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Wick rotation and the positivity of energy in quantum field theory: We propose a new axiom system for unitary quantum field theories on curved
space-time backgrounds, by postulating that the partition function and the
correlators extend analytically to a certain domain of complex-valued metrics.
Ordinary Riemannian met... | hep-th |
An extended standard model and its Higgs geometry from the matrix model: We find a simple brane configuration in the IKKT matrix model which resembles
the standard model at low energies, with a second Higgs doublet and
right-handed neutrinos. The electroweak sector is realized geometrically in
terms of two minimal fuzz... | hep-th |
Casimir Torque in Inhomogeneous Dielectric Plates: In this work, we consider a torque caused by the well known quantum
mechanical Casimir effect arising from quantized field fluctuations between
plates with inhomogeneous, sharply discontinuous, dielectric properties. While
the Casimir effect is a relatively well unders... | hep-th |
One-Loop Effective Action on the Four-Ball: This paper applies $\zeta$-function regularization to evaluate the 1-loop
effective action for scalar field theories and Euclidean Maxwell theory in the
presence of boundaries. After a comparison of two techniques developed in the
recent literature, vacuum Maxwell theory is s... | hep-th |
Anisotropic Dyonic Black Brane and its Effects on Hydrodynamics: We construct $SL(2,R)$ invariant in anisotropic medium, with a dual
anisotropic charged black hole geometry in massive gravity. We show how to
obtain $SL(2,R)$ elements in terms of new degrees of freedom for
Electromagnetic configuration, and construct th... | hep-th |
$N=2$ Super Yang-Mills and Subgroups of $SL(2,Z)$: We discuss $SL(2,Z)$ subgroups appropriate for the study of $N=2$ Super
Yang-Mills with $N_f=2n$ flavors. Hyperelliptic curves describing such theories
should have coefficients that are modular forms of these subgroups. In
particular, uniqueness arguments are sufficien... | hep-th |
HS in flat spacetime. The effective action method: This is the first paper in a series of three dealing with HS theories in flat
spacetime. It is divided in three parts. The first part is an elaboration on
the method of effective action, initiated in a previous paper. We study the
properties of correlators of currents ... | hep-th |
Supersymmetry Breaking and the Cosmological Constant: I review three attempts to explain the small value of the cosmological
constant, and their connection to SUSY breaking. They are The String Landscape,
Supersymmetric Large Extra Dimensions (SLED), and the Holographic Space-time
Formalism invented by Fischler and mys... | hep-th |
AdS Black Holes with a Bouncing Interior: We construct planar black hole solutions of AdS gravity minimally coupled to
a scalar field with an even, super-exponential potential. We show that the
evolution of the black hole interior exhibits an infinite sequence of Kasner
epochs, as the scalar field rolls back and forth ... | hep-th |
SDiff(2) Toda equation -- hierarchy, $τ$ function, and symmetries: A continuum limit of the Toda lattice field theory, called the SDiff(2) Toda
equation, is shown to have a Lax formalism and an infinite hierarchy of higher
flows. The Lax formalism is very similar to the case of the self-dual vacuum
Einstein equation an... | hep-th |
Field-theoretic Methods in Strongly-Coupled Models of General Gauge
Mediation: An often-exploited feature of the operator product expansion (OPE) is that it
incorporates a splitting of ultraviolet and infrared physics. In this paper we
use this feature of the OPE to perform simple, approximate computations of soft
ma... | hep-th |
Towards the description of anisotropic plasma at strong coupling: We initiate a study of anisotropic plasma at strong coupling using the
AdS/CFT correspondence. We construct an exact dual geometry which represents a
static uniform but anisotropic system and find, that although it is singular,
it allows for a notion of ... | hep-th |
On the "scattering law" for Kasner parameters appearing in asymptotics
of an exact S-brane solution: A multidimensional cosmological model with scalar and form fields [1-4] is
