure of these type of observables is sensitive to the value of the QGP resolution length. |
1308.1920 | Daniel Are\'an | Daniel Arean, Arya Farahi, Leopoldo A. Pando Zayas, Ignacio Salazar
Landea, Antonello Scardicchio | A Dirty Holographic Superconductor | 5 pages, 8 figures. v3: discussion improved, references added, typos
corrected, results unchanged | Phys. Rev. D 89, 106003 (2014) | 10.1103/PhysRevD.89.106003 | MCTP-13-22 | hep-th cond-mat.dis-nn cond-mat.supr-con gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effects of disorder on a holographic superconductor by
introducing a random chemical potential on the boundary. We consider various
realizations of disorder and find that the critical temperature for
superconductivity is enhanced. We also present evidence for a precise form of
renormalization in this system. Namely, when the random chemical potential is
characterized by a Fourier spectrum of the form $k^{-2\alpha}$ we find that the
spectra of the condensate and the charge density are again power-laws, whose
exponents are accurately and universally governed by linear functions of
$\alpha$.
| [
{
"created": "Thu, 8 Aug 2013 18:17:41 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Oct 2013 18:53:11 GMT",
"version": "v2"
},
{
"created": "Fri, 20 Jun 2014 14:52:27 GMT",
"version": "v3"
}
] | 2014-06-23 | [
[
"Arean",
"Daniel",
""
],
[
"Farahi",
"Arya",
""
],
[
"Zayas",
"Leopoldo A. Pando",
""
],
[
"Landea",
"Ignacio Salazar",
""
],
[
"Scardicchio",
"Antonello",
""
]
] | We study the effects of disorder on a holographic superconductor by introducing a random chemical potential on the boundary. We consider various realizations of disorder and find that the critical temperature for superconductivity is enhanced. We also present evidence for a precise form of renormalization in this system. Namely, when the random chemical potential is characterized by a Fourier spectrum of the form $k^{-2\alpha}$ we find that the spectra of the condensate and the charge density are again power-laws, whose exponents are accurately and universally governed by linear functions of $\alpha$. |
1210.6807 | Laszlo Arpad Gergely | M\'arton T\'apai, Zolt\'an Keresztes, L\'aszl\'o \'Arp\'ad Gergely | Gravitational waveforms for black hole binaries with unequal masses | submitted to the proceedings of the conference on Relativity and
Gravitation: 100 Years after Einstein in Prague | Springer Proceedings in Physics 157, 455-458 (2014) | 10.1007/978-3-319-06761-2_65 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derived a post-Newtonian (PN) inspiral only gravitational waveform for
unequal mass, spinning black hole binaries. Towards the end of the inspiral the
larger spin dominates over the orbital angular momentum (while the smaller spin
is negligible), hence the name Spin-Dominated Waveforms (SDW). Such systems are
common sources for future gravitational wave detectors and during the inspiral
the largest amplitude waves are emitted exactly in its last part. The SDW
waveforms emerge as a double expansion in the PN parameter and the ratio of the
orbital angular momentum to the dominant spin.
| [
{
"created": "Thu, 25 Oct 2012 12:22:23 GMT",
"version": "v1"
}
] | 2014-09-12 | [
[
"Tápai",
"Márton",
""
],
[
"Keresztes",
"Zoltán",
""
],
[
"Gergely",
"László Árpád",
""
]
] | We derived a post-Newtonian (PN) inspiral only gravitational waveform for unequal mass, spinning black hole binaries. Towards the end of the inspiral the larger spin dominates over the orbital angular momentum (while the smaller spin is negligible), hence the name Spin-Dominated Waveforms (SDW). Such systems are common sources for future gravitational wave detectors and during the inspiral the largest amplitude waves are emitted exactly in its last part. The SDW waveforms emerge as a double expansion in the PN parameter and the ratio of the orbital angular momentum to the dominant spin. |
hep-th/0703149 | Serkay Olmez | S. Olmez, M. Shifman | Curves of Marginal Stability in Two-Dimensional CP(N-1) Models with
Z_N-Symmetric Twisted Masses | Minor changes, comments and references added | J.Phys.A40:11151-11164,2007 | 10.1088/1751-8113/40/36/014 | null | hep-th | null | We consider curves of marginal stability (CMS) in CP(N-1) models in two
dimensions with N = (2, 2) supersymmetry. In these theories, one can introduce
twisted mass terms. The BPS spectrum has different number of states in the weak
and strong coupling regimes. This spectral restructuring can be explained by
the fact that two regimes are separated by CMS on which some BPS states decay.
We focus on a special case of Z_N-symmetric twisted masses. In this case, the
general solution due to Dorey greatly simplifies, and CMS can be found
explicitly. For small-$N$ values numerical results are presented. In the
large-N limit, we find CMS analytically up to ln N /N corrections.
| [
{
"created": "Thu, 15 Mar 2007 20:25:19 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Apr 2007 16:03:07 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Olmez",
"S.",
""
],
[
"Shifman",
"M.",
""
]
] | We consider curves of marginal stability (CMS) in CP(N-1) models in two dimensions with N = (2, 2) supersymmetry. In these theories, one can introduce twisted mass terms. The BPS spectrum has different number of states in the weak and strong coupling regimes. This spectral restructuring can be explained by the fact that two regimes are separated by CMS on which some BPS states decay. We focus on a special case of Z_N-symmetric twisted masses. In this case, the general solution due to Dorey greatly simplifies, and CMS can be found explicitly. For small-$N$ values numerical results are presented. In the large-N limit, we find CMS analytically up to ln N /N corrections. |
1507.06547 | Nady Bakhet | Nady Bakhet, Maxim Yu. Khlopov, Tarek Hussein | Neural Networks Search for Charged Higgs Boson of Two Doublet Higgs
Model at the Hadrons Colliders | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we present an analysis of a search for charged Higgs boson in
the context of Two Doublet Higgs Model (2HDM) which is an extension of the
Standard Model of particles physics. The 2HDM predicts by existence scalar
sector with new five Higgs bosons, two of them are electrically charged and the
other three Higgs bosons are neutral charged. Our analysis based on the Monte
Carlo data produced from the simulation of 2HDM with proton antiproton
collisions at the Tevatron $\sqrt{s}=1.96$ TeV (Fermi Lab) and proton proton
collisions at the LHC $\sqrt{s}=14$ TeV (CERN) with final state includes
electron , muon , multiple jets and missing transverse energy via the
production and decay of the new Higgs in the hard process
$pp(\bar{p})\rightarrow t\bar{t}\rightarrow H^{+}b H^{-}\bar{b}$
| [
{
"created": "Thu, 23 Jul 2015 16:11:49 GMT",
"version": "v1"
}
] | 2015-07-24 | [
[
"Bakhet",
"Nady",
""
],
[
"Khlopov",
"Maxim Yu.",
""
],
[
"Hussein",
"Tarek",
""
]
] | In this work, we present an analysis of a search for charged Higgs boson in the context of Two Doublet Higgs Model (2HDM) which is an extension of the Standard Model of particles physics. The 2HDM predicts by existence scalar sector with new five Higgs bosons, two of them are electrically charged and the other three Higgs bosons are neutral charged. Our analysis based on the Monte Carlo data produced from the simulation of 2HDM with proton antiproton collisions at the Tevatron $\sqrt{s}=1.96$ TeV (Fermi Lab) and proton proton collisions at the LHC $\sqrt{s}=14$ TeV (CERN) with final state includes electron , muon , multiple jets and missing transverse energy via the production and decay of the new Higgs in the hard process $pp(\bar{p})\rightarrow t\bar{t}\rightarrow H^{+}b H^{-}\bar{b}$ |
2311.17719 | Gonzalo Herrera | Gonzalo Herrera | A neutrino floor for the Migdal effect | Matches published version in JHEP | JHEP 05 (2024) 288 | 10.1007/JHEP05(2024)288 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrino-nucleus scatterings in the detector could induce electron ionization
signatures due to the Migdal effect. We derive prospects for a future detection
of the Migdal effect via coherent elastic solar neutrino-nucleus scatterings in
liquid xenon detectors, and discuss the irreducible background that it
constitutes for the Migdal effect caused by light dark matter-nucleus
scatterings. Furthermore, we explore the ionization signal induced by some
neutrino electromagnetic and non-standard interactions on nuclei. In certain
scenarios, we find a distinct peak on the ionization spectrum of xenon around
0.1 keV, in clear contrast to the Standard Model expectation.
| [
{
"created": "Wed, 29 Nov 2023 15:20:20 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Mar 2024 04:27:58 GMT",
"version": "v2"
},
{
"created": "Sat, 18 May 2024 23:03:03 GMT",
"version": "v3"
}
] | 2024-05-30 | [
[
"Herrera",
"Gonzalo",
""
]
] | Neutrino-nucleus scatterings in the detector could induce electron ionization signatures due to the Migdal effect. We derive prospects for a future detection of the Migdal effect via coherent elastic solar neutrino-nucleus scatterings in liquid xenon detectors, and discuss the irreducible background that it constitutes for the Migdal effect caused by light dark matter-nucleus scatterings. Furthermore, we explore the ionization signal induced by some neutrino electromagnetic and non-standard interactions on nuclei. In certain scenarios, we find a distinct peak on the ionization spectrum of xenon around 0.1 keV, in clear contrast to the Standard Model expectation. |
1109.1371 | Luis Granda | L. N. Granda | Late time cosmological scenarios from scalar field with Gauss Bonnet and
non-minimal kinetic couplings | 25 pages | null | 10.1007/s10773-012-1157-z | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a model of scalar field with kinetic terms non-minimally coupled to
to the curvature, and the scalar field coupled to the Gauss Bonnet
4-dimensional invariant. A variety of solutions are found, giving rise to
different cosmological scenarios. A unified description of early time matter
(radiation) dominance with transitions to late time quintessence and phantom
phases have been made. Among others, we found solutions unifying asymptotically
the early power law behavior and late time cosmological constant. Solutions of
Chaplygin gas and generalized Chaplygin gas cosmologies have also been found.
