LLMsForHepth/s9-L-3.1-8B-base
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2005.08828
|
Diego Rubiera-Garcia
|
Merce Guerrero, Diego Rubiera-Garcia
|
Nonsingular black holes in nonlinear gravity coupled to Euler-Heisenberg
electrodynamics
|
14 pages, 8 figures, revtex4-1 style. v2: some new discussion and
minor corrections. Version to appear in Phys. Rev. D
|
Phys. Rev. D 102, 024005 (2020)
|
10.1103/PhysRevD.102.024005
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study static, spherically symmetric black holes supported by
Euler-Heisenberg theory of electrodynamics and coupled to two different
modified theories of gravity. Such theories are the quadratic $f(R)$ model and
Eddington-inspired Born-Infeld gravity, both formulated in metric-affine
spaces, where metric and affine connection are independent fields. We find
exact solutions of the corresponding field equations in both cases,
characterized by mass, charge, the Euler-Heisenberg coupling parameter and the
modified gravity one. For each such family of solutions, we characterize its
horizon structure and the modifications in the innermost region, finding that
some subclasses are geodesically complete. The singularity regularization is
achieved under two different mechanisms: either the boundary of the manifold is
pushed to an infinite affine distance, not being able to be reached in finite
time by any geodesic, or the presence of a wormhole structure allows for the
smooth extension of all geodesics overcoming the maximum of the potential
barrier.
|
[
{
"created": "Mon, 18 May 2020 15:59:03 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jun 2020 06:24:34 GMT",
"version": "v2"
}
] |
2020-07-08
|
[
[
"Guerrero",
"Merce",
""
],
[
"Rubiera-Garcia",
"Diego",
""
]
] |
We study static, spherically symmetric black holes supported by Euler-Heisenberg theory of electrodynamics and coupled to two different modified theories of gravity. Such theories are the quadratic $f(R)$ model and Eddington-inspired Born-Infeld gravity, both formulated in metric-affine spaces, where metric and affine connection are independent fields. We find exact solutions of the corresponding field equations in both cases, characterized by mass, charge, the Euler-Heisenberg coupling parameter and the modified gravity one. For each such family of solutions, we characterize its horizon structure and the modifications in the innermost region, finding that some subclasses are geodesically complete. The singularity regularization is achieved under two different mechanisms: either the boundary of the manifold is pushed to an infinite affine distance, not being able to be reached in finite time by any geodesic, or the presence of a wormhole structure allows for the smooth extension of all geodesics overcoming the maximum of the potential barrier.
|
2212.10739
|
Yuki Watanabe
|
Shigeki Matsumoto, Yu Watanabe, Yuki Watanabe and Graham White
|
Decay of the Mediator Particle at Threshold
|
25 pages, 6 figures
| null | null | null |
hep-ph cs.NA math.NA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A light mediator particle is often predicted in the dark sector scenario,
which weakly interacts with the standard model (SM) particles. The weakness of
the interaction is usually described by a small coupling; however, the small
coupling does not always guarantee the weakness of the interaction. When the
mass of the mediator particle lies in a threshold region, the so-called
threshold singularity may emerge, and then the perturbative calculation fails.
This singularity causes several effects, e.g., the mixing between the mediator
particle and bound states, the Sommerfeld effect on the final state of the
mediator particle decay, etc. Taking the minimal model of the vector mediator
particle decaying mainly into the SM particles as an example, we develop a
method to describe the singularity quantitatively. We also calculate some
physical quantities using this method, such as the lifetime of the mediator
particle, and find that those could be significantly altered compared with the
result of the perturbative calculation.
|
[
{
"created": "Wed, 21 Dec 2022 03:19:46 GMT",
"version": "v1"
}
] |
2023-10-16
|
[
[
"Matsumoto",
"Shigeki",
""
],
[
"Watanabe",
"Yu",
""
],
[
"Watanabe",
"Yuki",
""
],
[
"White",
"Graham",
""
]
] |
A light mediator particle is often predicted in the dark sector scenario, which weakly interacts with the standard model (SM) particles. The weakness of the interaction is usually described by a small coupling; however, the small coupling does not always guarantee the weakness of the interaction. When the mass of the mediator particle lies in a threshold region, the so-called threshold singularity may emerge, and then the perturbative calculation fails. This singularity causes several effects, e.g., the mixing between the mediator particle and bound states, the Sommerfeld effect on the final state of the mediator particle decay, etc. Taking the minimal model of the vector mediator particle decaying mainly into the SM particles as an example, we develop a method to describe the singularity quantitatively. We also calculate some physical quantities using this method, such as the lifetime of the mediator particle, and find that those could be significantly altered compared with the result of the perturbative calculation.
|
1105.0792
|
O. V. Kancheli
|
O.V. Kancheli
|
On the Multi-Component Pomeron in high energy hadronic interactions
|
19 pages
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the phenomenon of regge cut splitting, corresponding to the BFKL
pomeron into an infinite sequence of regge-poles, which happens when one takes
into account the running of QCD coupling with scale. The first members of this
sequence, after adjusting their parameters, can effectively include the
nonperturbative part of pomeron, and by this way all pomeron components - soft
and hard can be treated in a unique way.
|
[
{
"created": "Wed, 4 May 2011 11:23:50 GMT",
"version": "v1"
}
] |
2011-05-05
|
[
[
"Kancheli",
"O. V.",
""
]
] |
We consider the phenomenon of regge cut splitting, corresponding to the BFKL pomeron into an infinite sequence of regge-poles, which happens when one takes into account the running of QCD coupling with scale. The first members of this sequence, after adjusting their parameters, can effectively include the nonperturbative part of pomeron, and by this way all pomeron components - soft and hard can be treated in a unique way.
|
gr-qc/0209042
|
Christodoulakis Theodosios
|
T. Christodoulakis, G.O. Papadopoulos, A. Dimakis
|
Automorphisms of Real 4 Dimensional Lie Algebras and the Invariant
Characterization of Homogeneous 4-Spaces
|
LaTeX2e, 23 pages, 2 Tables. To appear in Journal of Physics A:
Mathematical & General
|
J.Phys.A36:427-442,2003
|
10.1088/0305-4470/36/2/310
| null |
gr-qc math-ph math.MP
| null |
The automorphisms of all 4-dimensional, real Lie Algebras are presented in a
comprehensive way. Their action on the space of $4\times 4$, real, symmetric
and positive definite, matrices, defines equivalence classes which are used for
the invariant characterization of the 4-dimensional homogeneous spaces which
possess an invariant basis.
|
[
{
"created": "Thu, 12 Sep 2002 09:47:37 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Nov 2002 12:05:55 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Christodoulakis",
"T.",
""
],
[
"Papadopoulos",
"G. O.",
""
],
[
"Dimakis",
"A.",
""
]
] |
The automorphisms of all 4-dimensional, real Lie Algebras are presented in a comprehensive way. Their action on the space of $4\times 4$, real, symmetric and positive definite, matrices, defines equivalence classes which are used for the invariant characterization of the 4-dimensional homogeneous spaces which possess an invariant basis.
|
2204.08202
|
Chengcheng Han
|
Neil D. Barrie, Chengcheng Han and Hitoshi Murayama
|
Type II Seesaw Leptogenesis
|
36 pages, 7 figures
| null |
10.1007/JHEP05(2022)160
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
The Type II Seesaw Mechanism provides a minimal framework to explain the
neutrino masses involving the introduction of a single triplet Higgs to the
Standard Model. However, this simple extension was believed to be unable to
successfully explain the observed baryon asymmetry of the universe through
Leptogenesis. In our previous work (Phys. Rev. Lett. 128, 141801), we
demonstrated that the triplet Higgs of the Type II Seesaw Mechanism alone can
simultaneously generate the observed baryon asymmetry of the universe and the
neutrino masses while playing a role in setting up Inflation. This is
achievable with a triplet Higgs mass as low as 1 TeV, and predicts that the
neutral component obtains a small vacuum expectation value $v_\Delta < 10 $
keV. We find that our model has very rich phenomenology and can be tested by
various terrestrial experiments as well as by astronomical observations.
Particularly, we show that the successful parameter region may be probed at a
future 100 TeV collider, upcoming lepton flavor violation experiments such as
Mu3e, and neutrinoless double beta decay experiments. Additionally, the
tensor-to-scalar ratio from the inflationary scenario will be probed by the
LiteBIRD telescope, and observable isocurvature perturbations may be produced
for some parameter choices. In this article, we present all the technical
details of our calculations and further discussion of its phenomenological
implications.
|
[
{
"created": "Mon, 18 Apr 2022 07:47:39 GMT",
"version": "v1"
}
] |
2022-06-08
|
[
[
"Barrie",
"Neil D.",
""
],
[
"Han",
"Chengcheng",
""
],
[
"Murayama",
"Hitoshi",
""
]
] |
The Type II Seesaw Mechanism provides a minimal framework to explain the neutrino masses involving the introduction of a single triplet Higgs to the Standard Model. However, this simple extension was believed to be unable to successfully explain the observed baryon asymmetry of the universe through Leptogenesis. In our previous work (Phys. Rev. Lett. 128, 141801), we demonstrated that the triplet Higgs of the Type II Seesaw Mechanism alone can simultaneously generate the observed baryon asymmetry of the universe and the neutrino masses while playing a role in setting up Inflation. This is achievable with a triplet Higgs mass as low as 1 TeV, and predicts that the neutral component obtains a small vacuum expectation value $v_\Delta < 10 $ keV. We find that our model has very rich phenomenology and can be tested by various terrestrial experiments as well as by astronomical observations. Particularly, we show that the successful parameter region may be probed at a future 100 TeV collider, upcoming lepton flavor violation experiments such as Mu3e, and neutrinoless double beta decay experiments. Additionally, the tensor-to-scalar ratio from the inflationary scenario will be probed by the LiteBIRD telescope, and observable isocurvature perturbations may be produced for some parameter choices. In this article, we present all the technical details of our calculations and further discussion of its phenomenological implications.
|
1611.03635
|
Newton Nath
|
Newton Nath, Monojit Ghosh, Srubabati Goswami
|
What antineutrinos can tell about octant and $\delta_{CP}$ in DUNE?
|
4 pages, 3 figures, Contribution to the proceedings of the 38th
International Conference on High Energy Physics (ICHEP 2016), Chicago, Aug.
3-10, 2016
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the efficiency of DUNE, a next generation long baseline oscillation
experiment to resolve two major unknowns in neutrino oscillation physics. These
are, octant of $\theta_{23}$ (i.e. if $\theta_{23}$ is $< 45^\circ$ or
$>45^\circ$) and Dirac CP phase $\delta_{CP}$. We mainly focus on the role of
antineutrinos when they travel 1300 km baseline of DUNE. We observe that for
DUNE, the antineutrino runs help to remove parameter degeneracies even in the
parameter space where the antineutrino probability suffers from various
degeneracies. We study these points in detail and find that, due to enhanced
matter effect longer baseline experiments create an increased tension between
the neutrino and the antineutrino probabilities which helps to increase total
sensitivity in case of combined runs. We also find that, antineutrino run
increases overall CP sensitivity due to its ability to abolish
octant-$\delta_{CP}$ degeneracy.
|
[
{
"created": "Fri, 11 Nov 2016 09:47:43 GMT",
"version": "v1"
}
] |
2016-11-14
|
[
[
"Nath",
"Newton",
""
],
[
"Ghosh",
"Monojit",
""
],
[
"Goswami",
"Srubabati",
""
]
] |
We study the efficiency of DUNE, a next generation long baseline oscillation experiment to resolve two major unknowns in neutrino oscillation physics. These are, octant of $\theta_{23}$ (i.e. if $\theta_{23}$ is $< 45^\circ$ or $>45^\circ$) and Dirac CP phase $\delta_{CP}$. We mainly focus on the role of antineutrinos when they travel 1300 km baseline of DUNE. We observe that for DUNE, the antineutrino runs help to remove parameter degeneracies even in the parameter space where the antineutrino probability suffers from various degeneracies. We study these points in detail and find that, due to enhanced matter effect longer baseline experiments create an increased tension between the neutrino and the antineutrino probabilities which helps to increase total sensitivity in case of combined runs. We also find that, antineutrino run increases overall CP sensitivity due to its ability to abolish octant-$\delta_{CP}$ degeneracy.
|
2104.02400
|
Sven-Olaf Moch
|
S. Alekhin, A. Kardos, S. Moch and Z. Tr\'ocs\'anyi
|
Precision studies for Drell-Yan processes at NNLO
|
24 pages LaTeX, 17 figures, (journal version)
| null |
10.1140/epjc/s10052-021-09361-9
|
DESY 21-002
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a detailed comparison of the fixed-order predictions computed by
four publicly available computer codes for Drell-Yan processes at the LHC and
Tevatron colliders. We point out that while there is agreement among the
predictions at the next-to-leading order accuracy, the predictions at the
next-to-next-to-leading order (NNLO) differ, whose extent depends on the
observable. The sizes of the differences in general are at least similar,
sometimes larger than the sizes of the NNLO corrections themselves. We
demonstrate that the neglected power corrections by the codes that use global
slicing methods for the regularization of double real emissions can be the
source of the differences. Depending on the fiducial cuts, those power
corrections become linear, hence enhanced as compared to quadratic ones that
are considered standard.
|
[
{
"created": "Tue, 6 Apr 2021 10:09:26 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Jun 2021 10:34:20 GMT",
"version": "v2"
}
] |
2021-07-21
|
[
[
"Alekhin",
"S.",
""
],
[
"Kardos",
"A.",
""
],
[
"Moch",
"S.",
""
],
[
"Trócsányi",
"Z.",
""
]
] |
We present a detailed comparison of the fixed-order predictions computed by four publicly available computer codes for Drell-Yan processes at the LHC and Tevatron colliders. We point out that while there is agreement among the predictions at the next-to-leading order accuracy, the predictions at the next-to-next-to-leading order (NNLO) differ, whose extent depends on the observable. The sizes of the differences in general are at least similar, sometimes larger than the sizes of the NNLO corrections themselves. We demonstrate that the neglected power corrections by the codes that use global slicing methods for the regularization of double real emissions can be the source of the differences. Depending on the fiducial cuts, those power corrections become linear, hence enhanced as compared to quadratic ones that are considered standard.
|
1311.5808
|
Matteo Luca Ruggiero
|
Matteo Luca Ruggiero
|
Using Ring Laser Systems to Measure Gravitomagnetic Effects on Earth
|
3 pages, in "QSO astrophysics, fundamental physics, and astrometric
cosmology in the Gaia era" Porto-Portugal, June 6-9, 2011, Editors: S. Anton,
M. Crosta, M.G. Lattanzi and A. Andrei. Memorie della Societ\`a Astronomica
Italiana, Vol. 83 (2012)
|
Memorie della Societ\`a Astronomica Italiana, Vol. 83 (2012),
Pages 1017-1019
| null | null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Gravitomagnetic effects originates from the rotation of the source of the
gravitational field and from the rotational features of the observers' frame.
In recent years, gravitomagnetism has been tested by means of its impact on the
precession of LAGEOS orbits and on the precession of spherical gyroscopes in
the GP-B experiment. What we suggest here is that light can be used as a probe
to test gravitomagnetic effects in an terrestrial laboratory: the proposed
detector consists of large ring-lasers arranged along three orthogonal axes.
|
[
{
"created": "Fri, 22 Nov 2013 16:45:28 GMT",
"version": "v1"
}
] |
2013-12-06
|
[
[
"Ruggiero",
"Matteo Luca",
""
]
] |
Gravitomagnetic effects originates from the rotation of the source of the gravitational field and from the rotational features of the observers' frame. In recent years, gravitomagnetism has been tested by means of its impact on the precession of LAGEOS orbits and on the precession of spherical gyroscopes in the GP-B experiment. What we suggest here is that light can be used as a probe to test gravitomagnetic effects in an terrestrial laboratory: the proposed detector consists of large ring-lasers arranged along three orthogonal axes.
|
1909.06320
|
Vsevolod Syvolap
|
Vsevolod Syvolap, Oleg Ruchayskiy, Alexey Boyarsky
|
Resonance production of keV sterile neutrinos in core-collapse
supernovae and lepton number diffusion
|
9 pages + Appendices, 13 figures
| null | null | null |
hep-ph astro-ph.CO astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate how hypothetical particles - sterile neutrinos - can be
produced in the interior of exploding supernovae via the resonant conversion of
$\bar\nu_\mu$ and $\bar \nu_\tau$. The novelty of our treatment lies in the
proper account of the resulting lepton number diffusion. We compute the yield
of sterile neutrinos and find that even after taking into account back
reaction, sterile neutrinos can carry out a sizeable fraction of the total
energy of the explosion comparable to that of active neutrinos. The production
is, however, exponentially sensitive to the temperature in the inner supernovae
regions, making robust predictions of challenging. In order to understand
whether this production affects supernova evolution and can therefore be
constrained, detailed simulations including the effects of sterile neutrinos
are needed.
|
[
{
"created": "Fri, 13 Sep 2019 16:36:13 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Dec 2022 09:23:55 GMT",
"version": "v2"
}
] |
2022-12-05
|
[
[
"Syvolap",
"Vsevolod",
""
],
[
"Ruchayskiy",
"Oleg",
""
],
[
"Boyarsky",
"Alexey",
""
]
] |
We investigate how hypothetical particles - sterile neutrinos - can be produced in the interior of exploding supernovae via the resonant conversion of $\bar\nu_\mu$ and $\bar \nu_\tau$. The novelty of our treatment lies in the proper account of the resulting lepton number diffusion. We compute the yield of sterile neutrinos and find that even after taking into account back reaction, sterile neutrinos can carry out a sizeable fraction of the total energy of the explosion comparable to that of active neutrinos. The production is, however, exponentially sensitive to the temperature in the inner supernovae regions, making robust predictions of challenging. In order to understand whether this production affects supernova evolution and can therefore be constrained, detailed simulations including the effects of sterile neutrinos are needed.
|
2305.06992
|
Yuxun Guo
|
Yuxun Guo, Xiangdong Ji, Yizhuang Liu and Jinghong Yang
|
Updated analysis of near-threshold heavy quarkonium production for probe
of proton's gluonic gravitational form factors
|
8 figures, 2 tables
| null |
10.1103/PhysRevD.108.034003
| null |
hep-ph hep-lat nucl-ex
|
http://creativecommons.org/publicdomain/zero/1.0/
|
There has been growing interest in the near-threshold production of heavy
quarkonium which can access the gluonic structure in the nucleon. Previously we
studied this process with quantum chromodynamics (QCD) and showed that it can
be factorized with the gluon generalized parton distributions (GPDs) in the
heavy quark limit. We further argued that the hadronic matrix element is
dominated by its leading moments corresponding to the gluonic gravitational
form factors (GFFs) in this limit. Since then, there have been many new
developments on this subject. More experimental measurements have been made and
published, and the lattice simulation of gluonic GFFs has been improved as
well. In this work, we make an important revision to a previous result and
perform an updated analysis with the new inputs. We also study the importance
of the large momentum transfer to extract these gluonic structures reliably in
this framework.
|
[
{
"created": "Thu, 11 May 2023 17:28:12 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Jul 2023 21:29:37 GMT",
"version": "v2"
}
] |
2023-08-16
|
[
[
"Guo",
"Yuxun",
""
],
[
"Ji",
"Xiangdong",
""
],
[
"Liu",
"Yizhuang",
""
],
[
"Yang",
"Jinghong",
""
]
] |
There has been growing interest in the near-threshold production of heavy quarkonium which can access the gluonic structure in the nucleon. Previously we studied this process with quantum chromodynamics (QCD) and showed that it can be factorized with the gluon generalized parton distributions (GPDs) in the heavy quark limit. We further argued that the hadronic matrix element is dominated by its leading moments corresponding to the gluonic gravitational form factors (GFFs) in this limit. Since then, there have been many new developments on this subject. More experimental measurements have been made and published, and the lattice simulation of gluonic GFFs has been improved as well. In this work, we make an important revision to a previous result and perform an updated analysis with the new inputs. We also study the importance of the large momentum transfer to extract these gluonic structures reliably in this framework.
|
1105.2425
|
Barun Majumder
|
Barun Majumder
|
The Generalized Uncertainty Principle and the Friedmann equations
|
6 pages, accepted for publication in Astrophysics and Space Science
|
Astrophysics and Space Science, 336, 2, 331-335 (2011)
|
10.1007/s10509-011-0815-6
| null |
gr-qc astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Generalized Uncertainty Principle (or GUP) affects the dynamics in Plank
scale. So the known equations of physics are expected to get modified at that
very high energy regime. Very recently authors in (Ali et al. 2009) proposed a
new Generalized Uncertainty Principle (or GUP) with a linear term in Plank
length. In this article, the proposed GUP is expressed in a more general form
and the effect is studied for the modification of the Friedmann equations of
the FRW universe. In the midway the known entropy-area relation get some new
correction terms, the leading order term being proportional to square root of
area.
|
[
{
"created": "Thu, 12 May 2011 11:04:43 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Jul 2011 14:10:07 GMT",
"version": "v2"
}
] |
2011-11-29
|
[
[
"Majumder",
"Barun",
""
]
] |
The Generalized Uncertainty Principle (or GUP) affects the dynamics in Plank scale. So the known equations of physics are expected to get modified at that very high energy regime. Very recently authors in (Ali et al. 2009) proposed a new Generalized Uncertainty Principle (or GUP) with a linear term in Plank length. In this article, the proposed GUP is expressed in a more general form and the effect is studied for the modification of the Friedmann equations of the FRW universe. In the midway the known entropy-area relation get some new correction terms, the leading order term being proportional to square root of area.
|
1005.3636
|
Wei-jie Fu
|
Wei-jie Fu, Da Huang, and Fa-bing Wang
|
Time-dependent Ginzburg-Landau Equation in the Nambu--Jona-Lasinio Model
|
20 pages, no figures. Version to appear in Nuclear Physics A
| null |
10.1016/j.nuclphysa.2010.11.004
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We apply the closed time-path Green function formalism in the
Nambu--Jona-Lasinio model. First of all, we use this formalism to obtain the
well-known gap equation for the quark condensate in a stationary homogeneous
system. We have also used this formalism to obtain the Ginzburg-Landau (GL)
equation and the time-dependent Ginzburg-Landau (TDGL) equation for the chiral
order parameter in an inhomogeneous system. In our derived GL and TDGL
equations, there is no other parameters except for those in the original NJL
model.
|
[
{
"created": "Thu, 20 May 2010 09:11:33 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Nov 2010 14:31:30 GMT",
"version": "v2"
}
] |
2015-05-19
|
[
[
"Fu",
"Wei-jie",
""
],
[
"Huang",
"Da",
""
],
[
"Wang",
"Fa-bing",
""
]
] |
We apply the closed time-path Green function formalism in the Nambu--Jona-Lasinio model. First of all, we use this formalism to obtain the well-known gap equation for the quark condensate in a stationary homogeneous system. We have also used this formalism to obtain the Ginzburg-Landau (GL) equation and the time-dependent Ginzburg-Landau (TDGL) equation for the chiral order parameter in an inhomogeneous system. In our derived GL and TDGL equations, there is no other parameters except for those in the original NJL model.
|
0904.0937
|
Gautam Bhattacharyya
|
Gautam Bhattacharyya, Anindya Datta, Swarup Kumar Majee, Amitava
Raychaudhuri
|
Exploring the Universal Extra Dimension at the LHC
|
17 pages, 3 figs; v2: minor changes in text, one footnote and
reference added, to appear in Nucl. Phys. B
|
Nucl.Phys.B821:48-64,2009
|
10.1016/j.nuclphysb.2009.06.010
|
SINP/TNP/09-17, CU-Physics-05/2009, CP3-09-13, HRI-P-09-03-002,
RECAPP-HRI-2009-011
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Besides supersymmetry, the other prime candidate of physics beyond the
standard model (SM), crying out for verification at the CERN Large Hadron
Collider (LHC), is extra-dimension. To hunt for effects of Kaluza-Klein (KK)
excitations of known fermions and bosons is very much in the agenda of the LHC.