studied. An exact S-brane solution (either electric or magnetic) in a model
with l scalar fields and one antisymmetric form of rank m > 1 is c... | hep-th |
Noncommutative quantum mechanics as a constrained system: It is shown that quantum mechanics on noncommutative spaces (NQM) can be
obtained by the canonical quantization of some underlying second class
constrained system formulated in extended configuration space. It leads, in
particular, to an intriguing possibility o... | hep-th |
Area Operators in Holographic Quantum Gravity: We argue that the holographic formula relating entanglement entropy and the
area of a minimal surface is the key to define the area of surfaces in the
(emergent) spacetime from the dual theory on the boundary. So we promote the
entropy/area relation to operators to define ... | hep-th |
The NSVZ beta-function in supersymmetric theories with different
regularizations and renormalization prescriptions: We briefly review the calculations of quantum corrections related with the
exact NSVZ $\beta$-function in ${\cal N}=1$ supersymmetric theories, paying
especial attention to the scheme dependence of the ... | hep-th |
Semiclassical circular strings in AdS_5 and "long" gauge field strength
operators: We consider circular strings rotating with equal spins S_1=S_2=S in two
orthogonal planes in AdS_5 and suggest that they may be dual to "long" gauge
theory operators built out of self-dual components of gauge field strength. As
was fou... | hep-th |
From black holes to flux throats: polarization can resolve the
singularity: Supersymmetry-breaking is a key ingredient for string theory models to be
phenomenologically viable. We review the strong analogy in the physics and the
methods used for describing non-supersymmetric flux vacua and
non-supersymmetric black ho... | hep-th |
Derivative Expansion of the Effective Action for Massless Scalar
Electrodynamics in Arbitrary Gauge: It is shown how operator regularization can be used to obtain an expansion of
the effective action in powers of derivatives of the background field. This is
applied to massless scalar electrodynamics to find the one-l... | hep-th |
On Brane-Antibrane Forces: In this note, we will discuss two aspects of brane-antibrane forces. In one
aspect, we generalize the force calculation of D0-${\bar {\rm D}}$0 of Banks
and Susskind to Dp-${\bar {\rm D}}p$ for $1\le p \leq 8$. In particular, we
find that the force is also divergent for p = 1 while for the ot... | hep-th |
Background Independent Field Quantization with Sequences of
Gravity-Coupled Approximants II: Metric Fluctuations: We apply the new quantization scheme outlined in Phys. Rev. D102 (2020)
125001 to explore the influence which quantum vacuum fluctuations of the
spacetime metric exert on the universes of Quantum Einstein... | hep-th |
Complex linear superfields, Supercurrents and Supergravities: We present expressions for the supercurrents generated by a generic
$4D,~\mathcal{N}=1$ theory of complex linear superfield $\Sigma$. We verify
that these expressions satisfy the appropriate superspace conservation
equations. Furthermore, we discuss the comp... | hep-th |
Some Properties of Open - String Theories: Open-string theories may be related to suitable models of oriented closed
strings. The resulting construction of ``open descendants'' is illustrated in a
few simple cases that exhibit some of its key features. | hep-th |
A Deformation of Sasakian Structure in the Presence of Torsion and
Supergravity Solutions: We discuss a deformation of Sasakian structure in the presence of totally
skew-symmetric torsion by introducing odd dimensional manifolds whose metric
cones are K\"ahler with torsion. It is shown that such a geometry inherits
s... | hep-th |
One-loop divergences in the Galileon model: The investigation of UV divergences is a relevant step in better
understanding of a new theory. In this work the one-loop divergences in the
free field sector are obtained for the popular Galileons model. The
calculations are performed by the generalized Schwinger-DeWitt tech... | hep-th |
Orbifold instantons, moment maps and Yang-Mills theory with sources: We revisit the problem of constructing instantons on ADE orbifolds R^4/\Gamma
and point out some subtle relations with the complex structure on the orbifold.