| [
{
"created": "Wed, 7 Sep 2011 07:06:36 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Granda",
"L. N.",
""
]
] | We study a model of scalar field with kinetic terms non-minimally coupled to to the curvature, and the scalar field coupled to the Gauss Bonnet 4-dimensional invariant. A variety of solutions are found, giving rise to different cosmological scenarios. A unified description of early time matter (radiation) dominance with transitions to late time quintessence and phantom phases have been made. Among others, we found solutions unifying asymptotically the early power law behavior and late time cosmological constant. Solutions of Chaplygin gas and generalized Chaplygin gas cosmologies have also been found. |
1611.06212 | Evan Johnson | Evan Johnson, Eric Braaten, Hong Zhang | Wino dark matter annihilation through the radiative formation of bound
states | 6 pages, 5 figures. Contribution to proceedings of ICHEP 2016 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The most dramatic "Sommerfeld enhancements" of neutral-wino-pair annihilation
occur when the wino mass is tuned to near critical values where there is a
zero-energy S-wave resonance at the neutral-wino-pair threshold. If the wino
mass is larger than the critical value, the resonance is a wino-pair bound
state. If the wino mass is near a critical value, low-energy winos can be
described by a zero-range effective field theory in which the winos interact
nonperturbatively through a contact interaction. The parameters of the
zero-range effective field theory can be determined by matching wino scattering
amplitudes calculated by solving the Schr\"odinger equation for a
nonrelativistic effective field theory in which the winos interact through a
potential due to the exchange of electroweak gauge bosons. The utility of the
zero-range effective field theory is illustrated by calculating the rate for
formation of an S-wave bound state in the collision of two neutral winos
through the emission of two soft photons.
| [
{
"created": "Fri, 18 Nov 2016 20:01:06 GMT",
"version": "v1"
}
] | 2016-11-21 | [
[
"Johnson",
"Evan",
""
],
[
"Braaten",
"Eric",
""
],
[
"Zhang",
"Hong",
""
]
] | The most dramatic "Sommerfeld enhancements" of neutral-wino-pair annihilation occur when the wino mass is tuned to near critical values where there is a zero-energy S-wave resonance at the neutral-wino-pair threshold. If the wino mass is larger than the critical value, the resonance is a wino-pair bound state. If the wino mass is near a critical value, low-energy winos can be described by a zero-range effective field theory in which the winos interact nonperturbatively through a contact interaction. The parameters of the zero-range effective field theory can be determined by matching wino scattering amplitudes calculated by solving the Schr\"odinger equation for a nonrelativistic effective field theory in which the winos interact through a potential due to the exchange of electroweak gauge bosons. The utility of the zero-range effective field theory is illustrated by calculating the rate for formation of an S-wave bound state in the collision of two neutral winos through the emission of two soft photons. |
hep-ph/0204271 | Carlos Munoz | D.G. Cerdeno, E. Gabrielli, C. Munoz | Experimental Constraints on the Neutralino-Nucleon Cross Section | References added, bsgamma upper bound improved, results unchanged,
Talk given at Corfu Summer Institute on Elementary Particle Physics, August
31-September 20, 2001 | null | null | FTUAM 02/11, IFT-UAM/CSIC-02-11, HIP-2002-17/TH | hep-ph | null | In the light of recent experimental results for the direct detection of dark
matter, we analyze in the framework of SUGRA the value of the
neutralino-nucleon cross section. We study how this value is modified when the
usual assumptions of universal soft terms and GUT scale are relaxed. In
particular we consider scenarios with non-universal scalar and gaugino masses
and scenarios with intermediate unification scale. We also study superstring
constructions with D-branes, where a combination of the above two scenarios
arises naturally. In the analysis we take into account the most recent
experimental constraints, such as the lower bound on the Higgs mass, the $b\to
s\gamma$ branching ratio, and the muon $g-2$.
| [
{
"created": "Tue, 23 Apr 2002 16:25:55 GMT",
"version": "v1"
},
{
"created": "Tue, 14 May 2002 19:49:08 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Cerdeno",
"D. G.",
""
],
[
"Gabrielli",
"E.",
""
],
[
"Munoz",
"C.",
""
]
] | In the light of recent experimental results for the direct detection of dark matter, we analyze in the framework of SUGRA the value of the neutralino-nucleon cross section. We study how this value is modified when the usual assumptions of universal soft terms and GUT scale are relaxed. In particular we consider scenarios with non-universal scalar and gaugino masses and scenarios with intermediate unification scale. We also study superstring constructions with D-branes, where a combination of the above two scenarios arises naturally. In the analysis we take into account the most recent experimental constraints, such as the lower bound on the Higgs mass, the $b\to s\gamma$ branching ratio, and the muon $g-2$. |
hep-th/0105267 | R. Loll | J. Ambjorn (NBI, Copenhagen), J. Jurkiewicz (U. Krakow) and R. Loll
(AEI, Golm) | Dynamically Triangulating Lorentzian Quantum Gravity | 41 pages, 14 figures | Nucl.Phys. B610 (2001) 347-382 | 10.1016/S0550-3213(01)00297-8 | AEI-2001-049 | hep-th gr-qc hep-lat | null | Fruitful ideas on how to quantize gravity are few and far between. In this
paper, we give a complete description of a recently introduced non-perturbative
gravitational path integral whose continuum limit has already been investigated
extensively in d less than 4, with promising results. It is based on a
simplicial regularization of Lorentzian space-times and, most importantly,
possesses a well-defined, non-perturbative Wick rotation. We present a detailed
analysis of the geometric and mathematical properties of the discretized model
in d=3,4. This includes a derivation of Lorentzian simplicial manifold
constraints, the gravitational actions and their Wick rotation. We define a
transfer matrix for the system and show that it leads to a well-defined
self-adjoint Hamiltonian. In view of numerical simulations, we also suggest
sets of Lorentzian Monte Carlo moves. We demonstrate that certain pathological
phases found previously in Euclidean models of dynamical triangulations cannot
be realized in the Lorentzian case.
| [
{
"created": "Sun, 27 May 2001 23:02:25 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Ambjorn",
"J.",
"",
"NBI, Copenhagen"
],
[
"Jurkiewicz",
"J.",
"",
"U. Krakow"
],
[
"Loll",
"R.",
"",
"AEI, Golm"
]
] | Fruitful ideas on how to quantize gravity are few and far between. In this paper, we give a complete description of a recently introduced non-perturbative gravitational path integral whose continuum limit has already been investigated extensively in d less than 4, with promising results. It is based on a simplicial regularization of Lorentzian space-times and, most importantly, possesses a well-defined, non-perturbative Wick rotation. We present a detailed analysis of the geometric and mathematical properties of the discretized model in d=3,4. This includes a derivation of Lorentzian simplicial manifold constraints, the gravitational actions and their Wick rotation. We define a transfer matrix for the system and show that it leads to a well-defined self-adjoint Hamiltonian. In view of numerical simulations, we also suggest sets of Lorentzian Monte Carlo moves. We demonstrate that certain pathological phases found previously in Euclidean models of dynamical triangulations cannot be realized in the Lorentzian case. |
1602.00209 | Ying-nan Mao | Ying-nan Mao and Shou-hua Zhu | Lightness of a Higgs Boson and Spontaneous CP-violation in the Lee
Model: An Alternative Scenario | 53 pages, 17 figures, 6 tables; more references added, typos and
errors corrected, more details about future tests added as suggested by the
referee; accepted version by PRD | Phys. Rev. D 94, 055008 (2016) | 10.1103/PhysRevD.94.055008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the weakly-coupled two-Higgs-doublet model with spontaneous
CP-violation (named Lee model) and the mechanism to generate the correlation
between smallness of CP-violation and lightness of scalar mass, as we proposed
earlier, we predicted a light CP-mixing scalar $\eta$ in which pseudoscalar
component is dominant. It is a natural scenario in which
$m_{\eta}\sim\mathcal{O}(10\textrm{GeV})\ll v$. Masses of all other scalars
($h$, $H$, $H^\pm$) should be around the electro-weak scale $v$. Among them,
the 125 GeV Higgs ($h$) couplings are standard-model like, and the charged
Higgs ($H^\pm$) mass should be around the heaviest neutral scalar ($H$) mass.