These KK states arise when the SM particles penetrate in the extra space-like
dimension(s). In this paper, we consider a 5d scenario, called `Universal Extra
Dimension', where the extra space coordinate, compactified on an orbifold
$S^1/Z_2$, is accessed by {\em all} the particles. The KK number ($n$) is
conserved at all tree level vertices. This entails the production of KK states
in pairs and renders the lightest KK particle stable, which leaves the detector
carrying away missing energy. The splitting between different KK flavors is
controlled by the zero mode masses and the bulk- and brane-induced one-loop
radiative corrections. We concentrate on the production of an $n=1$ KK
electroweak gauge boson in association with an $n=1$ KK quark. This leads to a
signal consisting of {\em only one} jet, one or more leptons and missing $p_T$.
For definiteness we usually choose the inverse radius of compactification to be
$R^{-1} = 500$ GeV, which sets the scale of the lowest lying KK states. We show
on a case-by-case basis (depending on the number of leptons in the final state)
that with 10 ${\rm fb}^{-1}$ integrated luminosity at the LHC with $\sqrt{s}$ =
14 TeV this signal can be detected over the SM background by imposing
appropriate kinematic cuts. We record some of the expectations for a possible
intermediate LHC run at $\sqrt{s}$ = 10 TeV and also exhibit the integrated
luminosity required to obtain a 5$\sigma$ signal as a function of $R^{-1}$.
|
[
{
"created": "Mon, 6 Apr 2009 14:49:36 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Jun 2009 08:31:42 GMT",
"version": "v2"
}
] |
2014-11-18
|
[
[
"Bhattacharyya",
"Gautam",
""
],
[
"Datta",
"Anindya",
""
],
[
"Majee",
"Swarup Kumar",
""
],
[
"Raychaudhuri",
"Amitava",
""
]
] |
Besides supersymmetry, the other prime candidate of physics beyond the standard model (SM), crying out for verification at the CERN Large Hadron Collider (LHC), is extra-dimension. To hunt for effects of Kaluza-Klein (KK) excitations of known fermions and bosons is very much in the agenda of the LHC. These KK states arise when the SM particles penetrate in the extra space-like dimension(s). In this paper, we consider a 5d scenario, called `Universal Extra Dimension', where the extra space coordinate, compactified on an orbifold $S^1/Z_2$, is accessed by {\em all} the particles. The KK number ($n$) is conserved at all tree level vertices. This entails the production of KK states in pairs and renders the lightest KK particle stable, which leaves the detector carrying away missing energy. The splitting between different KK flavors is controlled by the zero mode masses and the bulk- and brane-induced one-loop radiative corrections. We concentrate on the production of an $n=1$ KK electroweak gauge boson in association with an $n=1$ KK quark. This leads to a signal consisting of {\em only one} jet, one or more leptons and missing $p_T$. For definiteness we usually choose the inverse radius of compactification to be $R^{-1} = 500$ GeV, which sets the scale of the lowest lying KK states. We show on a case-by-case basis (depending on the number of leptons in the final state) that with 10 ${\rm fb}^{-1}$ integrated luminosity at the LHC with $\sqrt{s}$ = 14 TeV this signal can be detected over the SM background by imposing appropriate kinematic cuts. We record some of the expectations for a possible intermediate LHC run at $\sqrt{s}$ = 10 TeV and also exhibit the integrated luminosity required to obtain a 5$\sigma$ signal as a function of $R^{-1}$.
|
gr-qc/0306058
|
Kleihaus
|
B. Kleihaus, J. Kunz, F. Navarro-Lerida
|
Rotating Dilaton Black Holes with Hair
|
49 pages, 13 figures
|
Phys.Rev. D69 (2004) 064028
|
10.1103/PhysRevD.69.064028
| null |
gr-qc hep-th
| null |
We consider stationary rotating black holes in SU(2) Einstein-Yang-Mills
theory, coupled to a dilaton. The black holes possess non-trivial non-Abelian
electric and magnetic fields outside their regular event horizon. While generic
solutions carry no non-Abelian magnetic charge, but non-Abelian electric
charge, the presence of the dilaton field allows also for rotating solutions
with no non-Abelian charge at all. As a consequence, these special solutions do
not exhibit the generic asymptotic non-integer power fall-off of the
non-Abelian gauge field functions. The rotating black hole solutions form
sequences, characterized by the winding number $n$ and the node number $k$ of
their gauge field functions, tending to embedded Abelian black holes. The
stationary non-Abelian black hole solutions satisfy a mass formula, similar to
the Smarr formula, where the dilaton charge enters instead of the magnetic
charge. Introducing a topological charge, we conjecture, that black hole
solutions in SU(2) Einstein-Yang-Mills-dilaton theory are uniquely
characterized by their mass, their angular momentum, their dilaton charge,
their non-Abelian electric charge, and their topological charge.
|
[
{
"created": "Fri, 13 Jun 2003 15:15:16 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Kleihaus",
"B.",
""
],
[
"Kunz",
"J.",
""
],
[
"Navarro-Lerida",
"F.",
""
]
] |
We consider stationary rotating black holes in SU(2) Einstein-Yang-Mills theory, coupled to a dilaton. The black holes possess non-trivial non-Abelian electric and magnetic fields outside their regular event horizon. While generic solutions carry no non-Abelian magnetic charge, but non-Abelian electric charge, the presence of the dilaton field allows also for rotating solutions with no non-Abelian charge at all. As a consequence, these special solutions do not exhibit the generic asymptotic non-integer power fall-off of the non-Abelian gauge field functions. The rotating black hole solutions form sequences, characterized by the winding number $n$ and the node number $k$ of their gauge field functions, tending to embedded Abelian black holes. The stationary non-Abelian black hole solutions satisfy a mass formula, similar to the Smarr formula, where the dilaton charge enters instead of the magnetic charge. Introducing a topological charge, we conjecture, that black hole solutions in SU(2) Einstein-Yang-Mills-dilaton theory are uniquely characterized by their mass, their angular momentum, their dilaton charge, their non-Abelian electric charge, and their topological charge.
|
2212.13547
|
Vladimir Khatsymovsky
|
V.M. Khatsymovsky
|
On the discrete version of the Kerr-Newman solution
|
31 pages, 3 figures, typos corrected, explanations added
|
Int. J. Mod. Phys. A, Volume No. 38, Issue No. 04n05, Article No.
2350025, Year 2023
|
10.1142/S0217751X23500252
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper continues our work on black holes in the framework of the Regge
calculus, where the discrete version (with a certain edge length scale $b$
proportional to the Planck scale) of the classical solution emerges as an
optimal starting point for the perturbative expansion after functional
integration over the connection, with the singularity resolved.
An interest in the present discrete Kerr-Newman type solution (with the
parameter $a \gg b$) may be to check the classical prediction that the
electromagnetic contribution to the metric and curvature on the singularity
ring is (infinitely) greater than the contribution of the
$\delta$-function-like mass distribution, no matter how small the electric
charge is.
Here we encounter a kind of a discrete diagram technique, but with
three-dimensional (static) diagrams and with only a few diagrams, although with
modified (extended to complex coordinates) propagators.
The metric (curvature) in the vicinity of the former singularity ring is
considered. The electromagnetic contribution does indeed have a relative factor
that is infinite at $b \to 0$, but, taking into account some existing estimates
of the upper bound on the electric charge of known substances, it is not so
large for habitual bodies and can only be significant for practically
non-rotating black holes.
|
[
{
"created": "Tue, 27 Dec 2022 16:45:35 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Dec 2023 16:39:35 GMT",
"version": "v2"
}
] |
2023-12-29
|
[
[
"Khatsymovsky",
"V. M.",
""
]
] |
This paper continues our work on black holes in the framework of the Regge calculus, where the discrete version (with a certain edge length scale $b$ proportional to the Planck scale) of the classical solution emerges as an optimal starting point for the perturbative expansion after functional integration over the connection, with the singularity resolved. An interest in the present discrete Kerr-Newman type solution (with the parameter $a \gg b$) may be to check the classical prediction that the electromagnetic contribution to the metric and curvature on the singularity ring is (infinitely) greater than the contribution of the $\delta$-function-like mass distribution, no matter how small the electric charge is. Here we encounter a kind of a discrete diagram technique, but with three-dimensional (static) diagrams and with only a few diagrams, although with modified (extended to complex coordinates) propagators. The metric (curvature) in the vicinity of the former singularity ring is considered. The electromagnetic contribution does indeed have a relative factor that is infinite at $b \to 0$, but, taking into account some existing estimates of the upper bound on the electric charge of known substances, it is not so large for habitual bodies and can only be significant for practically non-rotating black holes.
|
1104.5659
|
Guillaume Faye
|
Luc Blanchet (IAP), Alessandra Buonanno, Guillaume Faye (IAP)
|
Tail-induced spin-orbit effect in the gravitational radiation of compact
binaries
|
Minor corrections. To be published in Physical Review D
| null |
10.1103/PhysRevD.84.064041
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Gravitational waves contain tail effects which are due to the back-scattering
of linear waves in the curved space-time geometry around the source. In this
paper we improve the knowledge and accuracy of the two-body inspiraling
post-Newtonian (PN) dynamics and gravitational-wave signal by computing the
spin-orbit terms induced by tail effects. Notably, we derive those terms at 3PN
order in the gravitational-wave energy flux, and 2.5PN and 3PN orders in the
wave polarizations. This is then used to derive the spin-orbit tail effects in
the phasing through 3PN order. Our results can be employed to carry out more
accurate comparisons with numerical-relativity simulations and to improve the
accuracy of analytical templates aimed at describing the whole process of
inspiral, merger and ringdown.
|
[
{
"created": "Fri, 29 Apr 2011 15:19:23 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Sep 2011 08:30:21 GMT",
"version": "v2"
}
] |
2015-05-28
|
[
[
"Blanchet",
"Luc",
"",
"IAP"
],
[
"Buonanno",
"Alessandra",
"",
"IAP"
],
[
"Faye",
"Guillaume",
"",
"IAP"
]
] |
Gravitational waves contain tail effects which are due to the back-scattering of linear waves in the curved space-time geometry around the source. In this paper we improve the knowledge and accuracy of the two-body inspiraling post-Newtonian (PN) dynamics and gravitational-wave signal by computing the spin-orbit terms induced by tail effects. Notably, we derive those terms at 3PN order in the gravitational-wave energy flux, and 2.5PN and 3PN orders in the wave polarizations. This is then used to derive the spin-orbit tail effects in the phasing through 3PN order. Our results can be employed to carry out more accurate comparisons with numerical-relativity simulations and to improve the accuracy of analytical templates aimed at describing the whole process of inspiral, merger and ringdown.
|
2306.10579
|
SanthiKumar Rajamahanthi
|
M Krishna and SobhanBabu Kappala and R Santhikumar
|
Accelerating Plane Symmetric Cosmological Model with Bulk Viscous and
Cosmic Strings in Lyra's Geometry
|
9 pages and 5 sections with references
| null | null | null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The present study deals with Lyra's geometry in plane symmetric metric
discussed in the presence of bulk viscous fluid and one dimensional strings are
assumed to be loaded with particles and the particle energy density. The
variation of Hubble's parameter gives a constant value of decelerating
parameter. The exact solution has been found for the plane symmetric model in
Lyra's geometry in the framework of bulk viscosity and string cosmology. Also,
the bulk viscous pressure is assumed to be proportional to the energy density.
The physical and geometrical properties of the model are also discussed.
|
[
{
"created": "Sun, 18 Jun 2023 14:41:23 GMT",
"version": "v1"
}
] |
2023-06-21
|
[
[
"Krishna",
"M",
""
],
[
"Kappala",
"SobhanBabu",
""
],
[
"Santhikumar",
"R",
""
]
] |
The present study deals with Lyra's geometry in plane symmetric metric discussed in the presence of bulk viscous fluid and one dimensional strings are assumed to be loaded with particles and the particle energy density. The variation of Hubble's parameter gives a constant value of decelerating parameter. The exact solution has been found for the plane symmetric model in Lyra's geometry in the framework of bulk viscosity and string cosmology. Also, the bulk viscous pressure is assumed to be proportional to the energy density. The physical and geometrical properties of the model are also discussed.
|
1710.09231
|
Christoph Gnendiger
|
C. Gnendiger, A. Signer
|
$\gamma_{5}$ in FDH
|
28 pages, 7 figures
|
Phys. Rev. D 97, 096006 (2018)
|
10.1103/PhysRevD.97.096006
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the regularization-scheme dependent treatment of $\gamma_{5}$
in the framework of dimensional regularization, mainly focusing on the
four-dimensional helicity scheme (FDH). Evaluating distinctive examples, we
find that for one-loop calculations, the recently proposed four-dimensional
formulation (FDF) of the FDH scheme constitutes a viable and efficient
alternative compared to more traditional approaches. In addition, we extend the
considerations to the two-loop level and compute the pseudo-scalar form factors
of quarks and gluons in FDH. We provide the necessary operator renormalization
and discuss at a practical level how the complexity of intermediate
calculational steps can be reduced in an efficient way.
|
[
{
"created": "Wed, 25 Oct 2017 13:43:00 GMT",
"version": "v1"
}
] |
2018-05-16
|
[
[
"Gnendiger",
"C.",
""
],
[
"Signer",
"A.",
""
]
] |
We investigate the regularization-scheme dependent treatment of $\gamma_{5}$ in the framework of dimensional regularization, mainly focusing on the four-dimensional helicity scheme (FDH). Evaluating distinctive examples, we find that for one-loop calculations, the recently proposed four-dimensional formulation (FDF) of the FDH scheme constitutes a viable and efficient alternative compared to more traditional approaches. In addition, we extend the considerations to the two-loop level and compute the pseudo-scalar form factors of quarks and gluons in FDH. We provide the necessary operator renormalization and discuss at a practical level how the complexity of intermediate calculational steps can be reduced in an efficient way.
|
hep-ph/9411346
|
Anna Jadczyk
|
Ludwik Turko
|
Hadronic Matter with Internal Symmetries and its Consequences: An
Expanding Hadronic Gas
|
7 pages, 2 figures - uucoded file of figures appended at the end,
separated from the paper by lines with many dashes
| null | null | null |
hep-ph
| null |
We consider an ideal gas of massive hadrons in thermal and chemical
equilibrium. The gas expands longitudinally in accordance with Bjorken law.
Strangeness and baryon number conservation is taken into account. This gas has
different features as compared to the pion gas.
|
[
{
"created": "Mon, 21 Nov 1994 10:44:56 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Turko",
"Ludwik",
""
]
] |
We consider an ideal gas of massive hadrons in thermal and chemical equilibrium. The gas expands longitudinally in accordance with Bjorken law. Strangeness and baryon number conservation is taken into account. This gas has different features as compared to the pion gas.
|
0901.4749
|
Rong Li
|
Chao-Hsi Chang, Rong Li and Jian-Xiong Wang
|
J/\psi polarization in photo-production up-to the next-to-leading order
of QCD
|
5 pages, 3 figures. Discussion on the theoretical uncertainties from
the choice of renormalization scale was added
|
Phys.Rev.D80:034020,2009
|
10.1103/PhysRevD.80.034020
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the J/psi polarization in photoproduction at the Hadron
Electron Ring Accelerator(HERA) up to the next-to-leading order of QCD. The
results show that the transverse momentum p_t and energy fraction z
distributions of J/psi production do not agree with the observed ones very
well. The theoretical uncertainties for the z distributions of the J/psi
polarization parameters with respect to various choices of the renormalization
and factorization scales are too large to give an accurate prediction. The
uncertainties for the p_t distributions of these parameters are small when
p_t>3GeV and the obtained p_t distributions can not describe the experimental
data even in this region.
|
[
{
"created": "Thu, 29 Jan 2009 19:10:59 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Feb 2009 17:18:09 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Oct 2009 15:34:33 GMT",
"version": "v3"
}
] |
2009-10-13
|
[
[
"Chang",
"Chao-Hsi",
""
],
[
"Li",
"Rong",
""
],
[
"Wang",
"Jian-Xiong",
""
]
] |
We investigate the J/psi polarization in photoproduction at the Hadron Electron Ring Accelerator(HERA) up to the next-to-leading order of QCD. The results show that the transverse momentum p_t and energy fraction z distributions of J/psi production do not agree with the observed ones very well. The theoretical uncertainties for the z distributions of the J/psi polarization parameters with respect to various choices of the renormalization and factorization scales are too large to give an accurate prediction. The uncertainties for the p_t distributions of these parameters are small when p_t>3GeV and the obtained p_t distributions can not describe the experimental data even in this region.
|
hep-ph/0609267
|
Seung-Il Nam
|
Seung-il Nam and Hyun-Chul Kim
|
Leading-twist pion and kaon distribution amplitudes in the
gauge-invariant nonlocal chiral quark model from the instanton vacuum
|
14 pages, 10 figures
|
Phys.Rev.D74:076005,2006
|
10.1103/PhysRevD.74.076005
|
PNU-NTG-05/2006 and PNU-NURI-06/2006
|
hep-ph
| null |
We investigate the leading-twist light-cone distribution amplitudes for the
pion and kaon based on the gauge-invariant nonlocal chiral quark model from the
instanton vacuum in the presence of external axial-vector currents. We find
that the nonlocal contribution from the gauge invariance has much effects on
the pion distribution amplitudes, while it changes mildly the kaon ones. We
also study the Gegenbauer moments of the distribution amplitudes and compare
them with the empirical analysis of the CLEO data.
|
[
{
"created": "Tue, 26 Sep 2006 11:34:09 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Nam",
"Seung-il",
""
],
[
"Kim",
"Hyun-Chul",
""
]
] |
We investigate the leading-twist light-cone distribution amplitudes for the pion and kaon based on the gauge-invariant nonlocal chiral quark model from the instanton vacuum in the presence of external axial-vector currents. We find that the nonlocal contribution from the gauge invariance has much effects on the pion distribution amplitudes, while it changes mildly the kaon ones. We also study the Gegenbauer moments of the distribution amplitudes and compare them with the empirical analysis of the CLEO data.
|
1702.07702
|
Sofia Leit\~ao
|
Sofia Leit\~ao, Alfred Stadler, M. T. Pe\~na and E. P. Biernat
|
Application of the Covariant Spectator Theory to the study of heavy and
heavy-light mesons
| null | null |
10.1007/s00601-017-1251-0
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
As an application of the Covariant Spectator Theory (CST) we calculate the
spectrum of heavy-light and heavy-heavy mesons using covariant versions of a
linear confining potential, a one- gluon exchange, and a constant interaction.