We consider generalized instanton equations on R^4/\Gamma which are BPS
equations for the Yan... | hep-th |
A Variational Perturbation Approach to One-Point Functions in QFT: In this paper, we develop a variational perturbation (VP) scheme for
calculating vacuum expectation values (VEVs) of local fields in quantum field
theories. For a comparatively general scalar field model, the VEV of a
comparatively general local field i... | hep-th |
On Asymptotic Symmetries of 3d Extended Supergravities: We study asymptotic symmetry algebras for classes of three dimensional
supergravities with and without cosmological constant. In the first part we
generalise some of the non-Dirichlet boundary conditions of $AdS_3$ gravity to
extended supergravity theories, and co... | hep-th |
Manifestations of Space-Time Multidimensionality in Scattering of Scalar
Particles: We analyze a possibility of experimental detection of the contribution of the
Kaluza-Klein tower of heavy particles to scattering cross-section in a
six-dimensional scalar model with two dimensions being compactified to the
torus with... | hep-th |
Black Holes at Exp-time: Classical GR governs the evolution of black holes for a long time, but at
some exponentially large time it must break down. The breakdown, and what comes
after it, is not well understood. In this paper I'll discuss the problem using
concepts drawn from complexity geometry. In particular the geo... | hep-th |
The M-theory Archipelago: We combine supersymmetric localization results and the numerical conformal
bootstrap technique to study the 3d maximally supersymmetric (${\cal N} = 8$)
CFT on $N$ coincident M2-branes (the $U(N)_k \times U(N)_{-k}$ ABJM theory at
Chern-Simons level $k=1$). In particular, we perform a mixed co... | hep-th |
Anomaly-induced edge currents in hydrodynamics with parity anomaly: In this paper, we discuss relativistic hydrodynamics for a massless Dirac
fermion in $(2+1)$ dimensions, which has the parity anomaly -- a global 't
Hooft anomaly between $\mathrm{U}(1)$ and parity symmetries. We investigate how
hydrodynamics implement... | hep-th |
Aspects of three-dimensional C-metric: In this work, we present an extensive analysis of the thermodynamics and
holographic properties of three-dimensional C-metrics in the FG gauge, where we
find that the free energy is equal to the Euclidean on-shell action with a
generic conformal factor. For the black hole solution... | hep-th |
Time-dependent AdS/CFT Duality II: Holographic Reconstruction of Bulk
Metric and Possible Resolution of Singularity: We continue the studies of our earlier proposal for an AdS/CFT correspondence
for time-dependent supergravity backgrounds. We note that by performing a
suitable change of variables, the dual super Yang... | hep-th |
Temperature, Topology and Quantum Fields: This thesis uses Path Integrals and Green's Functions to study Gravity,
Quantum Field Theory and Statistical Mechanics, particularly with respect to:
finite temperature quantum systems of different spin in gravitational fields;
finite temperature interacting quantum systems in ... | hep-th |
Jet suppression in non-conformal plasma using AdS/CFT: In this paper, we study suppression of light quark in strongly coupled
non-conformal plasmas using the AdS/CFT correspondence. The well-known falling
string profile in the bulk is considered as light quark moving through the
plasma. The maximum distance which strin... | hep-th |
Nambu and the Ising Model: In 2021, to mark the occasion of 2021 was Y\^oichir\^o Nambu's birth
centenary, we engaged in writing a historical/scientific description of his
most incisive papers. Nambu was the humblest genius we have known, and we
expected to find some of his great but forgotten insights. We found one,
w... | hep-th |
Caustics in Self-gravitating N-body systems and Cosmological Large Scale
Structures: In this paper we demonstrate the generation of gravitational caustics that
appear due to the geodesic focusing in a self-gravitating N-body system. The
gravitational caustics are space regions where the density of particles is
higher... | hep-th |
N=2 Superstrings with (1,2m) Spacetime Signature: We show that the $N=2$ superstring in $d=2D\ge6$ real dimensions, with
criticality achieved by including background charges in the two real time
directions, exhibits a ``coordinate-freezing'' phenomenon, whereby the momentum
in one of the two time directions is constrai... | hep-th |
Flows involving Lifshitz solutions: We construct gravity solutions describing renormalization group flows
relating relativistic and non-relativistic conformal theories. We work both in
a simple phenomenological theory with a massive vector field, and in an N=4,
d=6 gauged supergravity theory, which can be consistently ... | hep-th |
Couplings for Compactifications: A general formula is obtained for Yukawa couplings in compactification on
\LGO{s} and corresponding \CY\ spaces. Up to the kinetic term normalizations,
this equates the classical Koszul ring structure with the \LGO\ chiral ring
structure and the true super\CFT\ ring structure. | hep-th |
Entanglement entropy in Galilean conformal field theories and flat
holography: We present the analytical calculation of entanglement entropy for a class of
two dimensional field theories governed by the symmetries of the Galilean
conformal algebra, thus providing a rare example of such an exact computation.