We discussed all experimental constraints and showed that this scenario is
still allowed by data. The strictest constraints come from the experiments of
the flavor-changing processes and the EDM of lepton and neutron. We also
discussed the future tests for this scenario. It is possible to discover the
extra scalars or exclude this scenario at future colliders, especially at the
LHC and $e^+e^-$ colliders with $\mathcal{O}(\textrm{ab}^{-1})$ luminosity. We
also pointed out that the $Z$-mediated Higgs pair production via
$e^+e^-\rightarrow h_ih_j$ ($h_i, h_j$ stand for two of the $\eta, h, H$) would
be the key observable to confirm or exclude CP-violation in Higgs sector. The
sensitivity to test this scenario is worth further studying in greater detail.
| [
{
"created": "Sun, 31 Jan 2016 07:29:47 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Sep 2016 07:21:54 GMT",
"version": "v2"
}
] | 2016-12-21 | [
[
"Mao",
"Ying-nan",
""
],
[
"Zhu",
"Shou-hua",
""
]
] | Based on the weakly-coupled two-Higgs-doublet model with spontaneous CP-violation (named Lee model) and the mechanism to generate the correlation between smallness of CP-violation and lightness of scalar mass, as we proposed earlier, we predicted a light CP-mixing scalar $\eta$ in which pseudoscalar component is dominant. It is a natural scenario in which $m_{\eta}\sim\mathcal{O}(10\textrm{GeV})\ll v$. Masses of all other scalars ($h$, $H$, $H^\pm$) should be around the electro-weak scale $v$. Among them, the 125 GeV Higgs ($h$) couplings are standard-model like, and the charged Higgs ($H^\pm$) mass should be around the heaviest neutral scalar ($H$) mass. We discussed all experimental constraints and showed that this scenario is still allowed by data. The strictest constraints come from the experiments of the flavor-changing processes and the EDM of lepton and neutron. We also discussed the future tests for this scenario. It is possible to discover the extra scalars or exclude this scenario at future colliders, especially at the LHC and $e^+e^-$ colliders with $\mathcal{O}(\textrm{ab}^{-1})$ luminosity. We also pointed out that the $Z$-mediated Higgs pair production via $e^+e^-\rightarrow h_ih_j$ ($h_i, h_j$ stand for two of the $\eta, h, H$) would be the key observable to confirm or exclude CP-violation in Higgs sector. The sensitivity to test this scenario is worth further studying in greater detail. |
2005.02418 | Jarkko Peuron | K. Boguslavski, A. Kurkela, T. Lappi, J. Peuron | Heavy quark diffusion in an overoccupied gluon plasma | 21 pages, 10 figures; v2: published version - minor changes in
captions and figures | JHEP 09 (2020) 077 | 10.1007/JHEP09(2020)077 | CERN-TH-2020-069 | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extract the heavy-quark diffusion coefficient \kappa and the resulting
momentum broadening <p^2> in a far-from-equilibrium non-Abelian plasma. We find
several features in the time dependence of the momentum broadening: a short
initial rapid growth of <p^2>, followed by linear growth with time due to
Langevin-type dynamics and damped oscillations around this growth at the
plasmon frequency. We show that these novel oscillations are not easily
explained using perturbative techniques but result from an excess of gluons at
low momenta. These oscillation are therefore a gauge invariant confirmation of
the infrared enhancement we had previously observed in gauge-fixed correlation
functions. We argue that the kinetic theory description of such systems becomes
less reliable in the presence of this IR enhancement.
| [
{
"created": "Tue, 5 May 2020 18:00:26 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Sep 2020 10:30:18 GMT",
"version": "v2"
}
] | 2020-09-17 | [
[
"Boguslavski",
"K.",
""
],
[
"Kurkela",
"A.",
""
],
[
"Lappi",
"T.",
""
],
[
"Peuron",
"J.",
""
]
] | We extract the heavy-quark diffusion coefficient \kappa and the resulting momentum broadening <p^2> in a far-from-equilibrium non-Abelian plasma. We find several features in the time dependence of the momentum broadening: a short initial rapid growth of <p^2>, followed by linear growth with time due to Langevin-type dynamics and damped oscillations around this growth at the plasmon frequency. We show that these novel oscillations are not easily explained using perturbative techniques but result from an excess of gluons at low momenta. These oscillation are therefore a gauge invariant confirmation of the infrared enhancement we had previously observed in gauge-fixed correlation functions. We argue that the kinetic theory description of such systems becomes less reliable in the presence of this IR enhancement. |
gr-qc/0612097 | Mark Hannam | Mark Hannam, Sascha Husa, Niall \'O Murchadha, Bernd Br\"ugmann,
Jos\'e A. Gonz\'alez, Ulrich Sperhake | Where do moving punctures go? | Proceedings for 29th Spanish Relativity Meeting. Added more details
about the time-independent solution, with reference to the analytic result of
Baumgarte and Naculich | J.Phys.Conf.Ser.66:012047,2007 | 10.1088/1742-6596/66/1/012047 | null | gr-qc | null | Currently the most popular method to evolve black-hole binaries is the
``moving puncture'' method. It has recently been shown that when puncture
initial data for a Schwarzschild black hole are evolved using this method, the
numerical slices quickly lose contact with the second asymptotically flat end,
and end instead on a cylinder of finite Schwarzschild coordinate radius. These
slices are stationary, meaning that their geometry does not evolve further. We
will describe these results in the context of maximal slices, and present
time-independent puncture-like data for the Schwarzschild spacetime.
| [
{
"created": "Fri, 15 Dec 2006 17:21:42 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Dec 2006 16:08:21 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Feb 2007 13:29:26 GMT",
"version": "v3"
}
] | 2016-08-16 | [
[
"Hannam",
"Mark",
""
],
[
"Husa",
"Sascha",
""
],
[
"Murchadha",
"Niall Ó",
""
],
[
"Brügmann",
"Bernd",
""
],
[
"González",
"José A.",
""
],
[
"Sperhake",
"Ulrich",
""
]
] | Currently the most popular method to evolve black-hole binaries is the ``moving puncture'' method. It has recently been shown that when puncture initial data for a Schwarzschild black hole are evolved using this method, the numerical slices quickly lose contact with the second asymptotically flat end, and end instead on a cylinder of finite Schwarzschild coordinate radius. These slices are stationary, meaning that their geometry does not evolve further. We will describe these results in the context of maximal slices, and present time-independent puncture-like data for the Schwarzschild spacetime. |
hep-ph/9701275 | Francesco Becattini | F. Becattini (INFN Sezione di Firenze) | Universality of thermal hadron production in pp, p{\bar p} and e^+e^-
collisions | 29 pages, 10 .eps figures, to be published in the Proceedings of the
XXXIII Eloisatron Workshop "Universality features in Multihadron production
and the leading effect", October 19-25 1996, Erice (Italy) Revision - Few
minor text changes and corrections | null | null | DFF 263/12/1996 | hep-ph | null | It is shown that the hadron production in high energy pp, p{\bar p} and
e^+e^- collisions, calculated by assuming that particles originate in hadron
gas fireballs at thermal and partial chemical equilibrium, agrees very well
with the data. The temperature of the hadron gas fireballs, determined by
fitting hadron abundances, does not seem to depend on the centre of mass energy
and kind of reaction, having a nearly constant value of about 170 MeV. This
finding supports a universal hadronization mechanism in all kinds of reactions
consisting in a parton-hadron transition at critical values of temperature and
pressure.
| [
{
"created": "Sun, 12 Jan 1997 18:10:48 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jan 1997 17:58:26 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Becattini",
"F.",
"",
"INFN Sezione di Firenze"
]
] | It is shown that the hadron production in high energy pp, p{\bar p} and e^+e^- collisions, calculated by assuming that particles originate in hadron gas fireballs at thermal and partial chemical equilibrium, agrees very well with the data. The temperature of the hadron gas fireballs, determined by fitting hadron abundances, does not seem to depend on the centre of mass energy and kind of reaction, having a nearly constant value of about 170 MeV. This finding supports a universal hadronization mechanism in all kinds of reactions consisting in a parton-hadron transition at critical values of temperature and pressure. |
0707.2174 | Christopher Pope | G.W. Gibbons, Joaquim Gomis, C.N. Pope | General Very Special Relativity is Finsler Geometry | 4 pages, minor corrections, references added | Phys.Rev.D76:081701,2007 | 10.1103/PhysRevD.76.081701 | DAMTP-2007-68, UB-ECM-PF-07-17, MIFP-07-18 | hep-th gr-qc hep-ph | null | We ask whether Cohen and Glashow's Very Special Relativity model for Lorentz
violation might be modified, perhaps by quantum corrections, possibly producing
a curved spacetime with a cosmological constant. We show that its symmetry
group ISIM(2) does admit a 2-parameter family of continuous deformations, but
none of these give rise to non-commutative translations analogous to those of
the de Sitter deformation of the Poincar\'e group: spacetime remains flat. Only
a 1-parameter family DISIM_b(2) of deformations of SIM(2) is physically
acceptable. Since this could arise through quantum corrections, its
implications for tests of Lorentz violations via the Cohen-Glashow proposal
should be taken into account. The Lorentz-violating point particle action
invariant under DISIM_b(2) is of Finsler type, for which the line element is
homogeneous of degree 1 in displacements, but anisotropic. We derive
DISIM_b(2)-invariant wave equations for particles of spins 0, 1/2 and 1. The
experimental bound, $|b|<10^{-26}$, raises the question ``Why is the
dimensionless constant $b$ so small in Very Special Relativity?''