The CST equations possess the correct one-body limit and are therefore
well-suited to describe mesons in which one quark is much heavier than the
other. We find a good fit to the mass spectrum of heavy-light and heavy-heavy
mesons with just three parameters (apart from the quark masses). Remarkably,
the fit parameters are nearly unchanged when we fit to experimental
pseudoscalar states only or to the whole spectrum. Because pseudoscalar states
are insensitive to spin-orbit interactions and do not determine spin-spin
interactions separately from central interactions, this result suggests that it
is the covariance of the kernel that correctly predicts the spin-dependent
quark-antiquark interactions
|
[
{
"created": "Fri, 24 Feb 2017 18:46:27 GMT",
"version": "v1"
}
] |
2017-03-01
|
[
[
"Leitão",
"Sofia",
""
],
[
"Stadler",
"Alfred",
""
],
[
"Peña",
"M. T.",
""
],
[
"Biernat",
"E. P.",
""
]
] |
As an application of the Covariant Spectator Theory (CST) we calculate the spectrum of heavy-light and heavy-heavy mesons using covariant versions of a linear confining potential, a one- gluon exchange, and a constant interaction. The CST equations possess the correct one-body limit and are therefore well-suited to describe mesons in which one quark is much heavier than the other. We find a good fit to the mass spectrum of heavy-light and heavy-heavy mesons with just three parameters (apart from the quark masses). Remarkably, the fit parameters are nearly unchanged when we fit to experimental pseudoscalar states only or to the whole spectrum. Because pseudoscalar states are insensitive to spin-orbit interactions and do not determine spin-spin interactions separately from central interactions, this result suggests that it is the covariance of the kernel that correctly predicts the spin-dependent quark-antiquark interactions
|
hep-ph/9801417
|
J. Gunion
|
John F. Gunion (U.C. Davis)
|
Searching for Low-Energy Supersymmetry
|
60 pages, to appear in Quantum Effects in the MSSM, the Proceedings
of the ``International Workshop on Quantum Effects in the MSSM'', UAB,
Barcelona, September 9--13, 1997; full postscript file, including embedded
figures, is available via anonymous ftp at
ftp://ucdhep.ucdavis.edu/gunion/barcelona_hepph.ps
| null | null |
UCD-98-2
|
hep-ph hep-ex
| null |
A review of supersymmetry theory and phenomenology is presented. Topics
discussed include: gravity-mediated (SUGRA) and gauge-mediated (GMSB)
supersymmetry breaking models; an overview of non-universal
soft-supersymmetry-breaking masses and the resulting experimental implications;
the phenomenology of and constraints on the possibility that a massive gluino
is the lightest supersymmetric particle; current status of the phenomenology of
the Higgs bosons of the minimal and next-to-minimal supersymmetric models; and,
the signals for GMSB and/or R-parity-violating models coming from delayed
decays of the lightest supersymmetric partner of the Standard Model particles.
|
[
{
"created": "Tue, 27 Jan 1998 17:29:06 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Gunion",
"John F.",
"",
"U.C. Davis"
]
] |
A review of supersymmetry theory and phenomenology is presented. Topics discussed include: gravity-mediated (SUGRA) and gauge-mediated (GMSB) supersymmetry breaking models; an overview of non-universal soft-supersymmetry-breaking masses and the resulting experimental implications; the phenomenology of and constraints on the possibility that a massive gluino is the lightest supersymmetric particle; current status of the phenomenology of the Higgs bosons of the minimal and next-to-minimal supersymmetric models; and, the signals for GMSB and/or R-parity-violating models coming from delayed decays of the lightest supersymmetric partner of the Standard Model particles.
|
2211.10481
|
Michael Grayson
|
Michael Grayson, Charlie Rackson
|
Maximal energy extraction through information gathering
|
6 pages, 1 figure
| null | null | null |
gr-qc quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the maximal non-equilibrium work that can be extracted from any
mass using information about its micro-state. This is done through the use of
black hole thermodynamics in the context of the thermodynamics of information.
The non-equilibrium work that can be obtained by knowing the exact micro-state
is found to be $\frac{1}{2} Mc^{2}$. This is calculated using the entropy of an
eternal, uncharged, non rotating black hole. This is derivation helps elucidate
the relativity of entropy and its relationship to general relativity and time.
|
[
{
"created": "Fri, 18 Nov 2022 19:31:48 GMT",
"version": "v1"
}
] |
2022-11-22
|
[
[
"Grayson",
"Michael",
""
],
[
"Rackson",
"Charlie",
""
]
] |
We calculate the maximal non-equilibrium work that can be extracted from any mass using information about its micro-state. This is done through the use of black hole thermodynamics in the context of the thermodynamics of information. The non-equilibrium work that can be obtained by knowing the exact micro-state is found to be $\frac{1}{2} Mc^{2}$. This is calculated using the entropy of an eternal, uncharged, non rotating black hole. This is derivation helps elucidate the relativity of entropy and its relationship to general relativity and time.
|
2005.01515
|
Emidio Gabrielli
|
Marco Fabbrichesi, Emidio Gabrielli, Gaia Lanfranchi
|
The Dark Photon
|
70 pages, 18 figures. Final version. The Physics of the Dark Photon
(SpringerBriefs in Physics)
|
SpringerBriefs in Physics 2020
|
10.1007/978-3-030-62519-1
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The dark photon is a new gauge boson whose existence has been conjectured. It
is dark because it arises from a symmetry of a hypothetical dark sector
comprising particles completely neutral under the Standard Model interactions.
Dark though it is, this new gauge boson can be detected because of its kinetic
mixing with the ordinary, visible photon. We review its physics from the
theoretical and the experimental point of view. We discuss the difference
between the massive and the massless case. We explain how the dark photon
enters laboratory, astrophysical and cosmological observations as well as dark
matter physics. We survey the current and future experimental limits on the
parameters of the massless and massive dark photons together with the related
bounds on milli-charged fermions.
|
[
{
"created": "Mon, 4 May 2020 14:31:03 GMT",
"version": "v1"
},
{
"created": "Mon, 25 May 2020 20:49:22 GMT",
"version": "v2"
},
{
"created": "Fri, 16 Oct 2020 18:38:00 GMT",
"version": "v3"
}
] |
2021-03-02
|
[
[
"Fabbrichesi",
"Marco",
""
],
[
"Gabrielli",
"Emidio",
""
],
[
"Lanfranchi",
"Gaia",
""
]
] |
The dark photon is a new gauge boson whose existence has been conjectured. It is dark because it arises from a symmetry of a hypothetical dark sector comprising particles completely neutral under the Standard Model interactions. Dark though it is, this new gauge boson can be detected because of its kinetic mixing with the ordinary, visible photon. We review its physics from the theoretical and the experimental point of view. We discuss the difference between the massive and the massless case. We explain how the dark photon enters laboratory, astrophysical and cosmological observations as well as dark matter physics. We survey the current and future experimental limits on the parameters of the massless and massive dark photons together with the related bounds on milli-charged fermions.
|
hep-ph/0303254
|
Georg Kreyerhoff
|
Saul Barshay and Georg Kreyerhoff
|
A new implication for strong interactions if large, direct CP violation
in Bbar^0(B^0) -> pi^+pi^- is confirmed
|
6 pages, no figures
|
JHEP 0309:004,2003
|
10.1088/1126-6708/2003/09/004
| null |
hep-ph
| null |
We show that the large, direct CP-violation parameter
$A_{\pi\pi}=-C_{\pi\pi}$, reported by the BELLE collaboration in the decays
Bbar^0(B^0) -> \pi^+\pi^-, implies an unusual situation in which the presence
of a very large difference between two strong-interaction phases ~ -110 deg.
plays an essential role. We make the demonstration within a model of strong,
two-body quasi-elastic interactions between physical hadrons. The model can
accommodate a large difference between two strong-interaction phases, for which
it provides a natural enhancement.
|
[
{
"created": "Sun, 30 Mar 2003 17:23:17 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Apr 2003 06:08:28 GMT",
"version": "v2"
},
{
"created": "Tue, 13 May 2003 16:59:54 GMT",
"version": "v3"
}
] |
2011-01-05
|
[
[
"Barshay",
"Saul",
""
],
[
"Kreyerhoff",
"Georg",
""
]
] |
We show that the large, direct CP-violation parameter $A_{\pi\pi}=-C_{\pi\pi}$, reported by the BELLE collaboration in the decays Bbar^0(B^0) -> \pi^+\pi^-, implies an unusual situation in which the presence of a very large difference between two strong-interaction phases ~ -110 deg. plays an essential role. We make the demonstration within a model of strong, two-body quasi-elastic interactions between physical hadrons. The model can accommodate a large difference between two strong-interaction phases, for which it provides a natural enhancement.
|
gr-qc/9703075
|
Sai Iyer
|
A. Gopakumar, Bala R. Iyer and Sai Iyer
|
Second post-Newtonian gravitational radiation reaction for two-body
systems: Nonspinning bodies
|
38 pages, REVTeX, no figures, to appear in Phys. Rev. D
|
Phys.Rev.D55:6030-6053,1997; Erratum-ibid.D57:6562,1998
|
10.1103/PhysRevD.55.6030 10.1103/PhysRevD.57.6562
| null |
gr-qc
| null |
Starting from the recently obtained 2PN accurate forms of the energy and
angular momentum fluxes from inspiralling compact binaries, we deduce the
gravitational radiation reaction to 2PN order beyond the quadrupole
approximation - 4.5PN terms in the equation of motion - using the refined
balance method proposed by Iyer and Will. We explore critically the features of
their construction and illustrate them by contrast to other possible variants.
The equations of motion are valid for general binary orbits and for a class of
coordinate gauges. The limiting cases of circular orbits and radial infall are
also discussed.
|
[
{
"created": "Wed, 26 Mar 1997 04:47:03 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Gopakumar",
"A.",
""
],
[
"Iyer",
"Bala R.",
""
],
[
"Iyer",
"Sai",
""
]
] |
Starting from the recently obtained 2PN accurate forms of the energy and angular momentum fluxes from inspiralling compact binaries, we deduce the gravitational radiation reaction to 2PN order beyond the quadrupole approximation - 4.5PN terms in the equation of motion - using the refined balance method proposed by Iyer and Will. We explore critically the features of their construction and illustrate them by contrast to other possible variants. The equations of motion are valid for general binary orbits and for a class of coordinate gauges. The limiting cases of circular orbits and radial infall are also discussed.
|
2210.02164
|
Kenta Hioki
|
Kenta Hioki and Umpei Miyamoto
|
Determining parameters of a spherical black hole with a thin accretion
disk by observing its shadow
|
28 pages, 11 figures, title modified, sec 6 added, accepted for
publication in Physical Review D
| null |
10.1103/PhysRevD.107.044042
| null |
gr-qc astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisit the classic system of a spherically symmetric black hole in
general relativity (i.e., a Schwarzschild black hole) surrounded by a
geometrically thin accretion disk. Our purpose is to examine whether one can
determine three parameters of this system (i.e., black hole mass $M$, distance
between the black hole and an observer $r_o$, inclination angle $i$) solely by
observing the accretion disk and the black hole shadow. A point in our analysis
is to allow $r_o$ to be finite, which is set to be infinite in most relevant
studies. First, it is shown that one can determine the values of $(r_o/M, i)$,
where $M/r_o$ is the so-called angular gravitational radius, from the size and
shape of shadow. Then, it is shown that if one additionally knows the accretion
rate $\dot{M}$ (respectively, mass $M$) by any independent theoretical or
observational approach, one can determine the values of $(M, r_o, i)$
[respectively, $(\dot{M}, r_o, i)$] without degeneracy, in principle, from the
value of flux at any point on the accretion disk.
|
[
{
"created": "Wed, 5 Oct 2022 11:47:14 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Feb 2023 11:58:42 GMT",
"version": "v2"
}
] |
2023-03-08
|
[
[
"Hioki",
"Kenta",
""
],
[
"Miyamoto",
"Umpei",
""
]
] |
We revisit the classic system of a spherically symmetric black hole in general relativity (i.e., a Schwarzschild black hole) surrounded by a geometrically thin accretion disk. Our purpose is to examine whether one can determine three parameters of this system (i.e., black hole mass $M$, distance between the black hole and an observer $r_o$, inclination angle $i$) solely by observing the accretion disk and the black hole shadow. A point in our analysis is to allow $r_o$ to be finite, which is set to be infinite in most relevant studies. First, it is shown that one can determine the values of $(r_o/M, i)$, where $M/r_o$ is the so-called angular gravitational radius, from the size and shape of shadow. Then, it is shown that if one additionally knows the accretion rate $\dot{M}$ (respectively, mass $M$) by any independent theoretical or observational approach, one can determine the values of $(M, r_o, i)$ [respectively, $(\dot{M}, r_o, i)$] without degeneracy, in principle, from the value of flux at any point on the accretion disk.
|
1603.03660
|
Raquel Gomez-Ambrosio
|
Michele Boggia (Albert-Ludwigs-Universitaet, Freiburg), Raquel
Gomez-Ambrosio (INFN, Turin and Turin U.), Giampiero Passarino (INFN, Turin
and Turin U.)
|
Low energy behaviour of standard model extensions
|
32 pages, 8 figures
| null | null |
FR-PHENO-2016-004
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The integration of heavy scalar fields is discussed in a class of BSM models,
containing more that one representation for scalars and with mixing. The
interplay between integrating out heavy scalars and the Standard Model
decoupling limit is examined. In general, the latter cannot be obtained in
terms of only one large scale and can only be achieved by imposing further
assumptions on the couplings. Systematic low-energy expansions are derived in
the more general, non-decoupling scenario, including mixed tree-loop and mixed
heavy-light generated operators. The number of local operators is larger than
the one usually reported in the literature.
|
[
{
"created": "Fri, 11 Mar 2016 15:23:52 GMT",
"version": "v1"
}
] |
2016-03-14
|
[
[
"Boggia",
"Michele",
"",
"Albert-Ludwigs-Universitaet, Freiburg"
],
[
"Gomez-Ambrosio",
"Raquel",
"",
"INFN, Turin and Turin U."
],
[
"Passarino",
"Giampiero",
"",
"INFN, Turin\n and Turin U."
]
] |
The integration of heavy scalar fields is discussed in a class of BSM models, containing more that one representation for scalars and with mixing. The interplay between integrating out heavy scalars and the Standard Model decoupling limit is examined. In general, the latter cannot be obtained in terms of only one large scale and can only be achieved by imposing further assumptions on the couplings. Systematic low-energy expansions are derived in the more general, non-decoupling scenario, including mixed tree-loop and mixed heavy-light generated operators. The number of local operators is larger than the one usually reported in the literature.
|
hep-ph/0002300
|
Elena Gonzalez Ferreiro
|
A. Capella, E. G. Ferreiro and A. B. Kaidalov
|
Non-saturation of the J/psi suppression at large transverse energy in
the comovers approach
|
12 pages, latex, 2 postscript figures
|
Phys.Rev.Lett. 85 (2000) 2080-2083
|
10.1103/PhysRevLett.85.2080
|
LPTHE Orsay 00-21
|
hep-ph
| null |
We show that, contrary to recent claims, the $J/\psi$ suppression resulting
from its interaction with comovers does not saturate at large transverse energy
$E_T$. On the contrary, it shows a characteristic structure - change of
curvature near the knee of the $E_T$ distribution - which is due to the $E_T$
(or multiplicity) fluctuation, and agrees with recent experimental results.
|
[
{
"created": "Tue, 29 Feb 2000 15:02:48 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Capella",
"A.",
""
],
[
"Ferreiro",
"E. G.",
""
],
[
"Kaidalov",
"A. B.",
""
]
] |
We show that, contrary to recent claims, the $J/\psi$ suppression resulting from its interaction with comovers does not saturate at large transverse energy $E_T$. On the contrary, it shows a characteristic structure - change of curvature near the knee of the $E_T$ distribution - which is due to the $E_T$ (or multiplicity) fluctuation, and agrees with recent experimental results.
|
0710.3585
|
David Shih
|
Clifford Cheung, A. Liam Fitzpatrick, David Shih
|
(Extra)Ordinary Gauge Mediation
|
50 pages, 11 figures
|
JHEP 0807:054,2008
|
10.1088/1126-6708/2008/07/054
| null |
hep-ph hep-th
| null |
We study models of "(extra)ordinary gauge mediation," which consist of taking
ordinary gauge mediation and extending the messenger superpotential to include
all renormalizable couplings consistent with SM gauge invariance and an
R-symmetry. We classify all such models and find that their phenomenology can
differ significantly from that of ordinary gauge mediation. Some highlights
include: arbitrary modifications of the squark/slepton mass relations, small mu
and Higgsino NLSP's, and the possibility of having fewer than one effective
messenger. We also show how these models lead naturally to extremely simple
examples of direct gauge mediation, where SUSY and R-symmetry breaking occur
not in a hidden sector, but due to the dynamics of the messenger sector itself.
|
[
{
"created": "Thu, 18 Oct 2007 19:54:09 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Nov 2007 19:56:23 GMT",
"version": "v2"
},
{
"created": "Thu, 29 Nov 2007 06:15:55 GMT",
"version": "v3"
}
] |
2009-01-06
|
[
[
"Cheung",
"Clifford",
""
],
[
"Fitzpatrick",
"A. Liam",
""
],
[
"Shih",
"David",
""
]
] |
We study models of "(extra)ordinary gauge mediation," which consist of taking ordinary gauge mediation and extending the messenger superpotential to include all renormalizable couplings consistent with SM gauge invariance and an R-symmetry. We classify all such models and find that their phenomenology can differ significantly from that of ordinary gauge mediation. Some highlights include: arbitrary modifications of the squark/slepton mass relations, small mu and Higgsino NLSP's, and the possibility of having fewer than one effective messenger. We also show how these models lead naturally to extremely simple examples of direct gauge mediation, where SUSY and R-symmetry breaking occur not in a hidden sector, but due to the dynamics of the messenger sector itself.
|
gr-qc/0510029
|
Peter D'Eath
|
A.N.St.J.Farley and P.D.D'Eath
|
Quantum Amplitudes in Black-Hole Evaporation II. Spin-0 Amplitude
| null | null | null | null |
gr-qc
| null |
This work on spin-0 amplitudes in black-hole evaporation is based on the
underlying results and methods outlined in our first paper, "I. Complex
Approach". The main result here, and the model calculation for work on all
higher spins, as described in several further papers, is the computation of the
quantum amplitude (rather than merely the probability) for a given slightly
anisotropic configuration of a scalar field $\phi$ on a space-like hypersurface
$\Sigma_F$ at a very late time $T$. For simplicity, one may take the initial
data for gravity and the massless scalar field at an initial surface $\Sigma_I$
to be spherically symmetric. This applies to perturbations of
spherically-symmetric collapse to a black hole, starting from a diffuse,
nearly-stationary configuration, where the bosonic part of the Lagrangian
consists of Einstein gravity and the massless scalar field. As in Paper I,
Feynman's $+i\epsilon$ approach is taken; this involves a rotation into the
complex: $T\to {\mid}T{\mid} \exp (-i\theta)$, with $0<\theta\leq\pi/2$. A
complex solution of the classical boundary-value problem is expected to exist,
provided $\theta>0$; although for $\theta =0$ (Lorentzian time-separation), the
classical boundary-value problem is badly posed. Once the amplitude is found
for $\theta>0$, one can take the limit $\theta\to 0_+$ to find the Lorentzian
amplitude. The paper also includes a discussion of adiabatic solutions of the
scalar wave equation, needed for the spin-0 calculation.
|
[
{
"created": "Fri, 7 Oct 2005 16:29:53 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Farley",
"A. N. St. J.",
""
],
[
"D'Eath",
"P. D.",
""
]
] |
This work on spin-0 amplitudes in black-hole evaporation is based on the underlying results and methods outlined in our first paper, "I. Complex Approach". The main result here, and the model calculation for work on all higher spins, as described in several further papers, is the computation of the quantum amplitude (rather than merely the probability) for a given slightly anisotropic configuration of a scalar field $\phi$ on a space-like hypersurface $\Sigma_F$ at a very late time $T$. For simplicity, one may take the initial data for gravity and the massless scalar field at an initial surface $\Sigma_I$ to be spherically symmetric. This applies to perturbations of spherically-symmetric collapse to a black hole, starting from a diffuse, nearly-stationary configuration, where the bosonic part of the Lagrangian consists of Einstein gravity and the massless scalar field. As in Paper I, Feynman's $+i\epsilon$ approach is taken; this involves a rotation into the complex: $T\to {\mid}T{\mid} \exp (-i\theta)$, with $0<\theta\leq\pi/2$. A complex solution of the classical boundary-value problem is expected to exist, provided $\theta>0$; although for $\theta =0$ (Lorentzian time-separation), the classical boundary-value problem is badly posed. Once the amplitude is found for $\theta>0$, one can take the limit $\theta\to 0_+$ to find the Lorentzian amplitude. The paper also includes a discussion of adiabatic solutions of the scalar wave equation, needed for the spin-0 calculation.