These fie... | hep-th |
An Étude on the Regularization and Renormalization of Divergences in
Primordial Observables: Many cosmological observables of interest derive from primordial vacuum
fluctuations evolved to late times. These observables represent statistical
draws from some underlying quantum or statistical field theoretic framework
w... | hep-th |
Revisiting Gribov's Copies Inside The Horizon: In this work, we recover the problem of legitimate topologically trivial
Gribov copies inside the Gribov horizon. We avoid the reducibility problem
which hampered the standard construction of van Baal, and then we are able to
build a valid example with spherical symmetry. ... | hep-th |
A local and integrable lattice regularization of the massive Thirring
model: The light--cone lattice approach to the massive Thirring model is
reformulated using a local and integrable lattice Hamiltonian written in terms
of discrete fermi fields. Several subtle points concerning boundary conditions,
normal--ordering... | hep-th |
Sasaki-Ricci flow equation on five-dimensional Sasaki-Einstein space
$Y^{p,q}$: We analyze the transverse K\"{a}hler-Ricci flow equation on Sasaki-Ein\-stein
space $Y^{p,q}$. Explicit solutions are produced representing new
five-dimensional Sasaki structures. Solutions which do not modify the
transverse metric preser... | hep-th |
Simple Current Extensions and Mapping Class Group Representations: The conjecture of Fuchs, Schellekens and Schweigert on the relation of
mapping class group representations and fixed point resolution in simple
current extensions is investigated, and a cohomological interpretation of the
untwisted stabilizer is given. | hep-th |
Gauge Fields, Fermions and Mass Gaps in 6D Brane Worlds: We study fluctuations about axisymmetric warped brane solutions in 6D minimal
gauged supergravity. Much of our analysis is general and could be applied to
other scenarios. We focus on bulk sectors that could give rise to Standard
Model gauge fields and charged ma... | hep-th |
Syncyclons or Solitonic Signals from Extra Dimensions: In theories where spacetime is a direct product of Minkowski space ($M^4$)
and a d dimensional compact space ($K^d$), there can exist topological solitons
that simultaneously wind around $R^3$ (or $R^2$ or $R^1$) in $M^4$ and the
compact dimensions. A paradigmatic ... | hep-th |
Gibbs entropy from entanglement in electric quenches: In quantum electrodynamics with charged fermions, a background electric field
is the source of the chiral anomaly which creates a chirally imbalanced state
of fermions. This chiral state is realized through the production of entangled
pairs of right-moving fermions ... | hep-th |
Mesons from (non) Abelian T-dual backgrounds: In this work we study mesonic excitations in a Quantum Field Theory dual to
the non Abelian T-dual of $AdS_5\times S^5$, using a D6 brane probe on the
Sfetsos-Thompson background. Before and after the duality, we observe
interesting differences between the spectra and inter... | hep-th |
Noncommutative differential geometry with higher order derivatives: We build a toy model of differential geometry on the real line, which
includes derivatives of the second order. Such construction is possible only
within the framework of noncommutative geometry. We introduce the metric and
briefly discuss two simple p... | hep-th |
Supersymmetry Enhancement of D-p-branes and M-branes: We examine the supersymmetry of classical D-brane and M-brane configurations
and explain the dependence of Killing spinors on coordinates. We find that one
half supersymmetry is broken in the bulk and that supersymmetry near the
D-brane horizon is restored for $p\le... | hep-th |
Gravity = Yang-Mills: This essay's title is justified by discussing a class of Yang-Mills-type
theories of which standard Yang-Mills theories are special cases but which is
broad enough to include gravity as a double field theory. We use the framework
of homotopy algebras, where conventional Yang-Mills theory is the te... | hep-th |
Coset Symmetries in Dimensionally Reduced Bosonic String Theory: We discuss the dimensional reduction of various effective actions,
particularly that of the closed Bosonic string and pure gravity, to two and
three dimensions. The result for the closed Bosonic string leads to coset
symmetries which are in agreement with... | hep-th |
3d mirror for Argyres-Douglas theories: 3d mirrors for all 4d $\mathcal{N}=2$ Argyres-Douglas (AD) theories
engineered using 6d $(2,0)$ theory are found. The basic steps are: 1): Find a
punctured sphere representation for the AD theories (this is achieved in our
previous studies of S duality); 2): Attach a 3d theory fo... | hep-th |
Berry's phase in noncommutative spaces: We introduce the perturbative aspects of noncommutative quantum mechanics.