| [
{
"created": "Sat, 14 Jul 2007 21:46:54 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Aug 2007 09:08:13 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Gibbons",
"G. W.",
""
],
[
"Gomis",
"Joaquim",
""
],
[
"Pope",
"C. N.",
""
]
] | We ask whether Cohen and Glashow's Very Special Relativity model for Lorentz violation might be modified, perhaps by quantum corrections, possibly producing a curved spacetime with a cosmological constant. We show that its symmetry group ISIM(2) does admit a 2-parameter family of continuous deformations, but none of these give rise to non-commutative translations analogous to those of the de Sitter deformation of the Poincar\'e group: spacetime remains flat. Only a 1-parameter family DISIM_b(2) of deformations of SIM(2) is physically acceptable. Since this could arise through quantum corrections, its implications for tests of Lorentz violations via the Cohen-Glashow proposal should be taken into account. The Lorentz-violating point particle action invariant under DISIM_b(2) is of Finsler type, for which the line element is homogeneous of degree 1 in displacements, but anisotropic. We derive DISIM_b(2)-invariant wave equations for particles of spins 0, 1/2 and 1. The experimental bound, $|b|<10^{-26}$, raises the question ``Why is the dimensionless constant $b$ so small in Very Special Relativity?'' |
1409.1410 | Neda Farhangkhah | N. Farhangkhah, M. H. Dehghani | Lovelock black holes with nonmaximally symmetric horizons | 16 pages, 3 figures | Phys. Rev. D 90, 044014 (2014) | 10.1103/PhysRevD.90.044014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new class of black hole solutions in third-order Lovelock
gravity whose horizons are Einstein space with two supplementary conditions on
their Weyl tensors. These solutions are obtained with the advantage of higher
curvature terms appearing in Lovelock gravity. We find that while the solution
of third-order Lovelock gravity with constant-curvature horizon in the absence
of a mass parameter is the anti de Sitter (AdS) metric, this kind of solution
with nonconstant- curvature horizon is only asymptotically AdS and may have
horizon. We also find that one may have an extreme black hole with non-constant
curvature horizon whose Ricci scalar is zero or a positive constant, while
there is no such black hole with constant-curvature horizon. Furthermore, the
thermodynamics of the black holes in the two cases of constant- and
nonconstant-curvature horizons are different drastically. Specially, we
consider the thermodynamics of black holes with vanishing Ricci scalar and find
that in contrast to the case of black holes of Lovelock gravity with
constant-curvature horizon, the area law of entropy is not satisfied. Finally,
we investigate the stability of these black holes both locally and globally and
find that while the black holes with constant curvature horizons are stable
both locally and globally, those with nonconstant-curvature horizons have
unstable phases.
| [
{
"created": "Thu, 4 Sep 2014 11:52:09 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Farhangkhah",
"N.",
""
],
[
"Dehghani",
"M. H.",
""
]
] | We present a new class of black hole solutions in third-order Lovelock gravity whose horizons are Einstein space with two supplementary conditions on their Weyl tensors. These solutions are obtained with the advantage of higher curvature terms appearing in Lovelock gravity. We find that while the solution of third-order Lovelock gravity with constant-curvature horizon in the absence of a mass parameter is the anti de Sitter (AdS) metric, this kind of solution with nonconstant- curvature horizon is only asymptotically AdS and may have horizon. We also find that one may have an extreme black hole with non-constant curvature horizon whose Ricci scalar is zero or a positive constant, while there is no such black hole with constant-curvature horizon. Furthermore, the thermodynamics of the black holes in the two cases of constant- and nonconstant-curvature horizons are different drastically. Specially, we consider the thermodynamics of black holes with vanishing Ricci scalar and find that in contrast to the case of black holes of Lovelock gravity with constant-curvature horizon, the area law of entropy is not satisfied. Finally, we investigate the stability of these black holes both locally and globally and find that while the black holes with constant curvature horizons are stable both locally and globally, those with nonconstant-curvature horizons have unstable phases. |
hep-ph/0112314 | Qun Wang | Qun Wang, Krzysztof Redlich, Horst St\"ocker, Walter Greiner | Kinetic equation for gluons at the early stage | 6 pages, no figure, to appear in the proceedings of the 6th
international conference on strange quarks in matter, Frankfurt, Germany,
25-29 september 2001 | J.Phys.G28:2115-2120,2002 | 10.1088/0954-3899/28/7/381 | null | hep-ph | null | We derive the kinetic equation for pure gluon QCD plasma in a general way,
applying the background field method. We show that the quantum kinetic equation
contains a term as in the classical case, that describes a color charge
precession of partons moving in the gauge field. We emphasize that this new
term is necessary for the gauge covariance of the resulting equation.
| [
{
"created": "Sat, 22 Dec 2001 10:27:32 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Wang",
"Qun",
""
],
[
"Redlich",
"Krzysztof",
""
],
[
"Stöcker",
"Horst",
""
],
[
"Greiner",
"Walter",
""
]
] | We derive the kinetic equation for pure gluon QCD plasma in a general way, applying the background field method. We show that the quantum kinetic equation contains a term as in the classical case, that describes a color charge precession of partons moving in the gauge field. We emphasize that this new term is necessary for the gauge covariance of the resulting equation. |
1703.11007 | Robie Hennigar | Jamil Ahmed, Robie A. Hennigar, Robert B. Mann, and Mozhgan Mir | Quintessential Quartic Quasi-topological Quartet | 46 pages, 1 figure. Discussion of black branes added to section 5 | null | 10.1007/JHEP05(2017)134 | null | hep-th gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct the quartic version of generalized quasi-topological gravity,
which was recently constructed to cubic order in arXiv: 1703.01631. This class
of theories includes Lovelock gravity and a known form of quartic
quasi-topological gravity as special cases and possess a number of remarkable
properties: (i) In vacuum, or in the presence of suitable matter, there is a
single independent field equation which is a total derivative. (ii) At the
linearized level, the equations of motion on a maximally symmetric background
are second order, coinciding with the linearized Einstein equations up to a
redefinition of Newton's constant. Therefore, these theories propagate only the
massless, transverse graviton on a maximally symmetric background. (iii) While
the Lovelock and quasi-topological terms are trivial in four dimensions, there
exist four new generalized quasi-topological terms (the quartet) that are
nontrivial, leading to interesting higher curvature theories in $d \geq 4$
dimensions that appear well suited for holographic study. We construct four
dimensional black hole solutions to the theory and study their properties. A
study of black brane solutions in arbitrary dimensions reveals that these
solutions are modified from the `universal' properties these solutions have.
This result may lead to interesting consequences for the dual CFTs.
| [
{
"created": "Fri, 31 Mar 2017 17:55:14 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Apr 2017 17:36:42 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Ahmed",
"Jamil",
""
],
[
"Hennigar",
"Robie A.",
""
],
[
"Mann",
"Robert B.",
""
],
[
"Mir",
"Mozhgan",
""
]
] | We construct the quartic version of generalized quasi-topological gravity, which was recently constructed to cubic order in arXiv: 1703.01631. This class of theories includes Lovelock gravity and a known form of quartic quasi-topological gravity as special cases and possess a number of remarkable properties: (i) In vacuum, or in the presence of suitable matter, there is a single independent field equation which is a total derivative. (ii) At the linearized level, the equations of motion on a maximally symmetric background are second order, coinciding with the linearized Einstein equations up to a redefinition of Newton's constant. Therefore, these theories propagate only the massless, transverse graviton on a maximally symmetric background. (iii) While the Lovelock and quasi-topological terms are trivial in four dimensions, there exist four new generalized quasi-topological terms (the quartet) that are nontrivial, leading to interesting higher curvature theories in $d \geq 4$ dimensions that appear well suited for holographic study. We construct four dimensional black hole solutions to the theory and study their properties. A study of black brane solutions in arbitrary dimensions reveals that these solutions are modified from the `universal' properties these solutions have. This result may lead to interesting consequences for the dual CFTs. |
1301.0809 | Babak Vakili | B. Vakili and V. Kord | Classical and quantum Ho\v{r}ava-Lifshitz cosmology in a minisuperspace
perspective | 15 pages, 12 figures. revised version. arXiv admin note: substantial
text overlap with arXiv:1204.1456 | Gen. Rel. Grav. 45 (2013) 1313 | 10.1007/s10714-013-1527-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the classical and quantum models of a Friedmann-Robertson-Walker
(FRW) cosmology in the framework of the gravity theory proposed by Ho\v{r}ava,
the so-called Ho\v{r}ava-Lifshitz theory of gravity. Beginning with the ADM
representation of the action corresponding to this model, we construct the
Lagrangian in terms of the minisuperspace variables and show that in comparison
with the usual Einstein-Hilbert gravity, there are some correction terms coming
from the Ho\v{r}ava theory. Either in the matter free or in the case when the
considered universe is filled with a perfect fluid, the exact solutions to the
classical field equations are obtained for the flat, closed and open FRW model
and some discussions about their possible singularities are presented. We then
deal with the quantization of the model in the context of the Wheeler-DeWitt
approach of quantum cosmology to find the cosmological wave function. We use
the resulting wave functions to investigate the possibility of the avoidance of
classical singularities due to quantum effects.
| [
{
"created": "Fri, 4 Jan 2013 19:35:28 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Apr 2013 15:46:02 GMT",
"version": "v2"
}
] | 2013-06-11 | [
[
"Vakili",
"B.",
""
],
[
"Kord",
"V.",
""
]
] | We study the classical and quantum models of a Friedmann-Robertson-Walker (FRW) cosmology in the framework of the gravity theory proposed by Ho\v{r}ava, the so-called Ho\v{r}ava-Lifshitz theory of gravity. Beginning with the ADM representation of the action corresponding to this model, we construct the Lagrangian in terms of the minisuperspace variables and show that in comparison with the usual Einstein-Hilbert gravity, there are some correction terms coming from the Ho\v{r}ava theory. Either in the matter free or in the case when the considered universe is filled with a perfect fluid, the exact solutions to the classical field equations are obtained for the flat, closed and open FRW model and some discussions about their possible singularities are presented. We then deal with the quantization of the model in the context of the Wheeler-DeWitt approach of quantum cosmology to find the cosmological wave function. We use the resulting wave functions to investigate the possibility of the avoidance of classical singularities due to quantum effects. |
hep-ph/9809327 | null | U. Baur (SUNY Buffalo) | Electroweak Radiative Corrections to W Boson Production at the Tevatron | 6 pages, LaTeX, uses ltwol2e_ub style file (included), 3 postscript
figures, talk given at ICHEP98 | null | null | UB-HET-98-02 | hep-ph | null | We discuss the O(alpha) electroweak radiative corrections to W boson
production at the Tevatron and their effect on the W boson mass extracted by
experiment. The results of a new calculation of the O(alpha) corrections are
presented and compared with those of a previous calculation. We also briefly
discuss the O(alpha) corrections to Z boson production at the Tevatron and
two-photon radiation in W and Z events.