|
1704.06883
|
Anton Sheykin
|
A. A. Sheykin, S. A. Paston
|
Field-Theoretical Formulation of Regge-Teitelboim Gravity
|
This version contains some additions in comparison with the journal
version: the derivation of the Jacobian was added
|
Physics of Atomic Nuclei, 2016, Vol. 79, No. 11-12, pp. 1494-1496
|
10.1134/S1063778816100124
| null |
gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Theory of gravity is considered in the Regge-Teitelboim approach in which the
pseudo-Riemannian space is treated as a surface isometrically embedded in an
ambient Minkowski space of higher dimension. This approach is formulated in
terms of a field theory in which the original pseudo-Rimannian space is defined
by the field constant-value surfaces. The symmetry properties of the proposed
theory are investigated, and possible structure of the field-theoretical
Lagrangian is discussed.
|
[
{
"created": "Sun, 23 Apr 2017 05:26:02 GMT",
"version": "v1"
}
] |
2017-04-25
|
[
[
"Sheykin",
"A. A.",
""
],
[
"Paston",
"S. A.",
""
]
] |
Theory of gravity is considered in the Regge-Teitelboim approach in which the pseudo-Riemannian space is treated as a surface isometrically embedded in an ambient Minkowski space of higher dimension. This approach is formulated in terms of a field theory in which the original pseudo-Rimannian space is defined by the field constant-value surfaces. The symmetry properties of the proposed theory are investigated, and possible structure of the field-theoretical Lagrangian is discussed.
|
hep-ph/0307279
|
Veniamin Berezinsky
|
R. Aloisio, V. Berezinsky and M. Kachelriess
|
Fragmentation functions in SUSY QCD and UHECR spectra produced in
top-down models
|
LATEX, 20 pages, 21 figures, revised version, accepted for
publication in Physical Review D
|
Phys.Rev.D69:094023,2004
|
10.1103/PhysRevD.69.094023
| null |
hep-ph astro-ph
| null |
We present results from two different methods for the calculation of hadron
spectra in QCD and SUSY QCD with large primary energies $\sqrt{s}$ up to
$10^{16}$ GeV. The two methods considered are a Monte Carlo (MC) simulation and
the evolution of fragmentation functions described by the
Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) equations. We find that the
pion, nucleon and all-hadron spectra calculated with the two methods agree
well. The MC simulation is performed with new hadronization functions (in
comparison with our previous work), motivated by low-energy ($\sqrt s < M_Z$)
data and DGLAP. The hadron spectra calculated with both sets of hadronization
functions agree well, which indicates that our method for calculating the
hadronization function works successfully. The small difference in the
calculated hadron spectra characterizes the uncertainties of this method. We
calculate also the spectra of photons, neutrinos and nucleons and compare them
with other published results. The agreement is good for all $x$ from $\sim
10^{-5}$ up to $x\leq 0.3$. The consistency of the spectra calculated by
different methods allows to consider the spectral shape as a signature of
models with decays or annihilations of superheavy particles, such as
topological defects or superheavy DM. The UHECR spectra from these sources are
calculated.
|
[
{
"created": "Tue, 22 Jul 2003 14:16:48 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Feb 2004 13:01:24 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Aloisio",
"R.",
""
],
[
"Berezinsky",
"V.",
""
],
[
"Kachelriess",
"M.",
""
]
] |
We present results from two different methods for the calculation of hadron spectra in QCD and SUSY QCD with large primary energies $\sqrt{s}$ up to $10^{16}$ GeV. The two methods considered are a Monte Carlo (MC) simulation and the evolution of fragmentation functions described by the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) equations. We find that the pion, nucleon and all-hadron spectra calculated with the two methods agree well. The MC simulation is performed with new hadronization functions (in comparison with our previous work), motivated by low-energy ($\sqrt s < M_Z$) data and DGLAP. The hadron spectra calculated with both sets of hadronization functions agree well, which indicates that our method for calculating the hadronization function works successfully. The small difference in the calculated hadron spectra characterizes the uncertainties of this method. We calculate also the spectra of photons, neutrinos and nucleons and compare them with other published results. The agreement is good for all $x$ from $\sim 10^{-5}$ up to $x\leq 0.3$. The consistency of the spectra calculated by different methods allows to consider the spectral shape as a signature of models with decays or annihilations of superheavy particles, such as topological defects or superheavy DM. The UHECR spectra from these sources are calculated.
|
1303.0653
|
Vladimir Dmitriev
|
V.F. Dmitriev and A.I. Milstein
|
Final state Coulomb interaction and asymmetry of pair production close
to threshold in $e^+e^-$ annihilation
|
7 pages, no figures
|
Physics Letters B 722 (2013) 83-85
|
10.1016/j.physletb.2013.03.036
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate a contribution of the $d$ wave to the cross section of
$e^+e^-$ annihilation to the pair of charged leptons or nucleons close to
threshold of the process. In contrast to the point of view accepted in
literature, due to the Coulomb final state interaction this contribution does
not vanish even at zero relative velocity of produced particles. This results
in the nonzero asymmetry in angular distribution at threshold. Though value of
the asymmetry is small, observation of this effect is not hopeless.
|
[
{
"created": "Mon, 4 Mar 2013 09:38:27 GMT",
"version": "v1"
}
] |
2013-07-11
|
[
[
"Dmitriev",
"V. F.",
""
],
[
"Milstein",
"A. I.",
""
]
] |
We investigate a contribution of the $d$ wave to the cross section of $e^+e^-$ annihilation to the pair of charged leptons or nucleons close to threshold of the process. In contrast to the point of view accepted in literature, due to the Coulomb final state interaction this contribution does not vanish even at zero relative velocity of produced particles. This results in the nonzero asymmetry in angular distribution at threshold. Though value of the asymmetry is small, observation of this effect is not hopeless.
|
gr-qc/0310010
|
Xin-Zhou Li
|
Xiang-hua Zhai, Li-ping Fu
|
Features of Motion Around Charged D-Stars
|
9 pages, 2 figures
|
Nuovo Cim.B119:157-166,2004
|
10.1393/ncb/i2003-10091-6
| null |
gr-qc
| null |
The motion of light and a neutral test particle around the charged D-star has
been studied. The difference of the deficit angle of light from the case in
asymptotically flat spacetime is in a factor $(1-\epsilon^2)$. The motion of a
test particle is affected by the deficit angle and the charge. Through the
phase analysis, we prove the existence of the periodic solution to the equation
of motion and the effect of the deficit angle and the charge to the critical
point and its type. We also give the conditions under which the critical point
is a stable center and an unstable saddle point.
|
[
{
"created": "Thu, 2 Oct 2003 07:23:04 GMT",
"version": "v1"
}
] |
2011-08-24
|
[
[
"Zhai",
"Xiang-hua",
""
],
[
"Fu",
"Li-ping",
""
]
] |
The motion of light and a neutral test particle around the charged D-star has been studied. The difference of the deficit angle of light from the case in asymptotically flat spacetime is in a factor $(1-\epsilon^2)$. The motion of a test particle is affected by the deficit angle and the charge. Through the phase analysis, we prove the existence of the periodic solution to the equation of motion and the effect of the deficit angle and the charge to the critical point and its type. We also give the conditions under which the critical point is a stable center and an unstable saddle point.
|
2301.00827
|
Zhengkang Zhang
|
Timothy Cohen, Xiaochuan Lu, Zhengkang Zhang
|
Anomaly Cancellation in Effective Field Theories From the Covariant
Derivative Expansion
|
21 pages
| null | null |
CERN-TH-2023-002
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We extend our recently-proposed formalism for calculating anomalies of global
and gauge symmetries using the Covariant Derivative Expansion to include a
general class of operators that can appear in relativistic Effective Field
Theories (EFTs). This allows us to prove that EFT operators involving general
scalar, vector, and tensor couplings to fermion bilinears only give rise to
irrelevant anomalies, which can be removed by an appropriate choice of
counterterms, thereby confirming the absence of new constraints from anomaly
cancellation on the Standard Model EFT.
|
[
{
"created": "Mon, 2 Jan 2023 19:00:03 GMT",
"version": "v1"
}
] |
2023-01-04
|
[
[
"Cohen",
"Timothy",
""
],
[
"Lu",
"Xiaochuan",
""
],
[
"Zhang",
"Zhengkang",
""
]
] |
We extend our recently-proposed formalism for calculating anomalies of global and gauge symmetries using the Covariant Derivative Expansion to include a general class of operators that can appear in relativistic Effective Field Theories (EFTs). This allows us to prove that EFT operators involving general scalar, vector, and tensor couplings to fermion bilinears only give rise to irrelevant anomalies, which can be removed by an appropriate choice of counterterms, thereby confirming the absence of new constraints from anomaly cancellation on the Standard Model EFT.
|
1312.3969
|
Brian C. Tiburzi
|
Jong-Wan Lee, Brian C. Tiburzi
|
Background Electromagnetic Fields and NRQED Matching: Scalar Case
|
15 pages
|
Phys. Rev. D 89, 054017 (2014)
|
10.1103/PhysRevD.89.054017
|
RBRC-1054
|
hep-ph hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The low-energy structure of hadrons can be described systematically using
effective field theory, and the parameters of the effective theory can be
determined from lattice QCD computations. Recent work, however, points to
inconsistencies between the background field method in lattice QCD and
effective field theory matching conditions. We show that the background field
problem necessitates inclusion of operators related by equations of motion. In
the presence of time-dependent electromagnetic fields, for example, such
operators modify Green's functions, thereby complicating the isolation of
hadronic parameters which enter on-shell scattering amplitudes. The
particularly simple case of a scalar hadron coupled to uniform electromagnetic
fields is investigated in detail. At the level of the relativistic effective
theory, operators related by equations of motion are demonstrated to be
innocuous. The same result does not hold in the non-relativistic effective
theory, and inconsistencies in matching are resolved by carefully treating
operators related by equations of motion. As uniform external fields
potentially allow for surface terms, the problem is additionally analyzed on a
torus where such terms are absent. Finite-size corrections are derived for
charged scalar correlation functions in uniform electric fields as a useful
byproduct.
|
[
{
"created": "Fri, 13 Dec 2013 21:58:58 GMT",
"version": "v1"
}
] |
2014-03-26
|
[
[
"Lee",
"Jong-Wan",
""
],
[
"Tiburzi",
"Brian C.",
""
]
] |
The low-energy structure of hadrons can be described systematically using effective field theory, and the parameters of the effective theory can be determined from lattice QCD computations. Recent work, however, points to inconsistencies between the background field method in lattice QCD and effective field theory matching conditions. We show that the background field problem necessitates inclusion of operators related by equations of motion. In the presence of time-dependent electromagnetic fields, for example, such operators modify Green's functions, thereby complicating the isolation of hadronic parameters which enter on-shell scattering amplitudes. The particularly simple case of a scalar hadron coupled to uniform electromagnetic fields is investigated in detail. At the level of the relativistic effective theory, operators related by equations of motion are demonstrated to be innocuous. The same result does not hold in the non-relativistic effective theory, and inconsistencies in matching are resolved by carefully treating operators related by equations of motion. As uniform external fields potentially allow for surface terms, the problem is additionally analyzed on a torus where such terms are absent. Finite-size corrections are derived for charged scalar correlation functions in uniform electric fields as a useful byproduct.
|
hep-ph/0301224
|
Yakov Azimov
|
Ya. I. Azimov
|
Isospin violation in mixing and decays of rho- and omega-mesons
|
Talk presented at KTM-80, dedicated to 80th anniversary of
K.A.Ter-Martirosyan, Moscow, ITEP, 30 Sep.--1 Oct. 2002; to be published in
Proceedings (a special issue of Phys.Atom.Nucl.). LATEX, 9 pages, 1 eps fig
|
Phys.Atom.Nucl.66:1989-1993,2003; Yad.Fiz.66:2039-2043,2003
|
10.1134/1.1625742
| null |
hep-ph hep-ex nucl-th
| null |
Influence of the isospin-violating (\rho^0, \omega)-mixing is discussed for
any pair of decays of \rho^0, \omega into the same final state. It is
demonstrated, in analogy to the CP-violation in neutral kaon decays, that
isospin violation can manifest itself in various forms: direct violation in
amplitudes and/or violation due to mixing. In addition to the known decays
(\rho^0, \omega)\to\pi^+\pi^- and (\rho^0, \omega)\to\pi^0\gamma, the pair of
decays to e^+e^- and the whole set of radiative decays with participation of
\rho^0, \omega (in initial or final states) are shown to be also useful and
perspective for studies. Existing data on these decays agree with the universal
character of the mixing parameter and indirectly support enhancement of
\rho^0\to\pi^0\gamma in respect to \rho^{\pm}\to\pi^{\pm}\gamma. Future precise
measurements will allow to separate different forms of isospin violation and
elucidate their mechanisms.
|
[
{
"created": "Sun, 26 Jan 2003 10:15:03 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Azimov",
"Ya. I.",
""
]
] |
Influence of the isospin-violating (\rho^0, \omega)-mixing is discussed for any pair of decays of \rho^0, \omega into the same final state. It is demonstrated, in analogy to the CP-violation in neutral kaon decays, that isospin violation can manifest itself in various forms: direct violation in amplitudes and/or violation due to mixing. In addition to the known decays (\rho^0, \omega)\to\pi^+\pi^- and (\rho^0, \omega)\to\pi^0\gamma, the pair of decays to e^+e^- and the whole set of radiative decays with participation of \rho^0, \omega (in initial or final states) are shown to be also useful and perspective for studies. Existing data on these decays agree with the universal character of the mixing parameter and indirectly support enhancement of \rho^0\to\pi^0\gamma in respect to \rho^{\pm}\to\pi^{\pm}\gamma. Future precise measurements will allow to separate different forms of isospin violation and elucidate their mechanisms.
|
hep-ph/9809552
|
Sreerup Raychaudhuri
|
Debajyoti Choudhury, Anindya Datta and Sreerup Raychaudhuri
|
Higgs Boson Signals in Three b-jet Final States at the Fermilab Tevatron
|
4 pages, 4 postscript figures, RevTeX (style files included)
| null | null |
CERN-TH/98-316
|
hep-ph
| null |
At the Fermilab Tevatron, final states with three tagged b-jets could play an
important role in searches for a Higgs boson with mass in the range 100-300
GeV. These signals arise from gb fusion and we demonstrate their observability
in the limit of a large b-quark Yukawa coupling. Rather promising discovery
limits on such a coupling are obtained and consequent effects on the parameter
space of the Higgs-boson sector in the MSSM are discussed.
|
[
{
"created": "Sat, 26 Sep 1998 20:37:31 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Choudhury",
"Debajyoti",
""
],
[
"Datta",
"Anindya",
""
],
[
"Raychaudhuri",
"Sreerup",
""
]
] |
At the Fermilab Tevatron, final states with three tagged b-jets could play an important role in searches for a Higgs boson with mass in the range 100-300 GeV. These signals arise from gb fusion and we demonstrate their observability in the limit of a large b-quark Yukawa coupling. Rather promising discovery limits on such a coupling are obtained and consequent effects on the parameter space of the Higgs-boson sector in the MSSM are discussed.
|
1901.06747
|
C. Q. Geng
|
Yow-Chun Chen, Chao-Qiang Geng, Chung-Chi Lee and Hongwei Yu
|
Matter Power Spectra in Viable $f(R)$ Gravity Models with Dynamical
Background
|
16 pages, 4 figures, to be published at EPJC
|
Eur. Phys. J. C79 (2019) 93
|
10.1140/epjc/s10052-019-6613-y
| null |
gr-qc astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the matter power spectra in the viable $f(R)$ gravity models with
the dynamical background evolution and linear perturbation theory by using the
CosmoMC package. We show that these viable $f(R)$ models generally shorten the
age of the universe and suppress the matter density fluctuation. We examine the
allowed ranges of the model parameters and the constraints of the cosmological
variables from the current observational data, and find that the dynamical
evolution of $\rho_{DE}(z)$ plays an important role to constrain the neutrino
masses.
|
[
{
"created": "Sun, 20 Jan 2019 23:20:45 GMT",
"version": "v1"
}
] |
2019-02-01
|
[
[
"Chen",
"Yow-Chun",
""
],
[
"Geng",
"Chao-Qiang",
""
],
[
"Lee",
"Chung-Chi",
""
],
[
"Yu",
"Hongwei",
""
]
] |
We study the matter power spectra in the viable $f(R)$ gravity models with the dynamical background evolution and linear perturbation theory by using the CosmoMC package. We show that these viable $f(R)$ models generally shorten the age of the universe and suppress the matter density fluctuation. We examine the allowed ranges of the model parameters and the constraints of the cosmological variables from the current observational data, and find that the dynamical evolution of $\rho_{DE}(z)$ plays an important role to constrain the neutrino masses.
|
1312.3331
|
Shaouly Bar-Shalom
|
Michael Geller, Shaouly Bar-Shalom, Amarjit Soni
|
Higgs-radion unification: radius stabilization by an SU(2) bulk doublet
and the 126 GeV scalar
|
latex, 23 pages, 2 figures, 2 tables. In V2: 2 figures and 1 table
added, new references added and differences with previous works are further
elaborated
|
Phys. Rev. D 89, 095015 (2014)
|
10.1103/PhysRevD.89.095015
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate a Randall-Sundrum model with an SU(2) doublet propagating in
the bulk. Upon calculating its gravitational effect we find that a stabilized
radius can be generated without the use of an additional scalar, as needed for
example in the Goldberger-Wise (GW) mechanism, and with no additional
fine-tuning other than the inescapable one due to the cosmological constant;
similar tuning is also present in the GW mechanism. The lowest scalar
excitation in this scenario, the counterpart of the radion of the GW mechanism,
has both radion-like and Higgs-like couplings to the SM fields. It, thus, plays
a dual role and we, therefore, denote it as the "Higgs-radion" ($h_r$). As
opposed to the GW radion case, our Higgs-radion is found to be compatible with
the 126 GeV scalar recently discovered at the LHC, at the level of $1\sigma$,
with a resulting $95\%$ CL bound on the KK-gluon mass of: $4.48~TeV<M_{KKG}<
5.44~TeV$. An important consequence of our setup should be accentuated: the
radion of the traditional RS scenarios simply does not exist, so that our
Higgs-radion is not the conventional mixed state between the GW radion and the
Higgs.
|
[
{
"created": "Wed, 11 Dec 2013 21:00:15 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Jan 2014 20:11:54 GMT",
"version": "v2"
}
] |
2014-05-21
|
[
[
"Geller",
"Michael",
""
],
[
"Bar-Shalom",
"Shaouly",
""
],
[
"Soni",
"Amarjit",
""
]
] |
We investigate a Randall-Sundrum model with an SU(2) doublet propagating in the bulk. Upon calculating its gravitational effect we find that a stabilized radius can be generated without the use of an additional scalar, as needed for example in the Goldberger-Wise (GW) mechanism, and with no additional fine-tuning other than the inescapable one due to the cosmological constant; similar tuning is also present in the GW mechanism. The lowest scalar excitation in this scenario, the counterpart of the radion of the GW mechanism, has both radion-like and Higgs-like couplings to the SM fields. It, thus, plays a dual role and we, therefore, denote it as the "Higgs-radion" ($h_r$). As opposed to the GW radion case, our Higgs-radion is found to be compatible with the 126 GeV scalar recently discovered at the LHC, at the level of $1\sigma$, with a resulting $95\%$ CL bound on the KK-gluon mass of: $4.48~TeV<M_{KKG}< 5.44~TeV$. An important consequence of our setup should be accentuated: the radion of the traditional RS scenarios simply does not exist, so that our Higgs-radion is not the conventional mixed state between the GW radion and the Higgs.
|
hep-ph/0409093
|
Carlos Garcia Canal
|
C.A. Garcia Canal
|
Summary of the Latin American Workshop on Fundamental Interactions
|
10 pages
| null | null | null |
hep-ph
| null |
Summary of the Latin American Workshop on Fundamental Interactions held at
the Physics Department of the Universidad de Buenos Aires from 26 to 30 July
2004.
|
[
{
"created": "Wed, 8 Sep 2004 15:37:03 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Canal",
"C. A. Garcia",
""
]
] |
Summary of the Latin American Workshop on Fundamental Interactions held at the Physics Department of the Universidad de Buenos Aires from 26 to 30 July 2004.
|
1611.06136
|
Markus Huber Q.
|
Markus Q. Huber
|
An exploratory study of Yang-Mills three-point functions at non-zero
temperature
|
8 pages, 8 figures, submitted to proceedings of 'XIIth Quark
Confinement and the Hadron Spectrum', August 28-September 04, 2016,
Thessaloniki, Greece
| null |
10.1051/epjconf/201713707009
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Results for three-point functions of Landau gauge Yang-Mills theory at
non-vanishing temperature are presented and compared to lattice results. It is
found that the three-gluon vertex is enhanced for temperatures below the phase
transition. At very low momenta it becomes negative for all temperatures.