Then we study the Berry's phase in the framework of noncommutative quantum
mechanics. The results show deviations from the usual quantum mechanics which
depend on the parameter of space/space noncommtativi... | hep-th |
Moduli Thermalization and Finite Temperature Effects in "Big" Divisor
Large Volume D3/D7 Swiss-Cheese Compactification: In the context of Type IIB compactified on a large volume Swiss-Cheese
orientifold in the presence of a mobile space-time filling D3-brane and stacks
of fluxed D7-branes wrapping the "big" divisor S... | hep-th |
Casimir force in noncommutative Randall-Sundrum models revisited: We propose another method to compute the Casimir force in noncommutative
Randall-Sundrum braneworld model considered by K. Nouicer and Y. Sabri
recently. Our method can be used to compute the Casimir force to any order in
the noncommutative parameter. Co... | hep-th |
Loops in AdS: From the Spectral Representation to Position Space II: We continue the study of AdS loop amplitudes in the spectral representation
and in position space. We compute the finite coupling 4-point function in
position space for the large-$N$ conformal Gross Neveu model on $AdS_3$. The
resummation of loop bubb... | hep-th |
The Standard Model with gravity couplings: In this paper, we examine the coupling of matter fields to gravity within the
framework of the Standard Model of particle physics. The coupling is described
in terms of Weyl fermions of a definite chirality, and employs only
(anti)self-dual or left-handed spin connection field... | hep-th |
Why is AI hard and Physics simple?: We discuss why AI is hard and why physics is simple. We discuss how physical
intuition and the approach of theoretical physics can be brought to bear on the
field of artificial intelligence and specifically machine learning. We suggest
that the underlying project of machine learning ... | hep-th |
Many-Particle Quantum Cosmology: The Einstein-Friedmann Universe as whole quantum object can be treated as
bosonic string mass groundstate, called a tachyon, having negative mass square
and a speed more than the speed of light. I present a brief review of results
obtained from this point of view called Many-Particle Qu... | hep-th |
Higher Order Corrections to Holographic Black Hole Chemistry: We investigate the holographic Smarr relation beyond the large N limit. By
making use of the holographic dictionary, we find that the bulk correlates of
sub-leading 1/N corrections to this relation are related to the couplings in
Lovelock gravity theories. W... | hep-th |
Effective long distance $q\bar{q} $ potential in holographic RG flows: We study the $q\bar{q}$ potential in strongly coupled non-conformal field
theories with a non-trivial renormalization group flow via holography. We focus
on the properties of this potential at an inter-quark separation $L$ large
compared to the char... | hep-th |
Quantized rotating Taub-bolt instantons: We argue that previously suggested metrics for rotating Taub-bolt instantons
do not satisfy all the necessary regularity conditions, and we present a family
of new regular rotating Taub-bolts labelled by an odd integer $k$. There are
two types of rotating bolt solutions. The fir... | hep-th |
$S^7$ Current Algebras: We present $S^7$-algebras as generalized Kac-Moody algebras. A number of
free-field representations is found. We construct the octonionic projective
spaces ${\O}P^N$. | hep-th |
SU(2)/SL(2) knot invariants and KS monodromies: We review the Reshetikhin-Turaev approach to construction of non-compact knot
invariants involving R-matrices associated with infinite-dimensional
representations, primarily those made from Faddeev's quantum dilogarithm. The
corresponding formulas can be obtained from mod... | hep-th |
Closed string exchanges on $C^2/Z_2$ in a background B-field: In an earlier work it was shown that the IR singularities arising in the
nonplanar one loop two point function of a noncommutative ${\cal N}=2$ gauge
theory can be reproduced exactly from the massless closed string exchanges. The
noncommutative gauge theory ... | hep-th |
Supersymmetric index on T^2 x S^2 and elliptic genus: We study partition function of four-dimensional $\mathcal{N}=1$
supersymmetric field theory on $T^2 \times S^2$. By applying supersymmetry
localization, we show that the $T^2 \times S^2$ partition function is given by
elliptic genus of certain two-dimensional $\math... | hep-th |
General covariance, and supersymmetry without supersymmetry: An unusual four-dimensional generally covariant and supersymmetric SU(2)
gauge theory is described. The theory has propagating degrees of freedom, and
is invariant under a local (left-handed) chiral supersymmetry, which is half
the supersymmetry of supergravi... | hep-th |