| [
{
"created": "Thu, 10 Sep 1998 20:27:20 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Baur",
"U.",
"",
"SUNY Buffalo"
]
] | We discuss the O(alpha) electroweak radiative corrections to W boson production at the Tevatron and their effect on the W boson mass extracted by experiment. The results of a new calculation of the O(alpha) corrections are presented and compared with those of a previous calculation. We also briefly discuss the O(alpha) corrections to Z boson production at the Tevatron and two-photon radiation in W and Z events. |
2211.03804 | Avital Dery | Avital Dery, Mitrajyoti Ghosh, Yuval Grossman, Teppei Kitahara and
Stefan Schacht | A Precision Relation between $\Gamma(K\to\mu^+\mu^-)(t)$ and ${\cal
B}(K_L\to\mu^+\mu^-)/{\cal B}(K_L\to\gamma\gamma)$ | null | null | 10.1007/JHEP03(2023)014 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We find that the phase appearing in the unitarity relation between
$\mathcal{B}(K_L\rightarrow \mu^+\mu^-)$ and $\mathcal{B}(K_L\rightarrow
\gamma\gamma)$ is equal to the phase shift in the interference term of the
time-dependent $K\rightarrow \mu^+\mu^-$ decay. A probe of this relation at
future kaon facilities constitutes a Standard Model test with a theory
precision of about $2\%$. The phase has further importance for sensitivity
studies regarding the measurement of the time-dependent $K\rightarrow
\mu^+\mu^-$ decay rate to extract the CKM matrix element combination $\vert
V_{ts} V_{td} \sin(\beta+\beta_s)\vert\approx A^2\lambda^5\bar\eta$. We find a
model-independent theoretically clean prediction, $\cos^2\varphi_0 = 0.96 \pm
0.03$. The quoted error is a combination of the theoretical and experimental
errors, and both of them are expected to shrink in the future. Using input from
the large-$N_C$ limit within chiral perturbation theory, we find a theory
preference towards solutions with negative $\cos\varphi_0$, reducing a
four-fold ambiguity in the angle $\varphi_0$ to a two-fold one.
| [
{
"created": "Mon, 7 Nov 2022 19:00:03 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jun 2023 15:44:39 GMT",
"version": "v2"
}
] | 2023-06-13 | [
[
"Dery",
"Avital",
""
],
[
"Ghosh",
"Mitrajyoti",
""
],
[
"Grossman",
"Yuval",
""
],
[
"Kitahara",
"Teppei",
""
],
[
"Schacht",
"Stefan",
""
]
] | We find that the phase appearing in the unitarity relation between $\mathcal{B}(K_L\rightarrow \mu^+\mu^-)$ and $\mathcal{B}(K_L\rightarrow \gamma\gamma)$ is equal to the phase shift in the interference term of the time-dependent $K\rightarrow \mu^+\mu^-$ decay. A probe of this relation at future kaon facilities constitutes a Standard Model test with a theory precision of about $2\%$. The phase has further importance for sensitivity studies regarding the measurement of the time-dependent $K\rightarrow \mu^+\mu^-$ decay rate to extract the CKM matrix element combination $\vert V_{ts} V_{td} \sin(\beta+\beta_s)\vert\approx A^2\lambda^5\bar\eta$. We find a model-independent theoretically clean prediction, $\cos^2\varphi_0 = 0.96 \pm 0.03$. The quoted error is a combination of the theoretical and experimental errors, and both of them are expected to shrink in the future. Using input from the large-$N_C$ limit within chiral perturbation theory, we find a theory preference towards solutions with negative $\cos\varphi_0$, reducing a four-fold ambiguity in the angle $\varphi_0$ to a two-fold one. |
hep-ph/9404236 | null | V. Bernard, N. Kaiser and Ulf-G. Mei{\ss}ner | The Reaction $\pi N \to \pi \pi N$ at Threshold | 7 pp, LateX (uses epsf.sty), 3 figures appended as ps files (split
off as ppnf1.ps,ppnf2.ps,ppnf3.ps), CRN 94/19 | Phys.Lett. B332 (1994) 415-418; Erratum-ibid. B338 (1994) 520 | 10.1016/0370-2693(94)91274-2 | null | hep-ph nucl-th | null | We consider the chiral expansion for the reaction $\pi N \to \pi \pi N$ in
heavy baryon chiral perturbation theory. To order $M_\pi$ we derive novel
low--energy theorems that compare favorably with recent determinations of the
total cross sections for $\pi^+ p \to \pi^+ \pi^+ n$ and $\pi^- p \to \pi^0
\pi^0 n$.
| [
{
"created": "Fri, 8 Apr 1994 09:21:55 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Bernard",
"V.",
""
],
[
"Kaiser",
"N.",
""
],
[
"Meißner",
"Ulf-G.",
""
]
] | We consider the chiral expansion for the reaction $\pi N \to \pi \pi N$ in heavy baryon chiral perturbation theory. To order $M_\pi$ we derive novel low--energy theorems that compare favorably with recent determinations of the total cross sections for $\pi^+ p \to \pi^+ \pi^+ n$ and $\pi^- p \to \pi^0 \pi^0 n$. |
1506.00595 | Maxim Grigoriev | Glenn Barnich, Xavier Bekaert, Maxim Grigoriev | Notes on conformal invariance of gauge fields | 38 pages | null | 10.1088/1751-8113/48/50/505402 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In Lagrangian gauge systems, the vector space of global reducibility
parameters forms a module under the Lie algebra of symmetries of the action.
Since the classification of global reducibility parameters is generically
easier than the classification of symmetries of the action, this fact can be
used to constrain the latter when knowing the former. We apply this strategy
and its generalization for the non-Lagrangian setting to the problem of
conformal symmetry of various free higher spin gauge fields. This scheme allows
one to show that, in terms of potentials, massless higher spin gauge fields in
Minkowski space and partially-massless fields in (A)dS space are not conformal
for spin strictly greater than one, while in terms of curvatures, maximal-depth
partially-massless fields in four dimensions are also not conformal, unlike the
closely related, but less constrained, maximal-depth Fradkin--Tseytlin fields.
| [
{
"created": "Mon, 1 Jun 2015 18:19:05 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Dec 2015 17:13:58 GMT",
"version": "v2"
}
] | 2016-01-01 | [
[
"Barnich",
"Glenn",
""
],
[
"Bekaert",
"Xavier",
""
],
[
"Grigoriev",
"Maxim",
""
]
] | In Lagrangian gauge systems, the vector space of global reducibility parameters forms a module under the Lie algebra of symmetries of the action. Since the classification of global reducibility parameters is generically easier than the classification of symmetries of the action, this fact can be used to constrain the latter when knowing the former. We apply this strategy and its generalization for the non-Lagrangian setting to the problem of conformal symmetry of various free higher spin gauge fields. This scheme allows one to show that, in terms of potentials, massless higher spin gauge fields in Minkowski space and partially-massless fields in (A)dS space are not conformal for spin strictly greater than one, while in terms of curvatures, maximal-depth partially-massless fields in four dimensions are also not conformal, unlike the closely related, but less constrained, maximal-depth Fradkin--Tseytlin fields. |
1412.0641 | Cecilia Bejarano | Cecilia Bejarano, Rafael Ferraro, Mar\'ia Jos\'e Guzm\'an | Kerr geometry in f(T) gravity | 7 pages. Improved version; one reference updated and one new
reference added. Accepted for publication in Eur. Phys. J. C | Eur. Phys. J. C (2015) 75: 77 | 10.1140/epjc/s10052-015-3288-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Null tetrads are shown to be a valuable tool in teleparallel theories of
modified gravity. We use them to prove that Kerr geometry remains a solution
for a wide family of f(T) theories of gravity.
| [
{
"created": "Mon, 1 Dec 2014 20:50:03 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Feb 2015 21:40:29 GMT",
"version": "v2"
}
] | 2015-02-25 | [
[
"Bejarano",
"Cecilia",
""
],
[
"Ferraro",
"Rafael",
""
],
[
"Guzmán",
"María José",
""
]
] | Null tetrads are shown to be a valuable tool in teleparallel theories of modified gravity. We use them to prove that Kerr geometry remains a solution for a wide family of f(T) theories of gravity. |
1504.07856 | Golam Mortuza Hossain | Golam Mortuza Hossain and Gopal Sardar | Violation of Kubo-Martin-Schwinger condition along a Rindler trajectory
in polymer quantization | 6 pages, revtex4; v2 few clarifications on domain of perturbation
added; v3 initials in title expanded, few discussions and a reference are
added, to match with the published version | Phys. Rev. D 92 (2015) 2, 024018 | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Existence of Unruh effect is often understood from the property of two-point
function along Rindler trajectory where it satisfies KMS condition. In
particular, it exhibits the so-called KMS periodicity along imaginary time
direction. Corresponding period is then identified with reciprocal of Unruh
temperature times Boltzmann constant. We show here that the two-point function
including leading order perturbative corrections due to polymer quantization,
the quantization method used in loop quantum gravity, violates KMS condition in
low-energy regime. This violation is caused by correction terms which are not
Lorentz invariants. Consequently, polymer corrected two-point function along
Rindler trajectory looses its thermal interpretation. We discuss its
implications on existence of Unruh effect in the context of polymer
quantization.