Furthermore, truncation effects in functional equations are discussed at the
example of three-dimensional Yang-Mills theory for which a self-contained
solution is presented.
|
[
{
"created": "Fri, 18 Nov 2016 16:02:01 GMT",
"version": "v1"
}
] |
2017-04-05
|
[
[
"Huber",
"Markus Q.",
""
]
] |
Results for three-point functions of Landau gauge Yang-Mills theory at non-vanishing temperature are presented and compared to lattice results. It is found that the three-gluon vertex is enhanced for temperatures below the phase transition. At very low momenta it becomes negative for all temperatures. Furthermore, truncation effects in functional equations are discussed at the example of three-dimensional Yang-Mills theory for which a self-contained solution is presented.
|
1812.09665
|
Hong-Shi Zong
|
Zhao Ya-Peng, Yin Pei-Lin, Yu Zhen-Hua, and Zong Hong-Shi
|
Finite volume effects on chiral phase transition and pseudoscalar mesons
properties from the Polyakov-Nambu-Jona-Lasinio model
|
8 pages, 11 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Within the framework of Polyakov-Nambu-Jona-Lasinio model and by means of
Multiple Reflection Expansion, we study the finite volume effects on chiral
phase transition, especially its influence on the location of the possible
critical end point (CEP) and masses of mesons. Our result shows that as the
radius of spherical volume decreases, the location of CEP shifts toward smaller
temperature while changes little in chemical potential. As for the finite
volume effects on the masses of mesons, the masses of $\pi$ and $K$ increase
with decreasing volume, while for $\sigma$, $\eta$ and $\eta '$ the situation
is the opposite. Especially, the masses of chiral parters $\pi$ and $\sigma$
get closer as the volume decreases, indicating that the dynamical chiral
symmetry breaking effect reduces with decreasing volume.
|
[
{
"created": "Sun, 23 Dec 2018 07:14:14 GMT",
"version": "v1"
}
] |
2018-12-27
|
[
[
"Ya-Peng",
"Zhao",
""
],
[
"Pei-Lin",
"Yin",
""
],
[
"Zhen-Hua",
"Yu",
""
],
[
"Hong-Shi",
"Zong",
""
]
] |
Within the framework of Polyakov-Nambu-Jona-Lasinio model and by means of Multiple Reflection Expansion, we study the finite volume effects on chiral phase transition, especially its influence on the location of the possible critical end point (CEP) and masses of mesons. Our result shows that as the radius of spherical volume decreases, the location of CEP shifts toward smaller temperature while changes little in chemical potential. As for the finite volume effects on the masses of mesons, the masses of $\pi$ and $K$ increase with decreasing volume, while for $\sigma$, $\eta$ and $\eta '$ the situation is the opposite. Especially, the masses of chiral parters $\pi$ and $\sigma$ get closer as the volume decreases, indicating that the dynamical chiral symmetry breaking effect reduces with decreasing volume.
|
hep-ph/0207169
| null |
M. I. Kotsky, L. N. Lipatov, A. Principe, M. I. Vyazovsky
|
Radiative corrections to the quark-gluon-Reggeized quark vertex in QCD
|
13 pages, LaTeX, uses axodraw.sty
|
Nucl.Phys. B648 (2003) 277-292
|
10.1016/S0550-3213(02)00967-7
|
BUDKERINP /2002-32
|
hep-ph
| null |
This paper is devoted to the calculation of the quark-gluon-Reggeized quark
effective vertex in perturbative QCD in the next-to-leading order. The case of
QCD with massive quarks is considered. This vertex has a number of
applications, in particular, the result can be used for determination of the
next-to-leading correction to the massive Reggeized quark trajectory.
|
[
{
"created": "Sun, 14 Jul 2002 02:55:48 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Kotsky",
"M. I.",
""
],
[
"Lipatov",
"L. N.",
""
],
[
"Principe",
"A.",
""
],
[
"Vyazovsky",
"M. I.",
""
]
] |
This paper is devoted to the calculation of the quark-gluon-Reggeized quark effective vertex in perturbative QCD in the next-to-leading order. The case of QCD with massive quarks is considered. This vertex has a number of applications, in particular, the result can be used for determination of the next-to-leading correction to the massive Reggeized quark trajectory.
|
0709.3046
|
Maksim Nekrasov L
|
M. L. Nekrasov
|
Modified perturbation theory for pair production and decay of
fundamental unstable particles
|
32 pages, matches IJMPA version
|
Int.J.Mod.Phys.A24:6071-6103,2009
|
10.1142/S0217751X09047673
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We construct an asymptotic expansion in powers of the coupling constant
directly of the cross-section for pair production and decay of fundamental
unstable particles. The resonant and kinematic singularities arising in the
expansion we treat in the sense of distributions. This mode allows us to
transform formally divergent integrals into absolutely convergent ones with
keeping the asymptotic property of the expansion. The appropriate procedure is
elaborated up to an arbitrary order of the expansion. The peculiarity of
application of the procedure in the threshold region is analysed. The scheme of
the calculations within the NNLO approximation is explicitly discussed.
|
[
{
"created": "Wed, 19 Sep 2007 15:38:20 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Sep 2007 16:42:14 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Sep 2008 16:12:11 GMT",
"version": "v3"
},
{
"created": "Fri, 4 Dec 2009 16:03:39 GMT",
"version": "v4"
}
] |
2010-01-21
|
[
[
"Nekrasov",
"M. L.",
""
]
] |
We construct an asymptotic expansion in powers of the coupling constant directly of the cross-section for pair production and decay of fundamental unstable particles. The resonant and kinematic singularities arising in the expansion we treat in the sense of distributions. This mode allows us to transform formally divergent integrals into absolutely convergent ones with keeping the asymptotic property of the expansion. The appropriate procedure is elaborated up to an arbitrary order of the expansion. The peculiarity of application of the procedure in the threshold region is analysed. The scheme of the calculations within the NNLO approximation is explicitly discussed.
|
hep-ph/9810373
|
Helen Bukina
|
E.N. Bukina, V.M. Dubovik and V.S. Zamiralov
|
Generalized Gordon Identities, Hara Theorem and Weak Radiative Hyperon
Decays
|
LaTex, 7 pages, 2 tables added, text also changed
|
Phys.Lett. B449 (1999) 93-96
|
10.1016/S0370-2693(99)00045-3
| null |
hep-ph
| null |
It is shown that an alternative form of the parity-nonconserving (PNC)
transition electromagnetic current resolves partly a puzzle with the Hara
theorem. New formulation of it has allowed PNC weak radiative hyperon
transitions of the charged hyperons $\Sigma^{+} \Rightarrow p + \gamma $ and
$\Xi^{-} \Rightarrow \Sigma^{-} + \gamma $ revealing hitherto unseen transition
toroid dipole moment.
|
[
{
"created": "Thu, 15 Oct 1998 15:59:53 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Oct 1998 11:56:32 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Bukina",
"E. N.",
""
],
[
"Dubovik",
"V. M.",
""
],
[
"Zamiralov",
"V. S.",
""
]
] |
It is shown that an alternative form of the parity-nonconserving (PNC) transition electromagnetic current resolves partly a puzzle with the Hara theorem. New formulation of it has allowed PNC weak radiative hyperon transitions of the charged hyperons $\Sigma^{+} \Rightarrow p + \gamma $ and $\Xi^{-} \Rightarrow \Sigma^{-} + \gamma $ revealing hitherto unseen transition toroid dipole moment.
|
hep-ph/9508327
| null |
L. Ya. Glozman, D.O. Riska
|
Quark Model Explanation of the $N^*\to N\eta$ Branching Ratios
|
Latex 7 p, no figures
|
Phys.Lett. B366 (1996) 305-310
|
10.1016/0370-2693(95)01369-5
|
HU--TFT--95--49
|
hep-ph
| null |
The constituent quark model can explain the strong selectivity of the $N\eta$
decay branching ratios of the nucleon resonances if the fine structure
interaction between the constituent quarks is described in terms of Goldstone
boson exchange. This chiral quark model predicts that the resonances $N(1535)$,
$N(1710)$, $\Lambda(1670)$, $\Sigma(1750)$, which have mixed flavor and spin
symmetry $[21]_{FS} [21]_F [21]_S$ wavefunctions in lowest order, should have
large $N\eta$ branching ratios, while $N\eta$ decay of the other resonances
that have different flavor-spin symmetry should be strongly suppressed in
agreement with the experimental branching ratios.
|
[
{
"created": "Fri, 18 Aug 1995 09:58:00 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Glozman",
"L. Ya.",
""
],
[
"Riska",
"D. O.",
""
]
] |
The constituent quark model can explain the strong selectivity of the $N\eta$ decay branching ratios of the nucleon resonances if the fine structure interaction between the constituent quarks is described in terms of Goldstone boson exchange. This chiral quark model predicts that the resonances $N(1535)$, $N(1710)$, $\Lambda(1670)$, $\Sigma(1750)$, which have mixed flavor and spin symmetry $[21]_{FS} [21]_F [21]_S$ wavefunctions in lowest order, should have large $N\eta$ branching ratios, while $N\eta$ decay of the other resonances that have different flavor-spin symmetry should be strongly suppressed in agreement with the experimental branching ratios.
|
1903.00280
|
Bert Janssen
|
Bert Janssen, Alejandro Jimenez-Cano, Jose Alberto Orejuela
|
A non-trivial connection for the metric-affine Gauss-Bonnet theory in $D
= 4$
|
13 pages, 1 figure. v2: References added. v3: 14 pages. Minor
changes, references added. Version to be published in Phys.Lett.B
|
Phys. Lett. B795 (2019) 42-48
|
10.1016/j.physletb.2019.06.002
| null |
gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study non-trivial (i.e. non-Levi-Civita) connections in metric-affine
Lovelock theories. First we study the projective invariance of general Lovelock
actions and show that all connections constructed by acting with a projective
transformation of the Levi-Civita connection are allowed solutions, albeit
physically equivalent to Levi-Civita. We then show that the (non-integrable)
Weyl connection is also a solution for the specific case of the
four-dimensional metric-affine Gauss-Bonnet action, for arbritrary vector
fields. The existence of this solution is related to a two-vector family of
transformations, that leaves the Gauss-Bonnet action invariant when acting on
metric-compatible connections. We argue that this solution is physically
inequivalent to the Levi-Civita connection, giving thus a counterexample to the
statement that the metric and the Palatini formalisms are equivalent for
Lovelock gravities. We discuss the mathematical structure of the set of
solutions within the space of connections.
|
[
{
"created": "Fri, 1 Mar 2019 13:16:11 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Mar 2019 16:25:06 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Jun 2019 07:00:16 GMT",
"version": "v3"
}
] |
2019-06-17
|
[
[
"Janssen",
"Bert",
""
],
[
"Jimenez-Cano",
"Alejandro",
""
],
[
"Orejuela",
"Jose Alberto",
""
]
] |
We study non-trivial (i.e. non-Levi-Civita) connections in metric-affine Lovelock theories. First we study the projective invariance of general Lovelock actions and show that all connections constructed by acting with a projective transformation of the Levi-Civita connection are allowed solutions, albeit physically equivalent to Levi-Civita. We then show that the (non-integrable) Weyl connection is also a solution for the specific case of the four-dimensional metric-affine Gauss-Bonnet action, for arbritrary vector fields. The existence of this solution is related to a two-vector family of transformations, that leaves the Gauss-Bonnet action invariant when acting on metric-compatible connections. We argue that this solution is physically inequivalent to the Levi-Civita connection, giving thus a counterexample to the statement that the metric and the Palatini formalisms are equivalent for Lovelock gravities. We discuss the mathematical structure of the set of solutions within the space of connections.
|
hep-ph/9811317
|
Nico Schoonderwoerd
|
Nico Schoonderwoerd (Vrije Universiteit Amsterdam)
|
Light-front Hamiltonian field theory. Towards a relativistic description
of bound states
|
Ph.D. Thesis, 120 pages, many figures, uses mythesis.cls fancyhdr.sty
(included), on request free hard copies are available (December)
| null | null | null |
hep-ph hep-th nucl-th
| null |
My thesis contains an introduction to Light-front Hamiltonian field theory
and updates of published articles: - "Equivalence of Covariant and Light-Front
Perturbation Theory" (hep-ph/9702311 and hep-ph/9806365, N. C. J.
Schoonderwoerd and B. L. G. Bakker, published in Phys.Rev.D) and -
"Entanglement of Fock-space expansion and covariance in light-front Hamiltonian
field theory" (hep-ph/9806365, N. C. J. Schoonderwoerd, B. L. G. Bakker and
V.A. Karmanov, accepted for publication in Phys.Rev.C.)
|
[
{
"created": "Fri, 13 Nov 1998 19:29:28 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Schoonderwoerd",
"Nico",
"",
"Vrije Universiteit Amsterdam"
]
] |
My thesis contains an introduction to Light-front Hamiltonian field theory and updates of published articles: - "Equivalence of Covariant and Light-Front Perturbation Theory" (hep-ph/9702311 and hep-ph/9806365, N. C. J. Schoonderwoerd and B. L. G. Bakker, published in Phys.Rev.D) and - "Entanglement of Fock-space expansion and covariance in light-front Hamiltonian field theory" (hep-ph/9806365, N. C. J. Schoonderwoerd, B. L. G. Bakker and V.A. Karmanov, accepted for publication in Phys.Rev.C.)
|
2009.07732
|
Tanmoy Paul
|
Tanmoy Paul
|
Antisymmetric tensor fields in modified gravity: a summary
|
Invited review paper from Symmetry for special issue Feature Papers
2020, Symmetry Accepted
| null | null | null |
gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We provide various aspects of second rank antisymmetric Kalb-Ramond (KR)
field in modified theories of gravity. The KR field energy density is found to
decrease with the expansion of our universe at a faster rate in comparison to
radiation and matter components. Thus as the Universe evolves and cools down,
the contribution of the KR field on the evolutionary process reduces
significantly, and at present it almost does not affect the universe evolution.
However the KR field has a significant contribution during early universe, in
particular, it affects the beginning of inflation as well as increases the
amount of primordial gravitational radiation and hence enlarges the value of
tensor to scalar ratio in respect to the case when the KR field is absent. In
regard to the KR field couplings, it turns out that in four dimensional higher
curvature inflationary model the couplings of the KR field to other matter
fields is given by $1/M_{Pl}$ i.e same as the usual gravity-matter coupling.
However in higher dimensional higher curvature model the KR couplings get an
additional suppression over $1/M_{Pl}$ and thus gives a better explanation of
why the present universe carries practically no footprint of the Kalb-Ramond
field in comparison to the 4D higher curvature model. The higher curvature term
in 5D action acts as a suitable stabilizing agent in the dynamical
stabilization mechanism of the extra dimensional modulus field from the
perspective of effective on-brane theory. Based on the evolution of KR field,
one intriguing question can be - sitting in present day universe, how do we
confirm the existence of the Kalb-Ramond field which has considerably low
energy density in our present universe but has a significant impact during
early universe ? We try to answer this question by the phenomena "cosmological
quantum entanglement" which indeed carries the information of early universe.
|
[
{
"created": "Wed, 16 Sep 2020 15:05:21 GMT",
"version": "v1"
}
] |
2020-09-17
|
[
[
"Paul",
"Tanmoy",
""
]
] |
We provide various aspects of second rank antisymmetric Kalb-Ramond (KR) field in modified theories of gravity. The KR field energy density is found to decrease with the expansion of our universe at a faster rate in comparison to radiation and matter components. Thus as the Universe evolves and cools down, the contribution of the KR field on the evolutionary process reduces significantly, and at present it almost does not affect the universe evolution. However the KR field has a significant contribution during early universe, in particular, it affects the beginning of inflation as well as increases the amount of primordial gravitational radiation and hence enlarges the value of tensor to scalar ratio in respect to the case when the KR field is absent. In regard to the KR field couplings, it turns out that in four dimensional higher curvature inflationary model the couplings of the KR field to other matter fields is given by $1/M_{Pl}$ i.e same as the usual gravity-matter coupling. However in higher dimensional higher curvature model the KR couplings get an additional suppression over $1/M_{Pl}$ and thus gives a better explanation of why the present universe carries practically no footprint of the Kalb-Ramond field in comparison to the 4D higher curvature model. The higher curvature term in 5D action acts as a suitable stabilizing agent in the dynamical stabilization mechanism of the extra dimensional modulus field from the perspective of effective on-brane theory. Based on the evolution of KR field, one intriguing question can be - sitting in present day universe, how do we confirm the existence of the Kalb-Ramond field which has considerably low energy density in our present universe but has a significant impact during early universe ? We try to answer this question by the phenomena "cosmological quantum entanglement" which indeed carries the information of early universe.
|
2311.04680
|
Rabia Saleem
|
Xiao-Xiong Zeng, M. Israr Aslam, Rabia Saleem, Xin-Yun Hu
|
Holographic Einstein Rings of Black Holes in Scalar-Tensor-Vector
Gravity
|
19 pages, 19 figures
| null | null | null |
gr-qc
|
http://creativecommons.org/publicdomain/zero/1.0/
|
With the help of AdS/CFT correspondence, we analyze the holographic Einstein
images via the response function of the complex scalar field as a probe wave on
the AdS Schwarzschild scalar-tensor-vector gravity (STVG) black hole (BH). We
find that the amplitude of the response function $|\langle O\rangle|$ decreases
with the increasing values of the coupling parameter $\alpha$, while it
increases with the decreasing values of temperature $T$. The frequency $\omega$
of the wave source also plays a significant role in wave periods, as we
increase the values of $\omega$, we find a decrease in periods of waves, which
means that the total response function closely depends on the wave source.
Further, we investigate the optical appearance of the holographic images of the
BH in bulk. We found that the holographic ring always appears with the
concentric stripe surrounded when the observer is located at the north pole,
and an extremely bright ring appears when the observer is at the position of
the photon sphere of the BH. With the change of the observational angle, this
ring will change into a luminosity-deformed ring or a bright light spot. The
corresponding brightness profiles show that the luminosity of the ring
decreases, and the shadow radius increases with increasing values of $\alpha$.