Chasing the cuprates with dilatonic dyons: Magnetic field and momentum dissipation are key ingredients in describing
condensed matter systems. We include them in gauge/gravity and systematically
explore the bottom-up panorama of holographic IR effective field theories based
on bulk Einstein-Maxwell Lagrangians plus sca... | hep-th |
One-dimensional sigma-models with N=5,6,7,8 off-shell supersymmetries: We computed the actions for the 1D N=5 sigma-models with respect to the two
inequivalent (2,8,6) multiplets. 4 supersymmetry generators are manifest, while
the constraint originated by imposing the 5-th supersymmetry automatically
induces a full N=8... | hep-th |
A Lorentz-violating SO(3) model: discussing the unitarity, causality and
the 't Hooft-Polyakov monopoles: In this paper, we extend the analysis of the Lorentz-violating Quantum
Eletrodynamics to the non-Abelian case: an SO(3) Yang-Mills Lagrangian with the
addition of the non-Abelian Chern-Simons-type term. We consid... | hep-th |
Superstring scattering amplitudes in higher genus: In this paper we continue the program pioneered by D'Hoker and Phong, and
recently advanced by Cacciatori, Dalla Piazza, and van Geemen, of finding the
chiral superstring measure by constructing modular forms satisfying certain
factorization constraints. We give new ex... | hep-th |
$ε$-Expansion in the Gross-Neveu Model from Conformal Field
Theory: We compute the anomalous dimensions of a class of operators of the form
$(\bar\psi\psi)^p$ and $(\bar\psi\psi)^p\psi$ to leading order in $\epsilon$ in
the Gross-Neveu model in $2+\epsilon$ dimensions. We use the techniques
developed in arXiv: 1505.0... | hep-th |
Gravitating Cho-Maison Monopole: We study numerical solutions corresponding to spherically symmetric
gravitating electroweak monopole and magnetically charged black holes of the
Einstein-Weinberg-Salam theory. The gravitating electroweak monopole solutions
are quite identical to the gravitating monopole solution in SU(... | hep-th |
Gauge equivalent universes in 5d Kaluza-Klein theory: We examine in the framework of 5d Kaluza-Klein theory the gauge equivalence
of $x^5$-dependent cosmological solutions each of which describes in the 4d
sector an arbitrarily evolving isotropic, homogeneous universe with some pure
gauge. We find that (1)within a cert... | hep-th |
Constraints on the quantum state of pairs produced by semiclassical
black holes: The pair-production process for a black hole (BH) is discussed within the
framework of a recently proposed semiclassical model of BH evaporation. Our
emphasis is on how the requirements of unitary evolution and strong
subadditivity act t... | hep-th |
3d superconformal indices and isomorphisms of M2-brane theories: We test several expected isomorphisms between the U(N)xU(N) ABJM theory and
(SU(N)xSU(N))/Z_N theory including the BLG theory by comparing their
superconformal indices. From moduli space analysis, it is expected that this
equivalence can hold if and only ... | hep-th |
Holographic line defects in F(4) gauged supergravity: In this note we construct a solution of six-dimensional $F(4)$ gauged
supergravity using $AdS_2\times S^3$ warped over an interval as an ansatz. The
solution is completely regular, preserves eight of the sixteen supersymmetries
of the $AdS_6$ vacuum and is a hologra... | hep-th |
On the Non-renormalization of the AdS Radius: We show that the relation between the 't Hooft coupling and the radius of AdS
is not renormalized at one-loop in the sigma model perturbation theory. We
prove this by computing the quantum effective action for the superstring on
AdS_5 x S^5 and showing that it does not rece... | hep-th |
Twistors and supertwistors for exceptional field theory: As a means of examining the section condition and its possible solutions and
relaxations, we perform twistor transforms related to versions of exceptional
field theory with Minkowski signature. The spinor parametrisation of the
momenta naturally solves simultaneo... | hep-th |
On RG-flow and the Cosmological Constant: The AdS/CFT correspondence implies that the effective action of certain
strongly coupled large $N$ gauge theories satisfy the Hamilton-Jacobi equation
of 5d gravity. Using an analogy with the relativistic point particle, I
construct a low energy effective action that includes t... | hep-th |
Holographic free energy and thermodynamic geometry: We analytically obtain the free energy and thermodynamic geometry of
holographic superconductors in $2+1$-dimensions. The gravitational theory in
the bulk dual to this $2+1$-dimensional strongly coupled theory lives in the
$3+1$-dimensions and is that of a charged $Ad... | hep-th |
Gauge theory in deformed N=(1,1) superspace: We review the non-anticommutative Q-deformations of N=(1,1) supersymmetric