| [
{
"created": "Wed, 29 Apr 2015 13:39:57 GMT",
"version": "v1"
},
{
"created": "Mon, 4 May 2015 12:45:33 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Oct 2015 10:52:06 GMT",
"version": "v3"
}
] | 2015-10-27 | [
[
"Hossain",
"Golam Mortuza",
""
],
[
"Sardar",
"Gopal",
""
]
] | Existence of Unruh effect is often understood from the property of two-point function along Rindler trajectory where it satisfies KMS condition. In particular, it exhibits the so-called KMS periodicity along imaginary time direction. Corresponding period is then identified with reciprocal of Unruh temperature times Boltzmann constant. We show here that the two-point function including leading order perturbative corrections due to polymer quantization, the quantization method used in loop quantum gravity, violates KMS condition in low-energy regime. This violation is caused by correction terms which are not Lorentz invariants. Consequently, polymer corrected two-point function along Rindler trajectory looses its thermal interpretation. We discuss its implications on existence of Unruh effect in the context of polymer quantization. |
hep-th/0506084 | Subir Ghosh | Subir Ghosh (Indian Statistical Institute) | The $AdS$ particle | The last para and references related to it are new, minor changes,
version to appear in Phys.Lett.B | Phys.Lett. B623 (2005) 251-257 | 10.1016/j.physletb.2005.07.055 | null | hep-th | null | In this note we have considered a relativistic Nambu-Goto model for a
particle in $AdS$ metric. With appropriate gauge choice to fix the
reparameterization invariance, we recover the previously discussed \cite{pal}
"Exotic Oscillator". The Snyder algebra and subsequently the
$\kappa$-Minkowski spacetime are also derived. Lastly we comment on the
impossibility of constructing a noncommutative spacetime in the context of open
string where only a curved target space is introduced.
| [
{
"created": "Fri, 10 Jun 2005 11:06:28 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jun 2005 06:58:51 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Jul 2005 05:15:27 GMT",
"version": "v3"
}
] | 2016-09-06 | [
[
"Ghosh",
"Subir",
"",
"Indian Statistical Institute"
]
] | In this note we have considered a relativistic Nambu-Goto model for a particle in $AdS$ metric. With appropriate gauge choice to fix the reparameterization invariance, we recover the previously discussed \cite{pal} "Exotic Oscillator". The Snyder algebra and subsequently the $\kappa$-Minkowski spacetime are also derived. Lastly we comment on the impossibility of constructing a noncommutative spacetime in the context of open string where only a curved target space is introduced. |
hep-th/9703106 | Billy D. Jones | Billy D. Jones | Singlet-Triplet Splitting of Positronium in Light-Front QED | 9 pages, Latex | "25th Coral Gables Conference on High Energy Physics and
Cosmology" (Plenum Press,1997). | null | null | hep-th hep-ph | null | We study the QED bound-state problem in a light-front hamiltonian approach.
It is important to establish the equivalence (or not) of equal-time and
light-front approaches in the well-understood arena of Quantum Electrodynamics.
Along these lines, the singlet-triplet ground state spin splitting in
positronium is calculated. The well-known result, $(7/6) \alpha^2 Ryd$, is
obtained analytically, which establishes the equivalence between the equal-time
and light-front approaches (at least to this order). The true equivalence of
the two approaches can only be established after higher-order calculations. It
was previously shown that this light-front result could be obtained
analytically, but a simpler method is presented in this paper.
| [
{
"created": "Fri, 14 Mar 1997 15:44:21 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Jones",
"Billy D.",
""
]
] | We study the QED bound-state problem in a light-front hamiltonian approach. It is important to establish the equivalence (or not) of equal-time and light-front approaches in the well-understood arena of Quantum Electrodynamics. Along these lines, the singlet-triplet ground state spin splitting in positronium is calculated. The well-known result, $(7/6) \alpha^2 Ryd$, is obtained analytically, which establishes the equivalence between the equal-time and light-front approaches (at least to this order). The true equivalence of the two approaches can only be established after higher-order calculations. It was previously shown that this light-front result could be obtained analytically, but a simpler method is presented in this paper. |
hep-ph/9607268 | Maria Krawczyk | Maria Krawczyk (Institute of Theoretical Physics, University of
Warsaw) | Two Higgs Doublet Models | 6 pages, Invited Talk at the XXXIst Rencontres de Moriond, EW and
Unified Theories, Les Arcs, March 16-23, 1996 | null | null | IFT 15/96 | hep-ph | null | Present data do not rule out the light neutral Higgs particle $h$ or $A$ in
the framework of the general 2HDM. The discovery reach/exclusion limits of the
Yukawa process $Z\rightarrow f {\bar f} h/A$, ($f= b$ quark or $\tau$ lepton)
at LEP I and of the gluon-gluon fusion at HERA is discussed. In addition the
possible search for very light Higgs particle in $\gamma \gamma$ fusion at low
energy NLC is described.
| [
{
"created": "Tue, 9 Jul 1996 16:18:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Krawczyk",
"Maria",
"",
"Institute of Theoretical Physics, University of\n Warsaw"
]
] | Present data do not rule out the light neutral Higgs particle $h$ or $A$ in the framework of the general 2HDM. The discovery reach/exclusion limits of the Yukawa process $Z\rightarrow f {\bar f} h/A$, ($f= b$ quark or $\tau$ lepton) at LEP I and of the gluon-gluon fusion at HERA is discussed. In addition the possible search for very light Higgs particle in $\gamma \gamma$ fusion at low energy NLC is described. |
hep-ph/0103283 | Jean-Marc Richard | Andre Martin (CERN) and Jean-Marc Richard (Grenoble) | Investigation of the Role of Elastic Unitarity in High-Energy
Scattering: Gribov's Theorem and the Froissart Bound | 11 pages, 1 figures, latex with sproc.sty | null | null | CERN-TH/2001-086, ISN-01-026 | hep-ph | null | We re-examine V. Gribov's theorem of 1960 according to which the total
cross-section cannot approach a finite non-zero limit with, at the same time, a
diffraction peak having a finite slope. We are very close to proving by an
explicit counter-example that elastic unitarity in the elastic region is an
essential ingredient of the proof. By analogy, we raise the question of the
saturation of the Froissart-Martin bound, for which no examples incorporating
elastic unitarity exist at the present time.
| [
{
"created": "Tue, 27 Mar 2001 13:09:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Martin",
"Andre",
"",
"CERN"
],
[
"Richard",
"Jean-Marc",
"",
"Grenoble"
]
] | We re-examine V. Gribov's theorem of 1960 according to which the total cross-section cannot approach a finite non-zero limit with, at the same time, a diffraction peak having a finite slope. We are very close to proving by an explicit counter-example that elastic unitarity in the elastic region is an essential ingredient of the proof. By analogy, we raise the question of the saturation of the Froissart-Martin bound, for which no examples incorporating elastic unitarity exist at the present time. |
0809.0842 | Robert Fleischer | Sven Faller, Robert Fleischer, Martin Jung, Thomas Mannel | The Golden Modes B^0 -> J/psi K_{S,L} in the Era of Precision Flavour
Physics | 4+1 pages, 4 figures | Phys.Rev.D79:014030,2009 | 10.1103/PhysRevD.79.014030 | CERN-PH-TH/2008-166, SI-HEP-2008-12 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The B^0 -> J/\psi K_{S,L} channels are outstanding probes of CP violation. We
have a detailed look at the associated Standard-Model uncertainties, which are
related to doubly Cabibbo-suppressed penguin contributions, and point out that
these usually neglected effects can actually be taken into account
unambiguously through the CP asymmetries and the branching ratio of the B^0 ->
J/\psi pi^0 decay. Using the most recent B-factory measurements, we find a
negative shift of the extracted value of beta, which softens the tension in the
fits of the unitarity triangle. In addition, this strategy can be used to
constrain a possible new-physics phase in B^0-\bar B^0 mixing. The proposed
strategy is crucial to fully exploit the tremendous accuracies for the search
for this kind of new physics that can be achieved at the LHC and future
super-flavour factories.
| [
{
"created": "Thu, 4 Sep 2008 15:37:09 GMT",
"version": "v1"
}
] | 2009-02-26 | [
[
"Faller",
"Sven",
""
],
[
"Fleischer",
"Robert",
""
],
[
"Jung",
"Martin",
""
],
[
"Mannel",
"Thomas",
""
]
] | The B^0 -> J/\psi K_{S,L} channels are outstanding probes of CP violation. We have a detailed look at the associated Standard-Model uncertainties, which are related to doubly Cabibbo-suppressed penguin contributions, and point out that these usually neglected effects can actually be taken into account unambiguously through the CP asymmetries and the branching ratio of the B^0 -> J/\psi pi^0 decay. Using the most recent B-factory measurements, we find a negative shift of the extracted value of beta, which softens the tension in the fits of the unitarity triangle. In addition, this strategy can be used to constrain a possible new-physics phase in B^0-\bar B^0 mixing. The proposed strategy is crucial to fully exploit the tremendous accuracies for the search for this kind of new physics that can be achieved at the LHC and future super-flavour factories. |
1311.6457 | Viktor G. Czinner | Viktor G. Czinner | Axisymmetric Dirac-Nambu-Goto branes on Myers-Perry black hole
backgrounds | 8 pages, 4 figures, to be published in Phys. Rev. D | Phys. Rev. D 88, 124029 (2013) | 10.1103/PhysRevD.88.124029 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Stationary, D-dimensional test branes, interacting with N-dimensional
Myers-Perry bulk black holes, are investigated in arbitrary brane and bulk
dimensions. The branes are asymptotically flat and axisymmetric around the
rotation axis of the black hole with a single angular momentum. They are also
spherically symmetric in all other dimensions allowing a total of O(1)xO(D-2)
group of symmetry. It is shown that even though this setup is the most natural
extension of the spherical symmetric problem to the simplest rotating case in
higher dimensions, the obtained solutions are not compatible with the spherical
solutions in the sense that the latter ones are not recovered in the
non-rotating limit. The brane configurations are qualitatively different from
the spherical problem, except in the special case of a 3-dimensional brane.