The relation between temperature $T$ and the inverse of the horizon $h_{e}$ is
discussed, which shows the smaller values at the beginning of the horizon
$h_{e}$, and then increases as the horizon radius increases. This effect can be
used to distinguish the STVG BH solution from other BH solutions. Moreover,
these significant features are also reflected in the Einstein ring and the
corresponding brightness profiles. In addition, we compare the results obtained
by wave optics and geometric optics, which are aligned well, implying that the
holographic scheme adopted in this paper is valid.
|
[
{
"created": "Wed, 8 Nov 2023 13:39:19 GMT",
"version": "v1"
}
] |
2023-11-09
|
[
[
"Zeng",
"Xiao-Xiong",
""
],
[
"Aslam",
"M. Israr",
""
],
[
"Saleem",
"Rabia",
""
],
[
"Hu",
"Xin-Yun",
""
]
] |
With the help of AdS/CFT correspondence, we analyze the holographic Einstein images via the response function of the complex scalar field as a probe wave on the AdS Schwarzschild scalar-tensor-vector gravity (STVG) black hole (BH). We find that the amplitude of the response function $|\langle O\rangle|$ decreases with the increasing values of the coupling parameter $\alpha$, while it increases with the decreasing values of temperature $T$. The frequency $\omega$ of the wave source also plays a significant role in wave periods, as we increase the values of $\omega$, we find a decrease in periods of waves, which means that the total response function closely depends on the wave source. Further, we investigate the optical appearance of the holographic images of the BH in bulk. We found that the holographic ring always appears with the concentric stripe surrounded when the observer is located at the north pole, and an extremely bright ring appears when the observer is at the position of the photon sphere of the BH. With the change of the observational angle, this ring will change into a luminosity-deformed ring or a bright light spot. The corresponding brightness profiles show that the luminosity of the ring decreases, and the shadow radius increases with increasing values of $\alpha$. The relation between temperature $T$ and the inverse of the horizon $h_{e}$ is discussed, which shows the smaller values at the beginning of the horizon $h_{e}$, and then increases as the horizon radius increases. This effect can be used to distinguish the STVG BH solution from other BH solutions. Moreover, these significant features are also reflected in the Einstein ring and the corresponding brightness profiles. In addition, we compare the results obtained by wave optics and geometric optics, which are aligned well, implying that the holographic scheme adopted in this paper is valid.
|
gr-qc/0510073
|
Sunil Maharaj
|
S.D. Maharaj and M. Chaisi
|
New anisotropic models from isotropic solutions
|
23 pages, To appear in Math. Meth. Appl. Sci
|
Math.Methods Appl.Sci. 29 (2006) 67-83
|
10.1002/mma.665
| null |
gr-qc
| null |
We establish an algorithm that produces a new solution to the Einstein field
equations, with an anisotropic matter distribution, from a given seed isotropic
solution. The new solution is expressed in terms of integrals of known
functions, and the integration can be completed in principle. The applicability
of this technique is demonstrated by generating anisotropic isothermal spheres
and anisotropic constant density Schwarzschild spheres. Both of these solutions
are expressed in closed form in terms of elementary functions, and this
facilitates physical analysis.
|
[
{
"created": "Sun, 16 Oct 2005 06:49:16 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Maharaj",
"S. D.",
""
],
[
"Chaisi",
"M.",
""
]
] |
We establish an algorithm that produces a new solution to the Einstein field equations, with an anisotropic matter distribution, from a given seed isotropic solution. The new solution is expressed in terms of integrals of known functions, and the integration can be completed in principle. The applicability of this technique is demonstrated by generating anisotropic isothermal spheres and anisotropic constant density Schwarzschild spheres. Both of these solutions are expressed in closed form in terms of elementary functions, and this facilitates physical analysis.
|
0910.0282
|
Arundhati Dasgupta
|
Arundhati Dasgupta
|
Quantum Gravity Effects on Unstable Orbits in Schwarzschild Space-time
|
12 pages; published version
|
JCAP 1005:011,2010
|
10.1088/1475-7516/2010/05/011
| null |
gr-qc astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study semiclassical corrections to the Schwarzchild metric, and their
effects on unstable orbits.
|
[
{
"created": "Thu, 1 Oct 2009 22:18:58 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Oct 2010 21:28:54 GMT",
"version": "v2"
}
] |
2010-10-27
|
[
[
"Dasgupta",
"Arundhati",
""
]
] |
We study semiclassical corrections to the Schwarzchild metric, and their effects on unstable orbits.
|
hep-ph/0012176
|
Robert Harlander
|
Robert Harlander and William Kilgore
|
Higgs production in gluon fusion to order \alpha_s^4
|
3+2 pages, AMS-LaTeX. Talk given by RH at the Meeting of the Division
of Particles and Fields of the American Physical Society (DPF2000), Columbus,
Ohio, August 9--12, 2000
|
Int.J.Mod.Phys. A16S1A (2001) 305-307
|
10.1142/S0217751X01006760
|
BNL-HET-00/44
|
hep-ph
| null |
The calculation of the NNLO QCD corrections to the partonic process gg -> H
is outlined. For the coupling of the Higgs boson to the gluons we use an
effective Lagrangian in the limit of a heavy top quark. The focus is on the
evaluation of the virtual two-loop corrections. It is shown that the leading
pole terms are in agreement with the general formula by Catani.
|
[
{
"created": "Thu, 14 Dec 2000 19:15:28 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Harlander",
"Robert",
""
],
[
"Kilgore",
"William",
""
]
] |
The calculation of the NNLO QCD corrections to the partonic process gg -> H is outlined. For the coupling of the Higgs boson to the gluons we use an effective Lagrangian in the limit of a heavy top quark. The focus is on the evaluation of the virtual two-loop corrections. It is shown that the leading pole terms are in agreement with the general formula by Catani.
|
1401.6323
|
Long-Bin Chen
|
Long-Bin Chen and Cong-Feng Qiao
|
NLO corrections to $\chi_{bJ}$ to two-$J/\psi$ exclusive decay processes
|
To appear in PRD
|
Phys. Rev. D 89, 074004 (2014)
|
10.1103/PhysRevD.89.074004
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The next-to-leading order QCD corrections for $\chi_{bJ}$, the p-wave
bottomonium, to $J/\psi$ pair decay processes are evaluated utilizing NRQCD
factorization formalism. The scale dependence of $\chi_{b2}\rightarrow J/\psi
J/\psi$ process is depressed with NLO corrections, and hence the uncertainties
in the leading order results are greatly reduced. The total branch ratios are
found to be the order of $10^{-5}$ for all three $\chi_{bJ}\rightarrow J/\psi
J/\psi$ processes, indicating that they are observable in the LHC and super-B
experiments.
|
[
{
"created": "Fri, 24 Jan 2014 12:05:02 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Mar 2014 01:25:28 GMT",
"version": "v2"
}
] |
2014-04-23
|
[
[
"Chen",
"Long-Bin",
""
],
[
"Qiao",
"Cong-Feng",
""
]
] |
The next-to-leading order QCD corrections for $\chi_{bJ}$, the p-wave bottomonium, to $J/\psi$ pair decay processes are evaluated utilizing NRQCD factorization formalism. The scale dependence of $\chi_{b2}\rightarrow J/\psi J/\psi$ process is depressed with NLO corrections, and hence the uncertainties in the leading order results are greatly reduced. The total branch ratios are found to be the order of $10^{-5}$ for all three $\chi_{bJ}\rightarrow J/\psi J/\psi$ processes, indicating that they are observable in the LHC and super-B experiments.
|
1203.3625
|
Evangelos Matsinos
|
Evangelos Matsinos, Guenther Rasche
|
Analysis of the low-energy $\pi^\pm p$ elastic-scattering data
|
J. Mod. Phys. 3 (2012) 1369-87
| null |
10.4236/jmp.2012.310174
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report the results of a phase-shift analysis (PSA) of the low-energy
$\pi^\pm p$ elastic-scattering data. Following the method which we had set
forth in our previous PSA (Matsinos et al., 2006), we first investigate the
self-consistency of the low-energy $\pi^\pm p$ elastic-scattering databases,
via two separate analyses of (first) the $\pi^+ p$ and (subsequently) the
$\pi^- p$ elastic-scattering data. There are two main differences to our
previous PSA: a) we now perform only one test for the acceptance of each data
set (based on its contribution to the overall $\chi^2$) and b) we adopt a more
stringent acceptance criterion in the statistical tests. We show that it is
possible to obtain self-consistent databases after removing a very small amount
of the data (4.57% of the initial database). We subsequently fit the ETH model
(Goudsmit et al. 1994) to the truncated $\pi^\pm p$ elastic-scattering
databases. The model-parameter values show reasonable stability when subjected
to different criteria for the rejection of single data points and entire data
sets. Our result for the pseudovector $\pi N N$ coupling constant is $0.0726
\pm 0.0014$. We extract the scattering lengths and volumes, as well as the s-
and p-wave hadronic phase shifts up to T=100 MeV. Large differences in the
s-wave part of the interaction can be seen when comparing our hadronic phase
shifts with the current SAID solution (WI08); there is general agreement in the
p waves, save for the $\tilde{\delta}_{1-}^{1/2}$ hadronic phase shift.
|
[
{
"created": "Fri, 16 Mar 2012 07:25:26 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Aug 2012 15:47:30 GMT",
"version": "v2"
},
{
"created": "Wed, 31 Oct 2012 16:20:20 GMT",
"version": "v3"
}
] |
2015-06-04
|
[
[
"Matsinos",
"Evangelos",
""
],
[
"Rasche",
"Guenther",
""
]
] |
We report the results of a phase-shift analysis (PSA) of the low-energy $\pi^\pm p$ elastic-scattering data. Following the method which we had set forth in our previous PSA (Matsinos et al., 2006), we first investigate the self-consistency of the low-energy $\pi^\pm p$ elastic-scattering databases, via two separate analyses of (first) the $\pi^+ p$ and (subsequently) the $\pi^- p$ elastic-scattering data. There are two main differences to our previous PSA: a) we now perform only one test for the acceptance of each data set (based on its contribution to the overall $\chi^2$) and b) we adopt a more stringent acceptance criterion in the statistical tests. We show that it is possible to obtain self-consistent databases after removing a very small amount of the data (4.57% of the initial database). We subsequently fit the ETH model (Goudsmit et al. 1994) to the truncated $\pi^\pm p$ elastic-scattering databases. The model-parameter values show reasonable stability when subjected to different criteria for the rejection of single data points and entire data sets. Our result for the pseudovector $\pi N N$ coupling constant is $0.0726 \pm 0.0014$. We extract the scattering lengths and volumes, as well as the s- and p-wave hadronic phase shifts up to T=100 MeV. Large differences in the s-wave part of the interaction can be seen when comparing our hadronic phase shifts with the current SAID solution (WI08); there is general agreement in the p waves, save for the $\tilde{\delta}_{1-}^{1/2}$ hadronic phase shift.
|
hep-ph/0111366
|
Rouzbeh Allahverdi
|
Rouzbeh Allahverdi, Mar Bastero-Gil, Anupam Mazumdar
|
Is inflatino production during preheating a threat to nucleosynthesis?
|
8 pages, talk given at COSMO-01, Rovaniemi, Finland, August
30-September 4, 2001
| null | null | null |
hep-ph
| null |
We discuss the production of inflatino the superpartner of the inflaton due
to vacuum fluctuations during preheating and argue that they do decay alongwith
the inflaton to produce a thermal bath. Therefore they do not survive until
nucleosynthsis to pose a threat to it.
|
[
{
"created": "Wed, 28 Nov 2001 10:53:30 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Allahverdi",
"Rouzbeh",
""
],
[
"Bastero-Gil",
"Mar",
""
],
[
"Mazumdar",
"Anupam",
""
]
] |
We discuss the production of inflatino the superpartner of the inflaton due to vacuum fluctuations during preheating and argue that they do decay alongwith the inflaton to produce a thermal bath. Therefore they do not survive until nucleosynthsis to pose a threat to it.
|
1011.2839
|
Daijiro Suematsu
|
Daijiro Suematsu and Takashi Toma
|
Dark matter in the supersymmetric radiative seesaw model with an
anomalous U(1) symmetry
|
32 pages, 9 figures, the estimation of relic abundance of LSP
improved and 4 figures replaced, conclusions unchanged, typos corrected,
references added, a final version for publication in Nucl. Phys. B
|
Nucl.Phys.B847:567-589,2011
|
10.1016/j.nuclphysb.2011.02.007
|
KANAZAWA-10-09
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The existence of an anomalous U(1) symmetry is shown to play a crucial role
in the supersymmetric radiative seesaw model for neutrino masses. It explains
the smallness of some couplings related to neutrino mass generation in a
favorable way in addition to cause the hierarchical structure of Yukawa
couplings of quarks and leptons. If it is spontaneously broken to a $Z_2$
subgroup, this $Z_2$ symmetry can make a lifetime of the lightest field with
its odd parity extremely long. Thus, the model has an additional dark matter
candidate other than the lightest neutralino, which appears in the $R$-parity
conserved MSSM. We discuss the nature of dark matter by taking account of its
relation to the neutrino mass generation and the lepton flavor violation.
|
[
{
"created": "Fri, 12 Nov 2010 07:49:02 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Mar 2011 01:27:30 GMT",
"version": "v2"
}
] |
2011-03-28
|
[
[
"Suematsu",
"Daijiro",
""
],
[
"Toma",
"Takashi",
""
]
] |
The existence of an anomalous U(1) symmetry is shown to play a crucial role in the supersymmetric radiative seesaw model for neutrino masses. It explains the smallness of some couplings related to neutrino mass generation in a favorable way in addition to cause the hierarchical structure of Yukawa couplings of quarks and leptons. If it is spontaneously broken to a $Z_2$ subgroup, this $Z_2$ symmetry can make a lifetime of the lightest field with its odd parity extremely long. Thus, the model has an additional dark matter candidate other than the lightest neutralino, which appears in the $R$-parity conserved MSSM. We discuss the nature of dark matter by taking account of its relation to the neutrino mass generation and the lepton flavor violation.
|
1111.4666
|
Soo-hyeon Nam
|
Kang Young Lee and Soo-hyeon Nam
|
CP violating dimuon charge asymmetry in general left-right models
|
9 pages, 4 figures
| null |
10.1103/PhysRevD.85.035001
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The recently measured charge asymmetry of like-sign dimuon events by the D0
collaboration at Tevatron shows the 3.9 \sigma\ deviation from the standard
model prediction. In order to solve this mismatch, we investigate the
right-handed current contributions to $B_s-\bar{B}_s$ and $B_d-\bar{B}_d$
mixings which are the major source of the like-sign dimuon events in $b
\bar{b}$ production in general left-right models without imposing manifest or
pseudo-manifest left-right symmetry. We find the allowed region of new physics
parameters satisfying the current experimental data.
|
[
{
"created": "Sun, 20 Nov 2011 19:15:12 GMT",
"version": "v1"
}
] |
2013-05-30
|
[
[
"Lee",
"Kang Young",
""
],
[
"Nam",
"Soo-hyeon",
""
]
] |
The recently measured charge asymmetry of like-sign dimuon events by the D0 collaboration at Tevatron shows the 3.9 \sigma\ deviation from the standard model prediction. In order to solve this mismatch, we investigate the right-handed current contributions to $B_s-\bar{B}_s$ and $B_d-\bar{B}_d$ mixings which are the major source of the like-sign dimuon events in $b \bar{b}$ production in general left-right models without imposing manifest or pseudo-manifest left-right symmetry. We find the allowed region of new physics parameters satisfying the current experimental data.
|
1004.3449
|
Vladimir Pascalutsa
|
Tim Ledwig, Vladimir Pascalutsa, Marc Vanderhaeghen (Kernphysik, Mainz
U.)
|
A dispersion relation for the pion-mass dependence of hadron properties
|
8 pages, 4 figs
|
Phys.Lett.B690:129-134,2010
|
10.1016/j.physletb.2010.05.023
|
MKPH-T-10-02
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a dispersion relation in the pion-mass squared, which static
quantities (nucleon mass, magnetic moment, etc.) obey under the assumption of
analyticity in the entire complex $m_\pi^2$ plane modulo a cut at negative
$m_\pi^2$ associated with pion production. The relation is verified here in a
number of examples of nucleon and $\Delta$-isobar properties computed in chiral
perturbation theory up to order $p^3$. We outline a method to obtain relations
for other mass-dependencies, and illustrate it on a two-loop example.
|
[
{
"created": "Tue, 20 Apr 2010 13:47:58 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Ledwig",
"Tim",
"",
"Kernphysik, Mainz\n U."
],
[
"Pascalutsa",
"Vladimir",
"",
"Kernphysik, Mainz\n U."
],
[
"Vanderhaeghen",
"Marc",
"",
"Kernphysik, Mainz\n U."
]
] |
We present a dispersion relation in the pion-mass squared, which static quantities (nucleon mass, magnetic moment, etc.) obey under the assumption of analyticity in the entire complex $m_\pi^2$ plane modulo a cut at negative $m_\pi^2$ associated with pion production. The relation is verified here in a number of examples of nucleon and $\Delta$-isobar properties computed in chiral perturbation theory up to order $p^3$. We outline a method to obtain relations for other mass-dependencies, and illustrate it on a two-loop example.
|
hep-ph/9609383
|
Stephane Keller
|
Stephane Keller (Fermilab) and Eric Laenen (CERN)
|
Higher Order QCD Corrections to Tagged Production Processes
|
4 pages, no figure, talk presented by S. Keller at the DPF96
Conference, Minneapolis, MN, August 10-15, 1996, to appear in the Proceedings
| null | null |
CERN-TH/96-230,FERMILAB-CONF-96/306-T
|
hep-ph
| null |
We extend the phase space slicing method to allow for heavy quarks and
fragmentation functions. The method can be used to calculate differential cross
section in which any particular particle (massive or massless) is tagged.
|
[
{
"created": "Tue, 17 Sep 1996 16:43:19 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Keller",
"Stephane",
"",
"Fermilab"
],
[
"Laenen",
"Eric",
"",
"CERN"
]
] |
We extend the phase space slicing method to allow for heavy quarks and fragmentation functions. The method can be used to calculate differential cross section in which any particular particle (massive or massless) is tagged.
|
0905.3430
|
Jiliang Jing
|
Jieci Wang, Qiyuan Pan and Jiliang Jing
|
Projective measurements and generation of entangled Dirac particles in
Schwarzschild Spacetime
|
11 pages, 1 figure; Accepted by Annals of physics
|
Annals Phys.325:1190-1197,2010
|
10.1016/j.aop.2010.03.001
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It is shown that the projective measurements made by Bob who locates near the
event horizon of the Schwarzschild black hole will create entangled particles
detected by Alice who stays stationary at the asymptotically flat region. It is
found that the degree of entanglement decreases as the frequency of the
detected particles increases and approaches to zero as the frequency
$\omega_\mathbf{k} \to\infty$. It is also noted that the degree of entanglement
increases as the Hawking temperature increases. Especially, the particle state
is unentangled when the Hawking temperature is zero and approaches a maximally
entangled Bell state when the black hole evaporates completely.
|
[
{
"created": "Thu, 21 May 2009 03:15:09 GMT",
"version": "v1"
},
{
"created": "Fri, 14 May 2010 03:38:54 GMT",
"version": "v2"
}
] |
2014-11-20
|
[
[
"Wang",
"Jieci",
""
],
[
"Pan",
"Qiyuan",
""
],
[
"Jing",
"Jiliang",
""
]
] |
It is shown that the projective measurements made by Bob who locates near the event horizon of the Schwarzschild black hole will create entangled particles detected by Alice who stays stationary at the asymptotically flat region. It is found that the degree of entanglement decreases as the frequency of the detected particles increases and approaches to zero as the frequency $\omega_\mathbf{k} \to\infty$. It is also noted that the degree of entanglement increases as the Hawking temperature increases. Especially, the particle state is unentangled when the Hawking temperature is zero and approaches a maximally entangled Bell state when the black hole evaporates completely.
|
0912.5423
|
Chia-Min Lin
|
Lu-Yun Lee, Kingman Cheung and Chia-Min Lin
|
Comments on SUSY inflation models on the brane
|
7 pages
|
Mod.Phys.Lett.A25:2105-2110,2010
|
10.1142/S0217732310033487
| null |
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we consider a class of inflation models on the brane where the
dominant part of the inflaton scalar potential does not depend on the inflaton
field value during inflation. In particular, we consider supernatural
inflation, its hilltop version, A-term inflation, and supersymmetric (SUSY) D-
and F-term hybrid inflation on the brane. We show that the parameter space can
be broadened, the inflation scale generally can be lowered, and still possible
to have the spectral index $n_s=0.96$.
|
[
{
"created": "Wed, 30 Dec 2009 07:41:59 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Lee",
"Lu-Yun",
""
],
[
"Cheung",
"Kingman",
""
],
[
"Lin",
"Chia-Min",
""
]
] |
In this paper we consider a class of inflation models on the brane where the dominant part of the inflaton scalar potential does not depend on the inflaton field value during inflation. In particular, we consider supernatural inflation, its hilltop version, A-term inflation, and supersymmetric (SUSY) D- and F-term hybrid inflation on the brane. We show that the parameter space can be broadened, the inflation scale generally can be lowered, and still possible to have the spectral index $n_s=0.96$.
|
1710.00836
|
Shahar Hod
|
Shahar Hod
|
On the number of light rings in curved spacetimes of ultra-compact
objects
|
5 pages
|
Physics Letters B 776, 1 (2018)
| null | null |
gr-qc astro-ph.HE hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In a very interesting paper, Cunha, Berti, and Herdeiro have recently claimed
that ultra-compact objects, self-gravitating horizonless solutions of the
Einstein field equations which have a light ring, must possess at least {\it
two} (and, in general, an even number of) light rings, of which the inner one
is {\it stable}. In the present compact paper we explicitly prove that, while
this intriguing theorem is generally true, there is an important exception in
the presence of degenerate light rings which, in the spherically symmetric
static case, are characterized by the simple dimensionless relation $8\pi
r^2_{\gamma}(\rho+p_{\text{T}})=1$ [here $r_{\gamma}$ is the radius of the
light ring and $\{\rho,p_{\text{T}}\}$ are respectively the energy density and
tangential pressure of the matter fields]. Ultra-compact objects which belong
to this unique family can have an {\it odd} number of light rings. As a
concrete example, we show that spherically symmetric constant density stars
with dimensionless compactness $M/R=1/3$ possess only {\it one} light ring
which, interestingly, is shown to be {\it unstable}.
|
[
{
"created": "Mon, 2 Oct 2017 18:00:08 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Dec 2017 13:18:46 GMT",
"version": "v2"
}
] |
2017-12-07
|
[
[
"Hod",
"Shahar",
""
]
] |
In a very interesting paper, Cunha, Berti, and Herdeiro have recently claimed that ultra-compact objects, self-gravitating horizonless solutions of the Einstein field equations which have a light ring, must possess at least {\it two} (and, in general, an even number of) light rings, of which the inner one is {\it stable}. In the present compact paper we explicitly prove that, while this intriguing theorem is generally true, there is an important exception in the presence of degenerate light rings which, in the spherically symmetric static case, are characterized by the simple dimensionless relation $8\pi r^2_{\gamma}(\rho+p_{\text{T}})=1$ [here $r_{\gamma}$ is the radius of the light ring and $\{\rho,p_{\text{T}}\}$ are respectively the energy density and tangential pressure of the matter fields]. Ultra-compact objects which belong to this unique family can have an {\it odd} number of light rings. As a concrete example, we show that spherically symmetric constant density stars with dimensionless compactness $M/R=1/3$ possess only {\it one} light ring which, interestingly, is shown to be {\it unstable}.
|
hep-ph/9609492
|
Yuri A. Golubkov
|
Yu.A. Golubkov
|
The Modified Intrinsic Charm Model And J/Psi Production in Hadronic
Collisions
|
11 pages, LaTeX, 4 Postscript figures
| null | null |
INP MSU 96-30/437
|
hep-ph
| null |
Using the statistical approach additional light partons have been introduced
in the Intrinsic Charm model. Explicit expressions are obtained for charmed and
light quark distributions. A comparison is made with standard IC model
predictions. It is shown that such a modification of the IC model leads to
better agreement with the $pN$ and $\pi N$ data on $\JP$ production at low
energies and allows to avoid a contradiction to experimental data at high
energy.
|
[
{
"created": "Thu, 26 Sep 1996 12:28:31 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Golubkov",
"Yu. A.",
""
]
] |
Using the statistical approach additional light partons have been introduced in the Intrinsic Charm model. Explicit expressions are obtained for charmed and light quark distributions. A comparison is made with standard IC model predictions. It is shown that such a modification of the IC model leads to better agreement with the $pN$ and $\pi N$ data on $\JP$ production at low energies and allows to avoid a contradiction to experimental data at high energy.
|
gr-qc/0405063
|
Leonardo Gualtieri
|
L.Gualtieri, J.A.Pons, G.Miniutti
|
Non-adiabatic oscillations of compact stars in general relativity
|
22 pages, 4 figures, minor changes to match version accepted by Phys.