theories in four-dimensional Euclidean harmonic superspace. These deformations
preserve chirality and harmonic Grassmann analyticity. The associated field
theories arise as a low-energy limit of strin... | hep-th |
The Dark Dimension, the Swampland, and the Dark Matter Fraction Composed
of Primordial Near-Extremal Black Holes: In a recent publication we studied the decay rate of primordial black holes
perceiving the dark dimension, an innovative five-dimensional (5D) scenario
that has a compact space with characteristic length-... | hep-th |
Multiple Soft Limits of Cosmological Correlation Functions: We derive novel identities satisfied by inflationary correlation functions in
the limit where two external momenta are taken to be small. We derive these
statements in two ways: using background-wave arguments and as Ward identities
following from the fixed-ti... | hep-th |
Constructing near-horizon geometries in supergravities with hidden
symmetry: We consider the classification of near-horizon geometries in a general
two-derivative theory of gravity coupled to abelian gauge fields and uncharged
scalars in four and five dimensions, with one and two commuting rotational
symmetries respe... | hep-th |
States and amplitudes for finite regions in a two-dimensional Euclidean
quantum field theory: We quantize the Helmholtz equation (plus perturbative interactions) in two
dimensions to illustrate a manifestly local description of quantum field
theory. Using the general boundary formulation we describe the quantum dynam... | hep-th |
Stringy Cosmic Strings and Axion Cohomology: The static stationary axially symmetric background ("infinite cosmic string")
of the $D=4$ string theory provided with an axion charge is studied in the
effective theory approach. The most general exact solution is constructed. It
is found that the Kalb-Ramond axion charge, ... | hep-th |
On the Liouville 2D dilaton gravity models with sinh-Gordon matter: We study 1+1 dimensional dilaton gravity models which take into account
backreaction of the sinh-Gordon matter field. We found a wide class of exact
solutions which generalizes black hole solutions of the Jackiw-Teitelboim
gravity model and its hyperbo... | hep-th |
Odd Nambu bracket on Grassmann algebra: The Grassmann-odd Nambu bracket on the Grassmann algebra is proposed. | hep-th |
Wigner Representation Theory of the Poincare Group, Localization,
Statistics and the S-Matrix: It has been known that the Wigner representation theory for positive energy
orbits permits a useful localization concept in terms of certain lattices of
real subspaces of the complex Hilbert -space. This ''modular localizat... | hep-th |
String duality and massless string states: We are discussing the $S$ \& $T$ duality for special class of heterotic
string configurations. This class of solutions includes various types of black
hole solutions and Taub-NUT geometries. It allows a self-dual point for both
dualities which corresponds to massless configura... | hep-th |
Improved Holographic QCD: We provide a review to holographic models based on Einstein-dilaton gravity
with a potential in 5 dimensions. Such theories, for a judicious choice of
potential are very close to the physics of large-N YM theory both at zero and
finite temperature. The zero temperature glueball spectra as well... | hep-th |
The Gribov problem in presence of background field for $SU(2)$
Yang-Mills theory: The Gribov problem in the presence of a background field is analyzed: in
particular, we study the Gribov copies equation in the Landau-De Witt gauge as
well as the semi-classical Gribov gap equation. As background field, we choose
the s... | hep-th |
Calculation of Green-Schwarz Superstring Amplitudes Using the N=2
Twistor-String Formalism: The manifestly SU(4)xU(1) super-Poincare invariant free-field N=2 twistor-
string action for the ten-dimensional Green-Schwarz superstring is quantized
using standard BRST methods. Unlike the light-cone and semi-light-cone
gau... | hep-th |
Two interacting conformal Carroll particles: In this note we analyse two different models of two interacting conformal
Carroll particles that can be obtained as the Carrollian limit of two
relativistic conformal particles. The first model describes particles with zero
velocity and exhibits infinite dimensional symmetri... | hep-th |
The ultrarelativistic limit of Kerr: The massless (or ultrarelativistic) limit of a Schwarzschild black hole with
fixed energy was determined long ago in the form of the Aichelburg-Sexl
shockwave, but the status of the same limit for a Kerr black hole is less
clear. In this paper, we explore the ultrarelativistic limit... | hep-th |
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