Furthermore, a quasi-static phase transition between the topologically
different solutions cannot be studied here, due to the lack of a general,
stationary, equatorial solution.
| [
{
"created": "Mon, 25 Nov 2013 20:54:08 GMT",
"version": "v1"
}
] | 2013-12-12 | [
[
"Czinner",
"Viktor G.",
""
]
] | Stationary, D-dimensional test branes, interacting with N-dimensional Myers-Perry bulk black holes, are investigated in arbitrary brane and bulk dimensions. The branes are asymptotically flat and axisymmetric around the rotation axis of the black hole with a single angular momentum. They are also spherically symmetric in all other dimensions allowing a total of O(1)xO(D-2) group of symmetry. It is shown that even though this setup is the most natural extension of the spherical symmetric problem to the simplest rotating case in higher dimensions, the obtained solutions are not compatible with the spherical solutions in the sense that the latter ones are not recovered in the non-rotating limit. The brane configurations are qualitatively different from the spherical problem, except in the special case of a 3-dimensional brane. Furthermore, a quasi-static phase transition between the topologically different solutions cannot be studied here, due to the lack of a general, stationary, equatorial solution. |
2211.16438 | Donal O'Connell | Andrea Cristofoli, Asaad Elkhidir, Anton Ilderton and Donal O'Connell | Large Gauge Effects and the Structure of Amplitudes | 41 pages, one tikz figure | null | 10.1007/JHEP06(2023)204 | null | hep-th gr-qc | http://creativecommons.org/licenses/by/4.0/ | We show that large gauge transformations modify the structure of momentum
conservation leading to non-vanishing three-point amplitudes in a simple toy
model of a gravitational wave event. This phenomenon resolves an apparent
tension between perturbative scattering amplitude computations and exact
methods in field theory. The tension is resolved to all orders of perturbation
theory once large gauge effects are included via a modified LSZ prescription;
if they are omitted, perturbative methods only recover a subset of terms in the
full non-perturbative expression. Although our results are derived in the
context of specific examples, several aspects of our work have analogues in
dynamical gravitational scattering processes.
| [
{
"created": "Tue, 29 Nov 2022 18:08:51 GMT",
"version": "v1"
}
] | 2023-07-26 | [
[
"Cristofoli",
"Andrea",
""
],
[
"Elkhidir",
"Asaad",
""
],
[
"Ilderton",
"Anton",
""
],
[
"O'Connell",
"Donal",
""
]
] | We show that large gauge transformations modify the structure of momentum conservation leading to non-vanishing three-point amplitudes in a simple toy model of a gravitational wave event. This phenomenon resolves an apparent tension between perturbative scattering amplitude computations and exact methods in field theory. The tension is resolved to all orders of perturbation theory once large gauge effects are included via a modified LSZ prescription; if they are omitted, perturbative methods only recover a subset of terms in the full non-perturbative expression. Although our results are derived in the context of specific examples, several aspects of our work have analogues in dynamical gravitational scattering processes. |
1210.4175 | Alberto Guijosa | J. Antonio Garcia, Alberto Guijosa, Eric J. Pulido (ICN-UNAM) | No Line on the Horizon: On Uniform Acceleration and Gluonic Fields at
Strong Coupling | 1+24 pages, 11 figures; v2: minor changes, including addition of
footnote 4 | null | 10.1007/JHEP01(2013)096 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a few assorted questions about the behavior of strings on anti-de
Sitter spacetime (AdS), or equivalently, `flux tubes' in strongly-coupled
conformal field theories (CFTs). For the case where the `flux tube' is sourced
by a uniformly accelerated quark (or, more generally, a quark that asymptotes
to uniform acceleration in the remote past), we point out that the dual string
embedding known heretofore terminates unphysically at the worldsheet horizon,
and identify the correct continuation, which is found to encode a gluonic shock
wave. For arbitrary quark motion, we show that, contrary to common
understanding, the worldsheet horizon does not in general represent a dividing
line between the portions of the string respectively dual to the quark and to
the gluonic radiation emitted by it.
| [
{
"created": "Mon, 15 Oct 2012 20:00:50 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Oct 2012 21:41:41 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Garcia",
"J. Antonio",
"",
"ICN-UNAM"
],
[
"Guijosa",
"Alberto",
"",
"ICN-UNAM"
],
[
"Pulido",
"Eric J.",
"",
"ICN-UNAM"
]
] | We study a few assorted questions about the behavior of strings on anti-de Sitter spacetime (AdS), or equivalently, `flux tubes' in strongly-coupled conformal field theories (CFTs). For the case where the `flux tube' is sourced by a uniformly accelerated quark (or, more generally, a quark that asymptotes to uniform acceleration in the remote past), we point out that the dual string embedding known heretofore terminates unphysically at the worldsheet horizon, and identify the correct continuation, which is found to encode a gluonic shock wave. For arbitrary quark motion, we show that, contrary to common understanding, the worldsheet horizon does not in general represent a dividing line between the portions of the string respectively dual to the quark and to the gluonic radiation emitted by it. |
1204.3802 | Sujay Ashok | Sujay K. Ashok and Jan Troost | Elliptic Genera of Non-compact Gepner Models and Mirror Symmetry | 29 pages | null | 10.1007/JHEP07(2012)005 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider tensor products of N=2 minimal models and non-compact conformal
field theories with N=2 superconformal symmetry, and their orbifolds. The
elliptic genera of these models give rise to a large and interesting class of
real Jacobi forms. The tensor product of conformal field theories leads to a
natural product on the space of completed mock modular forms. We exhibit
families of non-compact mirror pairs of orbifold models with c=9 and show
explicitly the equality of elliptic genera, including contributions from the
long multiplet sector. The Liouville and cigar deformed elliptic genera
transform into each other under the mirror transformation.
| [
{
"created": "Tue, 17 Apr 2012 14:37:52 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jun 2012 02:05:08 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Ashok",
"Sujay K.",
""
],
[
"Troost",
"Jan",
""
]
] | We consider tensor products of N=2 minimal models and non-compact conformal field theories with N=2 superconformal symmetry, and their orbifolds. The elliptic genera of these models give rise to a large and interesting class of real Jacobi forms. The tensor product of conformal field theories leads to a natural product on the space of completed mock modular forms. We exhibit families of non-compact mirror pairs of orbifold models with c=9 and show explicitly the equality of elliptic genera, including contributions from the long multiplet sector. The Liouville and cigar deformed elliptic genera transform into each other under the mirror transformation. |
gr-qc/0104047 | Juan Eloy Ayon Beato | Eloy Ay\'on-Beato, Alberto Garc\'ia, Alfredo Mac\'ias, Hernando
Quevedo | Static Black Holes of Metric-Affine Gravity in the Presence of Matter | 19 pages, RevTex, accepted for publication in Phys. Rev. D;
duplication of refs. corrected | Phys.Rev.D64:024026,2001 | 10.1103/PhysRevD.64.024026 | null | gr-qc | null | We investigate spherically symmetric and static gravitational fields
representing black hole configurations in the framework of metric-affine gauge
theories of gravity (MAG) in the presence of different matter fields. It is
shown that in the triplet ansatz sector of MAG, black hole configurations in
the presence of non-Abelian matter fields allow the existence of black hole
hair. We analyze several cases of matter fields characterized by the presence
of hair and for all of them we show the validity of the no short hair
conjecture.
| [
{
"created": "Mon, 16 Apr 2001 20:25:22 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Apr 2001 19:28:26 GMT",
"version": "v2"
}
] | 2016-08-16 | [
[
"Ayón-Beato",
"Eloy",
""
],
[
"García",
"Alberto",
""
],
[
"Macías",
"Alfredo",
""
],
[
"Quevedo",
"Hernando",
""
]
] | We investigate spherically symmetric and static gravitational fields representing black hole configurations in the framework of metric-affine gauge theories of gravity (MAG) in the presence of different matter fields. It is shown that in the triplet ansatz sector of MAG, black hole configurations in the presence of non-Abelian matter fields allow the existence of black hole hair. We analyze several cases of matter fields characterized by the presence of hair and for all of them we show the validity of the no short hair conjecture. |
gr-qc/9407007 | Dominik Schwarz | Dominik J. Schwarz | Exact Solutions for Cosmological Perturbations with Collisionless Matter | 4 pp., LaTeX, 2 figures (postscript), TUW-94-11 | null | 10.1007/3-540-60024-8_96 | null | gr-qc astro-ph | null | All regular and singular cosmological perturbations in a radiation dominated
Einstein-de Sitter Universe with collisionless particles can be found by a
generalized power series ansatz. Talk given at "Birth of the Universe and
Fundamental Physics", May 1994 (Rome).