Rev. D
|
Phys.Rev. D70 (2004) 084009
|
10.1103/PhysRevD.70.084009
| null |
gr-qc astro-ph
| null |
We have developed a formalism to study non-adiabatic, non-radial oscillations
of non-rotating compact stars in the frequency domain, including the effects of
thermal diffusion in the framework of general relativistic perturbation theory.
When a general equation of state depending on temperature is used, the
perturbations of the fluid result in heat flux which is coupled with the
spacetime geometry through the Einstein field equations. Our results show that
the frequency of the first pressure (p) and gravity (g) oscillation modes is
significantly affected by thermal diffusion, while that of the fundamental (f)
mode is basically unaltered due to the global nature of that oscillation. The
damping time of the oscillations is generally much smaller than in the
adiabatic case (more than two orders of magnitude for the p- and g-modes)
reflecting the effect of thermal dissipation. Both the isothermal and adiabatic
limits are recovered in our treatment and we study in more detail the
intermediate regime. Our formalism finds its natural astrophysical application
in the study of the oscillation properties of newly born neutron stars, neutron
stars with a deconfined quark core phase, or strange stars which are all
promising sources of gravitational waves with frequencies in the band of the
first generation and advanced ground-based interferometric detectors.
|
[
{
"created": "Wed, 12 May 2004 13:19:07 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Sep 2004 19:08:39 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Gualtieri",
"L.",
""
],
[
"Pons",
"J. A.",
""
],
[
"Miniutti",
"G.",
""
]
] |
We have developed a formalism to study non-adiabatic, non-radial oscillations of non-rotating compact stars in the frequency domain, including the effects of thermal diffusion in the framework of general relativistic perturbation theory. When a general equation of state depending on temperature is used, the perturbations of the fluid result in heat flux which is coupled with the spacetime geometry through the Einstein field equations. Our results show that the frequency of the first pressure (p) and gravity (g) oscillation modes is significantly affected by thermal diffusion, while that of the fundamental (f) mode is basically unaltered due to the global nature of that oscillation. The damping time of the oscillations is generally much smaller than in the adiabatic case (more than two orders of magnitude for the p- and g-modes) reflecting the effect of thermal dissipation. Both the isothermal and adiabatic limits are recovered in our treatment and we study in more detail the intermediate regime. Our formalism finds its natural astrophysical application in the study of the oscillation properties of newly born neutron stars, neutron stars with a deconfined quark core phase, or strange stars which are all promising sources of gravitational waves with frequencies in the band of the first generation and advanced ground-based interferometric detectors.
|
1904.06727
|
Kirill Bronnikov
|
S.V. Bolokhov, K.A. Bronnikov and M.V. Skvortsova
|
Rotating cylinders with anisotropic fluids in general relativity
|
10 two-column pages
|
Grav. Cosmol. 25, 122-130 (2019)
|
10.1134/S020228931902004X
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider anisotropic fluids with directional pressures $p_i = w_i \rho$
($\rho$ is the density, $w_i = $const, $i = 1,2,3$) as sources of gravity in
stationary cylindrically symmetric space-times. We describe a general way of
obtaining exact solutions with such sources, where the main features are
splitting of the Ricci tensor into static and rotational parts and using the
harmonic radial coordinate. Depending on the values of $w_i$, it appears
possible to obtain general or special solutions to the Einstein equations, thus
recovering some known solutions and finding new ones. Three particular examples
of exact solutions are briefly described: with a stiff isotropic perfect fluid
($p = \rho$), with a distribution of cosmic strings of azimuthal direction
(i.e., forming circles around the $z$ axis), and with a stationary combination
of two opposite radiation flows along the $z$ axis.
|
[
{
"created": "Sun, 14 Apr 2019 17:13:02 GMT",
"version": "v1"
}
] |
2019-06-19
|
[
[
"Bolokhov",
"S. V.",
""
],
[
"Bronnikov",
"K. A.",
""
],
[
"Skvortsova",
"M. V.",
""
]
] |
We consider anisotropic fluids with directional pressures $p_i = w_i \rho$ ($\rho$ is the density, $w_i = $const, $i = 1,2,3$) as sources of gravity in stationary cylindrically symmetric space-times. We describe a general way of obtaining exact solutions with such sources, where the main features are splitting of the Ricci tensor into static and rotational parts and using the harmonic radial coordinate. Depending on the values of $w_i$, it appears possible to obtain general or special solutions to the Einstein equations, thus recovering some known solutions and finding new ones. Three particular examples of exact solutions are briefly described: with a stiff isotropic perfect fluid ($p = \rho$), with a distribution of cosmic strings of azimuthal direction (i.e., forming circles around the $z$ axis), and with a stationary combination of two opposite radiation flows along the $z$ axis.
|
hep-ph/9409236
|
PostDoc Its
|
Xiao-Gang He and S. Pakvasa
|
CP Violation In Hyperon Decays
|
11 pages, Revtex. Talk presented by Xiao-Gang He at the Eighth
Meeting of the American Physical Society, Division of Particles and Fields
(DPF'94), Albuqurque, New Mexico, August 2-6, 1994
| null | null |
UH-511-802-94, OITS-550
|
hep-ph
| null |
The present status for CP violation in hyperon decays is reviewed.
|
[
{
"created": "Tue, 6 Sep 1994 17:58:17 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"He",
"Xiao-Gang",
""
],
[
"Pakvasa",
"S.",
""
]
] |
The present status for CP violation in hyperon decays is reviewed.
|
1502.06158
|
Samoil Bilenky M.
|
S. M. Bilenky
|
Some comments on high precision study of neutrino oscillations
| null | null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I discuss some problems connected with the high precision study of neutrino
oscillations. In the general case of $n$-neutrino mixing I derive a convenient
expression for transition probability in which only independent terms (and
mass-squared differences) enter. For three-neutrino mixing I discuss a problem
of a definition of a large (atmospheric) neutrino mass-squared difference. I
comment also possibilities to reveal the character of neutrino mass spectrum in
future reactor neutrino experiments.
|
[
{
"created": "Sun, 22 Feb 2015 00:51:04 GMT",
"version": "v1"
}
] |
2015-02-24
|
[
[
"Bilenky",
"S. M.",
""
]
] |
I discuss some problems connected with the high precision study of neutrino oscillations. In the general case of $n$-neutrino mixing I derive a convenient expression for transition probability in which only independent terms (and mass-squared differences) enter. For three-neutrino mixing I discuss a problem of a definition of a large (atmospheric) neutrino mass-squared difference. I comment also possibilities to reveal the character of neutrino mass spectrum in future reactor neutrino experiments.
|
1106.2609
|
Alexander Knochel
|
Alexander Knochel, Christof Wetterich
|
Theoretical constraints on new generations with and without Quarks or
Neutrinos
| null | null |
10.1016/j.physletb.2011.09.004
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider large classes of chiral extensions of the Standard Model,
including new quark generations that do not involve additional neutrinos as
well as lepton generations without quarks. An analysis of renormalization flows
of Yukawa and quartic scalar couplings reveals that additional quarks are not
compatible with a scenario of grand unification without violating the strong
bounds from direct and Higgs searches at colliders. Constraints from direct
searches, electroweak precision observables, and Higgs physics, together with
the assumption that additional new physics beyond the extended chiral field
content should enter significantly above the TeV scale, allows us to make
predictions for searches at the LHC.
|
[
{
"created": "Tue, 14 Jun 2011 04:45:57 GMT",
"version": "v1"
}
] |
2015-05-28
|
[
[
"Knochel",
"Alexander",
""
],
[
"Wetterich",
"Christof",
""
]
] |
We consider large classes of chiral extensions of the Standard Model, including new quark generations that do not involve additional neutrinos as well as lepton generations without quarks. An analysis of renormalization flows of Yukawa and quartic scalar couplings reveals that additional quarks are not compatible with a scenario of grand unification without violating the strong bounds from direct and Higgs searches at colliders. Constraints from direct searches, electroweak precision observables, and Higgs physics, together with the assumption that additional new physics beyond the extended chiral field content should enter significantly above the TeV scale, allows us to make predictions for searches at the LHC.
|
2202.00996
|
Daniel Locke
|
Alexander Belyaev, Giacomo Cacciapaglia, Daniel Locke
|
Minimal Consistent models for systematic Dark Matter exploration
|
10 pages, 3 figures, contribution to 55th Rencontres de Moriond on
QCD and High Energy Interactions (Moriond QCD 2021)(C21-03-27), March
27-April 3, 2021
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Dark Matter searches in collider and non-collider experiments requires
systematic and consistent approach. We suggest and perform classification of
Minimal Consistent Dark Matter models which are aimed to create a solid
framework for Dark Matter exploration.
|
[
{
"created": "Wed, 2 Feb 2022 12:30:56 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Feb 2022 09:45:06 GMT",
"version": "v2"
}
] |
2022-02-04
|
[
[
"Belyaev",
"Alexander",
""
],
[
"Cacciapaglia",
"Giacomo",
""
],
[
"Locke",
"Daniel",
""
]
] |
Dark Matter searches in collider and non-collider experiments requires systematic and consistent approach. We suggest and perform classification of Minimal Consistent Dark Matter models which are aimed to create a solid framework for Dark Matter exploration.
|
hep-ph/0012236
|
Carlo Giunti
|
C. Giunti
|
Four-Neutrino Scenarios
|
7 pages. Talk presented at NOW 2000, Conca Specchiulla (Otranto,
Italy), 9-16 Sep. 2000
|
Nucl.Phys.Proc.Suppl.100:244-249,2001
|
10.1016/S0920-5632(01)01448-7
|
DFTT 47/00
|
hep-ph hep-ex
| null |
The main features of four-neutrino 3+1 and 2+2 mixing schemes are reviewed,
after a discussion on the necessity of at least four massive neutrinos if the
solar, atmospheric and LSND anomalies are due to neutrino oscillations.
Complete list of references on four-neutrino mixing at
http://www.to.infn.it/~giunti/neutrino
|
[
{
"created": "Mon, 18 Dec 2000 18:50:44 GMT",
"version": "v1"
}
] |
2011-07-19
|
[
[
"Giunti",
"C.",
""
]
] |
The main features of four-neutrino 3+1 and 2+2 mixing schemes are reviewed, after a discussion on the necessity of at least four massive neutrinos if the solar, atmospheric and LSND anomalies are due to neutrino oscillations. Complete list of references on four-neutrino mixing at http://www.to.infn.it/~giunti/neutrino
|
1907.02740
|
Arnab Dasgupta
|
Debasish Borah, Arnab Dasgupta, Ujjal Kumar Dey, Gaurav Tomar
|
Connecting ANITA Anomalous Events to a Non-thermal Dark Matter Scenario
|
21 pages, 6 figures, accepted for publication in Physical Review D
|
Phys. Rev. D 101, 075039 (2020)
|
10.1103/PhysRevD.101.075039
| null |
hep-ph astro-ph.CO astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The ANtarctic Impulsive Transient Antenna (ANITA) collaboration has observed
two EeV-energy, upward going events originating from below the horizon. As no
standard model (SM) particles, propagating through the earth at such energy and
exit angles, can give rise to the required survival probability for the
observed events, several beyond standard model (BSM) proposals have come up. We
propose a scenario where a $Z_2$ odd sector is responsible for such anomalous
events. The next to lightest $Z_2$ odd particle or the next to lightest stable
particle (NLSP), created from ultra high energy neutrino interactions with
nucleons, can pass through the earth and then decay into the lightest $Z_2$ odd
particle or the lightest stable particle (LSP) and a tau lepton. The long-lived
nature of the NLSP requires its coupling with the LSP to be very small, keeping
the LSP out of thermal equilibrium in the early universe. The LSP can then be a
non-thermal dark matter while the tau leptons produced from NLSP decay after
passing through the earth can explain the ANITA events. We first show that a
purely non-thermal dark matter scenario can not give rise to the required event
rates while a hybrid scenario where dark matter can have both thermal as a well
non-thermal contribution to its relic abundance, serves the purpose.
|
[
{
"created": "Fri, 5 Jul 2019 09:32:03 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Apr 2020 03:42:09 GMT",
"version": "v2"
}
] |
2020-04-29
|
[
[
"Borah",
"Debasish",
""
],
[
"Dasgupta",
"Arnab",
""
],
[
"Dey",
"Ujjal Kumar",
""
],
[
"Tomar",
"Gaurav",
""
]
] |
The ANtarctic Impulsive Transient Antenna (ANITA) collaboration has observed two EeV-energy, upward going events originating from below the horizon. As no standard model (SM) particles, propagating through the earth at such energy and exit angles, can give rise to the required survival probability for the observed events, several beyond standard model (BSM) proposals have come up. We propose a scenario where a $Z_2$ odd sector is responsible for such anomalous events. The next to lightest $Z_2$ odd particle or the next to lightest stable particle (NLSP), created from ultra high energy neutrino interactions with nucleons, can pass through the earth and then decay into the lightest $Z_2$ odd particle or the lightest stable particle (LSP) and a tau lepton. The long-lived nature of the NLSP requires its coupling with the LSP to be very small, keeping the LSP out of thermal equilibrium in the early universe. The LSP can then be a non-thermal dark matter while the tau leptons produced from NLSP decay after passing through the earth can explain the ANITA events. We first show that a purely non-thermal dark matter scenario can not give rise to the required event rates while a hybrid scenario where dark matter can have both thermal as a well non-thermal contribution to its relic abundance, serves the purpose.
|
1111.0857
|
Takayuki Matsuki
|
Takayuki Matsuki and Koichi Seo
|
Chiral Particle Decay of Heavy-Light Mesons in a Relativistic Potential
Model
|
14pages, 6tables
|
PhysRevD 85, 014036 (2012)
|
10.1103/PhysRevD.85.014036
| null |
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Partial decay widths of the heavy-light mesons, $D, D_s, B,$ and $B_s$,
emitting one chiral particle ($\pi$ or $K$) are evaluated in the framework of a
relativistic potential model. Decay amplitudes are calculated by keeping the
Lorentz invariance as far as possible and use has been made of the
Lorentz-boosted relativistic wave functions of the heavy-light mesons. One of
predictions of our calculation is very narrow widths of a few keV for yet
undsicovered $B_s(0^+, 1^+)$ mesons corresponding to ${^{2S+1}L_J}={^3P_0}$ and
$"{^3P_1}"$ assuming their masses to be 5617 and 5682 MeV, respectively, as
calculated in our former paper. In the course of our calculation, new sum rules
are discovered on the decay widths in the limit of $m_Q\to \infty$. Among these
rules, $ \Gamma(D_{s0}^*(2317)\to D_s+\pi)=\Gamma (D_{s1}(2460)\to D_s^*+\pi) $
and $ \Gamma(B_{s0}^*(5615)\to B_s+\pi)=\Gamma (B_{s1}(5679)\to B_s^*+\pi) $
are predicted to hold with a good accuracy.
|
[
{
"created": "Thu, 3 Nov 2011 14:43:14 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Dec 2011 03:08:45 GMT",
"version": "v2"
}
] |
2012-02-16
|
[
[
"Matsuki",
"Takayuki",
""
],
[
"Seo",
"Koichi",
""
]
] |
Partial decay widths of the heavy-light mesons, $D, D_s, B,$ and $B_s$, emitting one chiral particle ($\pi$ or $K$) are evaluated in the framework of a relativistic potential model. Decay amplitudes are calculated by keeping the Lorentz invariance as far as possible and use has been made of the Lorentz-boosted relativistic wave functions of the heavy-light mesons. One of predictions of our calculation is very narrow widths of a few keV for yet undsicovered $B_s(0^+, 1^+)$ mesons corresponding to ${^{2S+1}L_J}={^3P_0}$ and $"{^3P_1}"$ assuming their masses to be 5617 and 5682 MeV, respectively, as calculated in our former paper. In the course of our calculation, new sum rules are discovered on the decay widths in the limit of $m_Q\to \infty$. Among these rules, $ \Gamma(D_{s0}^*(2317)\to D_s+\pi)=\Gamma (D_{s1}(2460)\to D_s^*+\pi) $ and $ \Gamma(B_{s0}^*(5615)\to B_s+\pi)=\Gamma (B_{s1}(5679)\to B_s^*+\pi) $ are predicted to hold with a good accuracy.
|
1909.08414
|
Branislav Cvetkovi\'c
|
Branislav Cvetkovi\'c and Dejan Simi\'c
|
Velocity memory effect without soft particles
|
LaTeX, 10 pages, 10 figures; v2, revised version, presentation
improved, 11 pages, 10 figures
|
Phys. Rev. D 101, 024006 (2020)
|
10.1103/PhysRevD.101.024006
| null |
gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the behavior of geodesics in the plane-fronted wave background of
the three-dimensional (3D) gravity with propagating torsion, which possesses
only massive degrees of freedom. We discover the velocity memory effect, in
contrast to the current belief that its existence is due to the presence of
soft particles.
|
[
{
"created": "Wed, 18 Sep 2019 12:54:33 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Mar 2020 22:15:57 GMT",
"version": "v2"
}
] |
2020-03-19
|
[
[
"Cvetković",
"Branislav",
""
],
[
"Simić",
"Dejan",
""
]
] |
We study the behavior of geodesics in the plane-fronted wave background of the three-dimensional (3D) gravity with propagating torsion, which possesses only massive degrees of freedom. We discover the velocity memory effect, in contrast to the current belief that its existence is due to the presence of soft particles.
|
2112.15144
|
Kyle Shiells PhD
|
Kyle Shiells, Yuxun Guo, Xiangdong Ji
|
On Extraction of Twist-Two Compton Form Factors from DVCS Observables
Through Harmonic Analysis
|
52 pages, 8 figures, 5 tables
| null |
10.1007/JHEP08(2022)048
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the exercise of locally extracting the real and imaginary
parts of the four twist-2 Compton form factors (CFFs)
$\{\mathcal{H},\mathcal{E},\widetilde{\mathcal{H}},\widetilde{\mathcal{E}}\}$
which arise in the deeply virtual Compton scattering (DVCS) process $e + p
\rightarrow e + p + \gamma$. Neglecting dynamical higher-twist contributions,
we find that there are a sufficient number of DVCS observables and degrees of
freedom to extract all 8 leading quantities model-independently, exploiting the
azimuthal dependence of the absolute cross sections across all possible beam
and target polarizations at a common kinematical point in $\{Q,t,x_B,y\}$. As
an example, for typical JLab lab-frame kinematics, we simplify the reduced DVCS
observables to their dominant terms, providing a sufficient number of equations
for local determination of the twist-2 CFFs. We demonstrate the feasibility
using harmonic fitting to both cross sections and beam spin asymmetries with
both real and pseudo-data.