| [
{
"created": "Mon, 11 Jul 1994 16:04:50 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Schwarz",
"Dominik J.",
""
]
] | All regular and singular cosmological perturbations in a radiation dominated Einstein-de Sitter Universe with collisionless particles can be found by a generalized power series ansatz. Talk given at "Birth of the Universe and Fundamental Physics", May 1994 (Rome). |
hep-th/0006193 | Jianxin Lu | J. X. Lu (U. of Michigan), S. Roy (Saha Institute), H. Singh (Saha
Institute) | ((F, D1), D3) bound state, S-duality and noncommutative open
string/Yang-Mills theory | Final version to appear in JHEP. Changes include the extended
discussion of NCOS (NCYM) decoupling from closed strings and gravity and
arguing the equivalence of some scaling limits | JHEP 0009 (2000) 020 | 10.1088/1126-6708/2000/09/020 | UM-TH-00-11, SINP/TNP/00-15 | hep-th | null | We study decoupling limits and S-dualities for noncommutative open string/
Yang-Mills theory in a gravity setup by considering an $SL(2,Z)$ invariant
supergravity solution of the form ((F, D1), D3) bound state of type IIB string
theory. This configuration can be regarded as D3-branes with both electric and
magnetic fields turned on along one of the spatial directions of the brane and
preserves half of the space-time supersymmetries of the string theory. Our
study indicates that there exists a decoupling limit for which the resulting
theory is an open string theory defined in a geometry with noncommutativity in
both space-time and space-space directions. We study S-duality of this
noncommutative open string (NCOS) and find that the same decoupling limit in
the S-dual description gives rise to a space-space noncommutative Yang-Mills
theory (NCYM). We also discuss independently the decoupling limit for NCYM in
this D3 brane background. Here we find that S-duality of NCYM theory does not
always give a NCOS theory. Instead, it can give an ordinary Yang-Mills with a
singular metric and an infinitely large coupling. We also find that the open
string coupling relation between the two S-duality related theories is modified
such that S-duality of a strongly coupled open-string/Yang-Mills theory does
not necessarily give a weakly coupled theory. The relevant gravity dual
descriptions of NCOS/NCYM are also given.
| [
{
"created": "Mon, 26 Jun 2000 15:24:09 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Jun 2000 20:43:28 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Sep 2000 14:30:05 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Lu",
"J. X.",
"",
"U. of Michigan"
],
[
"Roy",
"S.",
"",
"Saha Institute"
],
[
"Singh",
"H.",
"",
"Saha\n Institute"
]
] | We study decoupling limits and S-dualities for noncommutative open string/ Yang-Mills theory in a gravity setup by considering an $SL(2,Z)$ invariant supergravity solution of the form ((F, D1), D3) bound state of type IIB string theory. This configuration can be regarded as D3-branes with both electric and magnetic fields turned on along one of the spatial directions of the brane and preserves half of the space-time supersymmetries of the string theory. Our study indicates that there exists a decoupling limit for which the resulting theory is an open string theory defined in a geometry with noncommutativity in both space-time and space-space directions. We study S-duality of this noncommutative open string (NCOS) and find that the same decoupling limit in the S-dual description gives rise to a space-space noncommutative Yang-Mills theory (NCYM). We also discuss independently the decoupling limit for NCYM in this D3 brane background. Here we find that S-duality of NCYM theory does not always give a NCOS theory. Instead, it can give an ordinary Yang-Mills with a singular metric and an infinitely large coupling. We also find that the open string coupling relation between the two S-duality related theories is modified such that S-duality of a strongly coupled open-string/Yang-Mills theory does not necessarily give a weakly coupled theory. The relevant gravity dual descriptions of NCOS/NCYM are also given. |
hep-ph/9812370 | Catherine Bourge | Michel Davier | Evaluation of $\alpha(M_{\rm Z}^2)$ and $(g-2)_\mu$ | 13 pages | Nucl.Phys.Proc.Suppl. 76 (1999) 327-338 | 10.1016/S0920-5632(99)00486-7 | LAL 98-87 | hep-ph | null | This talk summarizes the recent developments in the evaluation of the leading
order hadronic contributions to the running of the QED fine structure constant
$\alpha(s)$, at $s=M_{\rm Z}^2$, and to the anomalous magnetic moment of the
muon $(g-2)_\mu$. The accuracy of the theoretical prediction of these
observables is limited by the uncertainties on the hadronic contributions.
Significant improvement has been achieved in a series of new analyses which is
presented historically in three steps: (I), use of $\tau$ spectral functions in
addition to $e^+e^-$ cross sections, (II), extended use of perturbative QCD and
(III), application of QCD sum rule techniques. The most precise values obtained
are: $\Delta\alpha_{\rm had}(M_{\rm Z}^2)$, $=(276.3\pm1.6)\times10^{-4}$,
yielding $\alpha^{-1}(M_{\rm Z}^2)=128.933\pm0.021$, and $a_\mu^{\rm
had}=(692.4\pm6.2)\times 10^{-10}$ with which one finds for the complete
Standard Model prediction $a_\mu^{\rm SM}=(11 659 159.6\pm6.7)\times10^{-10}$.
For the electron $(g-2)_e$, the hadronic contribution is $a_e^{\rm
had}=(187.5\pm1.8)\times 10^{-14}$.
| [
{
"created": "Tue, 15 Dec 1998 15:32:58 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Dec 1998 10:01:31 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Davier",
"Michel",
""
]
] | This talk summarizes the recent developments in the evaluation of the leading order hadronic contributions to the running of the QED fine structure constant $\alpha(s)$, at $s=M_{\rm Z}^2$, and to the anomalous magnetic moment of the muon $(g-2)_\mu$. The accuracy of the theoretical prediction of these observables is limited by the uncertainties on the hadronic contributions. Significant improvement has been achieved in a series of new analyses which is presented historically in three steps: (I), use of $\tau$ spectral functions in addition to $e^+e^-$ cross sections, (II), extended use of perturbative QCD and (III), application of QCD sum rule techniques. The most precise values obtained are: $\Delta\alpha_{\rm had}(M_{\rm Z}^2)$, $=(276.3\pm1.6)\times10^{-4}$, yielding $\alpha^{-1}(M_{\rm Z}^2)=128.933\pm0.021$, and $a_\mu^{\rm had}=(692.4\pm6.2)\times 10^{-10}$ with which one finds for the complete Standard Model prediction $a_\mu^{\rm SM}=(11 659 159.6\pm6.7)\times10^{-10}$. For the electron $(g-2)_e$, the hadronic contribution is $a_e^{\rm had}=(187.5\pm1.8)\times 10^{-14}$. |
End of preview. Expand
in Data Studio
Dataset Card for hep-th_hep-ph_gr-qc_primary Dataset
Dataset Summary
This dataset contains metadata included in arXiv submissions.
Dataset Structure
An example from the dataset looks as follows:
{'id': '0908.2896',
'submitter': 'Paul Richmond',
'authors': 'Neil Lambert, Paul Richmond',
'title': 'M2-Branes and Background Fields',
'comments': '19 pages',
'journal-ref': 'JHEP 0910:084,2009',
'doi': '10.1088/1126-6708/2009/10/084',
'report-no': None,
'categories': 'hep-th',
'license': 'http://arxiv.org/licenses/nonexclusive-distrib/1.0/',
'abstract': ' We discuss the coupling of multiple M2-branes to the background 3-form and\n6-form gauge fields of eleven-dimensional supergravity, including the coupling\nof the Fermions. In particular we show in detail how a natural generalization\nof the Myers flux-terms, along with the resulting curvature of the background\nmetric, leads to mass terms in the effective field theory.\n',
'versions': [{'created': 'Thu, 20 Aug 2009 14:23:37 GMT', 'version': 'v1'}],
'update_date': '2009-11-09',
'authors_parsed': [['Lambert', 'Neil', ''], ['Richmond', 'Paul', '']]}
Languages
The text in the abstract field of the dataset is in English, however there may be examples
where the abstract also contains a translation into another language.
Dataset Creation
Curation Rationale
The starting point was to load v193 of the Kaggle arXiv Dataset which includes arXiv submissions upto 23rd August 2024. The arXiv dataset contains the following data fields:
id: ArXiv ID (can be used to access the paper)submitter: Who submitted the paperauthors: Authors of the papertitle: Title of the papercomments: Additional info, such as number of pages and figuresjournal-ref: Information about the journal the paper was published indoi: Digital Object Identifierreport-no: Report Numberabstract: The abstract of the papercategories: Categories / tags in the ArXiv system
To arrive at the hep-th_hep-ph_gr-qc_primary dataset, the full arXiv data
was filtered so that only categories which included 'hep-th', 'hep-ph' or 'gr-qc' were retained.
This resulted in papers that were either primarily classified as 'hep-th', 'hep-ph' or 'gr-qc' or appeared cross-listed.
For this dataset, the decision was made to focus only on papers primarily classified as any of 'hep-th', 'hep-ph' or 'gr-qc'.
This meant taking only those abstracts where the first characters in categories were any of 'hep-th', 'hep-ph' or 'gr-qc'
(see here for more details).
We also dropped entries whose abstract or comments contained the word 'Withdrawn' or 'withdrawn' and we removed the five records which appear in the repo LLMsForHepth/arxiv_hepth_first_overfit.
In addition, we have cleaned the data appearing in abstract by first replacing all occurences of '\n' with a whitespace and then removing any leading and trailing whitespace.
Data splits
The dataset is split into a training, validation and test set with split percentages 70%, 15% and 15%. This was done by applying train_test_split twice (both with seed=42).
The final split sizes are as follows:
| Train | Test | Validation |
|---|---|---|
| 210,905 | 45,194 | 45,194 |
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