|
[
{
"created": "Thu, 30 Dec 2021 17:45:07 GMT",
"version": "v1"
}
] |
2022-08-24
|
[
[
"Shiells",
"Kyle",
""
],
[
"Guo",
"Yuxun",
""
],
[
"Ji",
"Xiangdong",
""
]
] |
We investigate the exercise of locally extracting the real and imaginary parts of the four twist-2 Compton form factors (CFFs) $\{\mathcal{H},\mathcal{E},\widetilde{\mathcal{H}},\widetilde{\mathcal{E}}\}$ which arise in the deeply virtual Compton scattering (DVCS) process $e + p \rightarrow e + p + \gamma$. Neglecting dynamical higher-twist contributions, we find that there are a sufficient number of DVCS observables and degrees of freedom to extract all 8 leading quantities model-independently, exploiting the azimuthal dependence of the absolute cross sections across all possible beam and target polarizations at a common kinematical point in $\{Q,t,x_B,y\}$. As an example, for typical JLab lab-frame kinematics, we simplify the reduced DVCS observables to their dominant terms, providing a sufficient number of equations for local determination of the twist-2 CFFs. We demonstrate the feasibility using harmonic fitting to both cross sections and beam spin asymmetries with both real and pseudo-data.
|
1803.02350
|
Hao Liu
|
James Creswell, Hao Liu, Andrew D. Jackson, Sebastian von Hausegger,
Pavel Naselsky
|
Degeneracy of gravitational waveforms in the context of GW150914
|
Accepted for publication in JCAP
|
JCAP03(2018)007
|
10.1088/1475-7516/2018/03/007
| null |
gr-qc astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the degeneracy of theoretical gravitational waveforms for binary
black hole mergers using an aligned-spin effective-one-body model. After
appropriate truncation, bandpassing, and matching, we identify regions in the
mass--spin parameter space containing waveforms similar to the template
proposed for GW150914, with masses $m_1 = 36^{+5}_{-4} M_\odot$ and $m_2 =
29^{+4}_{-4} M_\odot$, using the cross-correlation coefficient as a measure of
the similarity between waveforms. Remarkably high cross-correlations are found
across broad regions of parameter space. The associated uncertanties exceed
these from LIGO's Bayesian analysis considerably. We have shown that waveforms
with greatly increased masses, such as $m_1 = 70 M_\odot$ and $m_2 = 35
M_\odot$, and strong anti-aligned spins ($\chi_1=0.95$ and $\chi_2=-0.95$)
yield almost the same signal-to-noise ratio in the strain data for GW150914.
|
[
{
"created": "Tue, 6 Mar 2018 08:05:49 GMT",
"version": "v1"
}
] |
2018-03-21
|
[
[
"Creswell",
"James",
""
],
[
"Liu",
"Hao",
""
],
[
"Jackson",
"Andrew D.",
""
],
[
"von Hausegger",
"Sebastian",
""
],
[
"Naselsky",
"Pavel",
""
]
] |
We study the degeneracy of theoretical gravitational waveforms for binary black hole mergers using an aligned-spin effective-one-body model. After appropriate truncation, bandpassing, and matching, we identify regions in the mass--spin parameter space containing waveforms similar to the template proposed for GW150914, with masses $m_1 = 36^{+5}_{-4} M_\odot$ and $m_2 = 29^{+4}_{-4} M_\odot$, using the cross-correlation coefficient as a measure of the similarity between waveforms. Remarkably high cross-correlations are found across broad regions of parameter space. The associated uncertanties exceed these from LIGO's Bayesian analysis considerably. We have shown that waveforms with greatly increased masses, such as $m_1 = 70 M_\odot$ and $m_2 = 35 M_\odot$, and strong anti-aligned spins ($\chi_1=0.95$ and $\chi_2=-0.95$) yield almost the same signal-to-noise ratio in the strain data for GW150914.
|
0710.3525
|
Shaaban Khalil
|
S. Khalil and A. Masiero
|
Radiative B-L symmetry breaking in supersymmetric models
|
4 pages
|
Phys.Lett.B665:374-377,2008
|
10.1016/j.physletb.2008.06.063
| null |
hep-ph
| null |
We propose a scheme where the three relevant physics scales related to the
supersymmetry, electroweak, and baryon minus lepton (B-L) breakings are linked
together and occur at the TeV scale. The phenomenological implications in the
Higgs and leptonic sectors are discussed.
|
[
{
"created": "Thu, 18 Oct 2007 14:42:40 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Khalil",
"S.",
""
],
[
"Masiero",
"A.",
""
]
] |
We propose a scheme where the three relevant physics scales related to the supersymmetry, electroweak, and baryon minus lepton (B-L) breakings are linked together and occur at the TeV scale. The phenomenological implications in the Higgs and leptonic sectors are discussed.
|
hep-ph/9810475
|
Patricia Ball
|
Patricia Ball and V.M. Braun
|
Higher Twist Distribution Amplitudes of Vector Mesons in QCD: Twist-4
Distributions and Meson Mass Corrections
|
38 pages Latex, 2 postscript figures
|
Nucl.Phys. B543 (1999) 201-238
|
10.1016/S0550-3213(99)00014-0
|
CERN-TH/98-333
|
hep-ph
| null |
We present a systematic study of twist-4 light-cone distribution amplitudes
of vector mesons in QCD, which is based on conformal expansion. The structure
of meson mass corrections is studied in detail. A complete set of distribution
amplitudes is constructed, which satisfies all (exact) equations of motion and
constraints from conformal expansion. Nonperturbative input parameters are
estimated from QCD sum rules. Our study suggests that meson mass corrections
may present a dominant source of higher twist effects in exclusive processes.
|
[
{
"created": "Mon, 26 Oct 1998 09:22:28 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Ball",
"Patricia",
""
],
[
"Braun",
"V. M.",
""
]
] |
We present a systematic study of twist-4 light-cone distribution amplitudes of vector mesons in QCD, which is based on conformal expansion. The structure of meson mass corrections is studied in detail. A complete set of distribution amplitudes is constructed, which satisfies all (exact) equations of motion and constraints from conformal expansion. Nonperturbative input parameters are estimated from QCD sum rules. Our study suggests that meson mass corrections may present a dominant source of higher twist effects in exclusive processes.
|
1108.4686
|
Daniel Grumiller
|
S. Carlip and D. Grumiller
|
Lower bound on the spectral dimension near a black hole
|
6 pp, 2 eps figs
|
Phys.Rev. D84 (2011) 084029
|
10.1103/PhysRevD.84.084029
|
TUW-11-21
|
gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider an evaporating Schwarzschild black hole in a framework in which
the spectral dimension of spacetime varies continuously from four at large
distances to a number smaller than three at small distances, as suggested by
various approaches to quantum gravity. We demonstrate that the evaporation
stops when the horizon radius reaches a scale at which spacetime becomes
effectively 3-dimensional, and argue that an observer remaining outside the
horizon cannot probe the properties of the black hole at smaller scales. This
result is universal in the sense that it does not depend on the details of the
effective dimension as a function of the diffusion time. Observers falling into
the black hole can resolve smaller scales, as can external observers in the
presence of a cosmological constant. Even in these cases, though, we obtain an
absolute bound D>2 on the effective dimension that can be seen in any such
attempt to measure the properties of the black hole.
|
[
{
"created": "Tue, 23 Aug 2011 20:00:01 GMT",
"version": "v1"
}
] |
2013-06-18
|
[
[
"Carlip",
"S.",
""
],
[
"Grumiller",
"D.",
""
]
] |
We consider an evaporating Schwarzschild black hole in a framework in which the spectral dimension of spacetime varies continuously from four at large distances to a number smaller than three at small distances, as suggested by various approaches to quantum gravity. We demonstrate that the evaporation stops when the horizon radius reaches a scale at which spacetime becomes effectively 3-dimensional, and argue that an observer remaining outside the horizon cannot probe the properties of the black hole at smaller scales. This result is universal in the sense that it does not depend on the details of the effective dimension as a function of the diffusion time. Observers falling into the black hole can resolve smaller scales, as can external observers in the presence of a cosmological constant. Even in these cases, though, we obtain an absolute bound D>2 on the effective dimension that can be seen in any such attempt to measure the properties of the black hole.
|
2407.06251
|
Yago Porto
|
Sudip Jana, Yago Porto
|
Non-Standard Interactions of Supernova Neutrinos and Mass Ordering
Ambiguity at DUNE
|
7 pages + references, 6 figures
| null | null | null |
hep-ph astro-ph.HE astro-ph.SR hep-ex hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We show that non-standard neutrino interactions (NSI) can notably modify the
pattern of resonant flavor conversion of neutrinos within supernovae and
significantly impact the neutronization burst signal in forthcoming experiments
such as the Deep Underground Neutrino Experiment (DUNE). The presence of NSI
can invert the energy levels of neutrino matter eigenstates and even induce a
new resonance in the inner parts close to the proto-neutron star. We
demonstrate how DUNE can use these new configurations of energy levels to have
sensitivity to NSIs down to $\mathcal{O}(0.1)$. We also elucidate how the
effect may result in a puzzling confusion of normal and inverted mass orderings
by highlighting the emergence or vanishing of the neutronization peak, which
distinguishes between the two mass orderings. Potential implications are
analyzed thoroughly.
|
[
{
"created": "Mon, 8 Jul 2024 18:00:00 GMT",
"version": "v1"
}
] |
2024-07-10
|
[
[
"Jana",
"Sudip",
""
],
[
"Porto",
"Yago",
""
]
] |
We show that non-standard neutrino interactions (NSI) can notably modify the pattern of resonant flavor conversion of neutrinos within supernovae and significantly impact the neutronization burst signal in forthcoming experiments such as the Deep Underground Neutrino Experiment (DUNE). The presence of NSI can invert the energy levels of neutrino matter eigenstates and even induce a new resonance in the inner parts close to the proto-neutron star. We demonstrate how DUNE can use these new configurations of energy levels to have sensitivity to NSIs down to $\mathcal{O}(0.1)$. We also elucidate how the effect may result in a puzzling confusion of normal and inverted mass orderings by highlighting the emergence or vanishing of the neutronization peak, which distinguishes between the two mass orderings. Potential implications are analyzed thoroughly.
|
gr-qc/9312003
|
Piotr Koc
|
Janusz Karkowski, Piotr Koc, Zdobyslaw Swierczynski
|
Penrose Inequality for Gravitational Waves
|
5 pages, emTeX Version 3.0 [3a]. Submited to Class. and Quantum Grav
|
Class.Quant.Grav.11:1535-1538,1994
|
10.1088/0264-9381/11/6/017
| null |
gr-qc
| null |
We investigate axially symmetric asymptotically flat vacuum self-gravitating
system. A class of initial data with apparent horizon was numerically
constructed. The examined solutions satisfy the Penrose inequality. The prior
analysis of a massive system and the present results suggest that either
massive or sourcefree configurations fulfill the Penrose inequality.
|
[
{
"created": "Thu, 2 Dec 1993 10:55:09 GMT",
"version": "v1"
}
] |
2010-04-06
|
[
[
"Karkowski",
"Janusz",
""
],
[
"Koc",
"Piotr",
""
],
[
"Swierczynski",
"Zdobyslaw",
""
]
] |
We investigate axially symmetric asymptotically flat vacuum self-gravitating system. A class of initial data with apparent horizon was numerically constructed. The examined solutions satisfy the Penrose inequality. The prior analysis of a massive system and the present results suggest that either massive or sourcefree configurations fulfill the Penrose inequality.
|
1411.0669
|
Adam Falkowski
|
Adam Falkowski and Francesco Riva
|
Model-independent precision constraints on dimension-6 operators
|
21 pages; v2: references added, typos corrected (one in Eq.22); v3:
more references and comments added, more typos corrected, SM predictions in
Table 1 corrected, version accepted in JHEP
| null |
10.1007/JHEP02(2015)039
|
LPT Orsay 14-77
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss electroweak precision constraints on dimension-6 operators in the
effective theory beyond the standard model. We identify the combinations of
these operators that are constrained by the pole observables (the W and Z
masses and on-shell decays) and by the W boson pair production. To this end, we
define a set of effective couplings of W and Z bosons to fermions and to
itself, which capture the effects of new physics corrections. This formalism
clarifies which operators are constrained by which observable, independently of
the adopted basis of operators. We obtain numerical constraints on the
coefficients of dimension-6 operator in a form that can be easily adapted to
any particular basis of operators, or any particular model with new heavy
particles.
|
[
{
"created": "Mon, 3 Nov 2014 21:00:04 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Nov 2014 20:30:30 GMT",
"version": "v2"
},
{
"created": "Thu, 5 Feb 2015 18:10:43 GMT",
"version": "v3"
}
] |
2015-06-23
|
[
[
"Falkowski",
"Adam",
""
],
[
"Riva",
"Francesco",
""
]
] |
We discuss electroweak precision constraints on dimension-6 operators in the effective theory beyond the standard model. We identify the combinations of these operators that are constrained by the pole observables (the W and Z masses and on-shell decays) and by the W boson pair production. To this end, we define a set of effective couplings of W and Z bosons to fermions and to itself, which capture the effects of new physics corrections. This formalism clarifies which operators are constrained by which observable, independently of the adopted basis of operators. We obtain numerical constraints on the coefficients of dimension-6 operator in a form that can be easily adapted to any particular basis of operators, or any particular model with new heavy particles.
|
1508.04100
|
Ali \"Ovg\"un
|
A. \"Ovg\"un
|
Entangled Particles Tunneling From a Schwarzschild Black Hole immersed
in an Electromagnetic Universe with GUP
|
8 pages, 1 figure , minor corrections (The erroneous metric in eq.
(15) of ref.([45]) is corrected here), corrected typos
|
Int J Theor Phys (2016) 55:2919-2927
|
10.1007/s10773-016-2923-0
| null |
gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Quantum gravity has exciting peculiarities on the Planck scale.The effect of
generalized uncertainty principle (GUP) to the entangled scalar/fermion
particles' tunneling from a Schwarzschild black hole immersed in an
electromagnetic Universe is investigated by the help of semi-classical
tunneling method. The quantum corrected Hawking temperature of this black hole
with an external parameter "a" modifies the Hawking temperature for the
entangled particles.
|
[
{
"created": "Mon, 17 Aug 2015 18:11:03 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Dec 2015 17:55:09 GMT",
"version": "v2"
}
] |
2016-05-11
|
[
[
"Övgün",
"A.",
""
]
] |
Quantum gravity has exciting peculiarities on the Planck scale.The effect of generalized uncertainty principle (GUP) to the entangled scalar/fermion particles' tunneling from a Schwarzschild black hole immersed in an electromagnetic Universe is investigated by the help of semi-classical tunneling method. The quantum corrected Hawking temperature of this black hole with an external parameter "a" modifies the Hawking temperature for the entangled particles.
|
1504.00333
|
Andre Fuzfa
|
A. F\"uzfa
|
How current loops and solenoids curve space-time
|
12 pages, 8 figures, accepted for publication in PRD
|
Phys. Rev. D 93, 024014 (2016)
|
10.1103/PhysRevD.93.024014
| null |
gr-qc cond-mat.supr-con hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The curved space-time around current loops and solenoids carrying arbitrarily
large steady electric currents is obtained from the numerical resolution of the
coupled Einstein-Maxwell equations in cylindrical symmetry. The artificial
gravitational field associated to the generation of a magnetic field produces
gravitational redshift of photons and deviation of light. Null geodesics in the
curved space-time of current loops and solenoids are also presented. We finally
propose an experimental setup, achievable with current technology of
superconducting coils, that produces a phase shift of light of the same order
of magnitude than astrophysical signals in ground-based gravitational wave
observatories.
|
[
{
"created": "Wed, 1 Apr 2015 18:39:23 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Nov 2015 09:23:21 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Dec 2015 11:23:35 GMT",
"version": "v3"
}
] |
2016-01-19
|
[
[
"Füzfa",
"A.",
""
]
] |
The curved space-time around current loops and solenoids carrying arbitrarily large steady electric currents is obtained from the numerical resolution of the coupled Einstein-Maxwell equations in cylindrical symmetry. The artificial gravitational field associated to the generation of a magnetic field produces gravitational redshift of photons and deviation of light. Null geodesics in the curved space-time of current loops and solenoids are also presented. We finally propose an experimental setup, achievable with current technology of superconducting coils, that produces a phase shift of light of the same order of magnitude than astrophysical signals in ground-based gravitational wave observatories.
|
1603.04859
|
Francesco D'Eramo
|
Francesco D'Eramo, Kevin Hambleton, Stefano Profumo, Tim Stefaniak
|
Dark Matter Inelastic Up-Scattering with the Interstellar Plasma: An
Exciting New Source of X-Ray Lines, including at 3.5 keV
|
16 pages, 9 figures; v2, version published in Physical Review D
|
Phys. Rev. D 93, 103011 (2016)
|
10.1103/PhysRevD.93.103011
|
SCIPP 16/04
|
hep-ph astro-ph.CO astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore the phenomenology of a class of models where the dark matter
particle can inelastically up-scatter to a heavier excited state via
off-diagonal dipolar interactions with the interstellar plasma (gas or free
electrons). The heavier particle then rapidly decays back to the dark matter
particle plus a quasi-monochromatic photon. For the process to occur at
appreciable rates, the mass splitting between the heavier state and the dark
matter must be comparable to, or smaller than, the kinetic energy of particles
in the plasma. As a result, the predicted photon line falls in the soft X-ray
range, or, potentially, at arbitrarily lower energies. We explore experimental
constraints from cosmology and particle physics, and present accurate
calculations of the dark matter thermal relic density and of the flux of
monochromatic X-rays from thermal plasma excitation. We find that the model
provides a natural explanation for the observed 3.5 keV line from clusters of
galaxies and from the Galactic center, and is consistent with null detections
of the line from dwarf galaxies. The unique line shape, which will be resolved
by future observations with the Hitomi (formerly Astro-H) satellite, and the
predicted unique morphology and target-temperature dependence will enable easy
discrimination of this class of models versus other scenarios for the
generation of the 3.5 keV line or of any other unidentified line across the
electromagnetic spectrum.
|
[
{
"created": "Tue, 15 Mar 2016 20:00:05 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jun 2016 01:55:01 GMT",
"version": "v2"
}
] |
2016-06-08
|
[
[
"D'Eramo",
"Francesco",
""
],
[
"Hambleton",
"Kevin",
""
],
[
"Profumo",
"Stefano",
""
],
[
"Stefaniak",
"Tim",
""
]
] |
We explore the phenomenology of a class of models where the dark matter particle can inelastically up-scatter to a heavier excited state via off-diagonal dipolar interactions with the interstellar plasma (gas or free electrons). The heavier particle then rapidly decays back to the dark matter particle plus a quasi-monochromatic photon. For the process to occur at appreciable rates, the mass splitting between the heavier state and the dark matter must be comparable to, or smaller than, the kinetic energy of particles in the plasma. As a result, the predicted photon line falls in the soft X-ray range, or, potentially, at arbitrarily lower energies. We explore experimental constraints from cosmology and particle physics, and present accurate calculations of the dark matter thermal relic density and of the flux of monochromatic X-rays from thermal plasma excitation. We find that the model provides a natural explanation for the observed 3.5 keV line from clusters of galaxies and from the Galactic center, and is consistent with null detections of the line from dwarf galaxies. The unique line shape, which will be resolved by future observations with the Hitomi (formerly Astro-H) satellite, and the predicted unique morphology and target-temperature dependence will enable easy discrimination of this class of models versus other scenarios for the generation of the 3.5 keV line or of any other unidentified line across the electromagnetic spectrum.
|
hep-ph/0410088
|
Francois Arleo
|
Francois Arleo, Patrick Aurenche, Zouina Belghobsi, Jean-Philippe
Guillet
|
Photon tagged correlations in heavy ion collisions
|
32 pages, 19 figures. Minor changes, published version
|
JHEP 0411:009,2004
|
10.1088/1126-6708/2004/11/009
|
LPTHE-04-24, LAPTH-1071/04
|
hep-ph
| null |
A detailed study of various two-particle correlation functions involving
photons and neutral pions is presented in proton-proton and lead-lead
collisions at the LHC energy. The aim is to use these correlation functions to
quantify the effect of the medium (in lead-lead collisions) on the jet decay
properties. The calculations are carried out at the leading order in QCD but
the next-to-leading order corrections are also discussed. The competition
between different production mechanisms makes the connection between the jet
energy loss spectrum and the gamma-pi correlations somewhat indirect while the
gamma-gamma correlations have a clearer relation to the jet fragmentation
properties.
|
[
{
"created": "Wed, 6 Oct 2004 14:39:53 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Nov 2004 12:03:48 GMT",
"version": "v2"
}
] |
2010-02-03
|
[
[
"Arleo",
"Francois",
""
],
[
"Aurenche",
"Patrick",
""
],
[
"Belghobsi",
"Zouina",
""
],
[
"Guillet",
"Jean-Philippe",
""
]
] |
A detailed study of various two-particle correlation functions involving photons and neutral pions is presented in proton-proton and lead-lead collisions at the LHC energy. The aim is to use these correlation functions to quantify the effect of the medium (in lead-lead collisions) on the jet decay properties. The calculations are carried out at the leading order in QCD but the next-to-leading order corrections are also discussed. The competition between different production mechanisms makes the connection between the jet energy loss spectrum and the gamma-pi correlations somewhat indirect while the gamma-gamma correlations have a clearer relation to the jet fragmentation properties.
|
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