text stringlengths 89 2.49k | category stringclasses 19
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Anomaly Cancellations in the Type I D9-anti-D9 System and the USp(32)
String Theory: We check some consistency conditions for the D9-anti-D9 system in type I
string theory. The gravitational anomaly and gauge anomaly for SO(n) x SO(m)
gauge symmetry are shown to be cancelled when n-m=32. In addition, we find that
a s... | hep-th |
Slowly rotating black holes in Quasi-topological gravity: While cubic Quasi-topological gravity is unique, there is a family of quartic
Quasi-topological gravities in five dimensions. These theories are defined by
leading to a first order equation on spherically symmetric spacetimes,
resembling the structure of the equ... | hep-th |
Surgical invariants of four-manifolds: A new topological invariant of closed connected orientable four-dimensional
manifolds is proposed. The invariant, constructed via surgery on a special
link, is a four-dimensional counterpart of the celebrated SU(2) three-manifold
invariant of Reshetikhin, Turaev and Witten. | hep-th |
Brane solutions in strings with broken supersymmetry and dilaton
tadpoles: The tachyon-free nonsupersymmetric string theories in ten dimensions have
dilaton tadpoles which forbid a Minkowski vacuum. We determine the maximally
symmetric backgrounds for the $USp(32)$ Type I string and the $SO(16)\times
SO(16)$ heteroti... | hep-th |
Superconformal mechanics, black holes, and non-linear realizations: The OSp(2|2)-invariant planar dynamics of a D=4 superparticle near the
horizon of a large mass extreme black hole is described by an N=2
superconformal mechanics, with the SO(2) charge being the superparticle's
angular momentum. The {\it non-manifest} ... | hep-th |
The Standard Model, The Exceptional Jordan Algebra, and Triality: Jordan, Wigner and von Neumann classified the possible algebras of quantum
mechanical observables, and found they fell into 4 "ordinary" families, plus
one remarkable outlier: the exceptional Jordan algebra. We point out an
intriguing relationship betwee... | hep-th |
Closed Superstrings in a Uniform Magnetic Field and Regularization
Criterion: We summarize exact solutions of closed superstrings in a constant magnetic
field, from a view point of the regularization criterion. Some models will be
excluded according to this criterion. The spectrum-generating algebra is also
construct... | hep-th |
Fluctuations of inflationary magnetogenesis: This analysis aims at exploring what can be said about the growth rate of
magnetized inhomogeneities under two concurrent hypotheses: a phase of quasi-de
Sitter dynamics driven by a single inflaton field and the simultaneous presence
of a spectator field coupled to gravity a... | hep-th |
Explaining the Electroweak Scale and Stabilizing Moduli in M Theory: In a recent paper \cite{Acharya:2006ia} it was shown that in $M$ theory vacua
without fluxes, all moduli are stabilized by the effective potential and a
stable hierarchy is generated, consistent with standard gauge unification. This
paper explains the... | hep-th |
On the instability of 3d null singularities: String propagation on a three-dimensional Lorentzian string orbifold with a
null singularity has been studied by Horowitz and Steif, and more recently by
Liu, Moore and Seiberg. We analyze the target space as a classical
gravitational background. The singularity becomes spac... | hep-th |
Decomposing the SU(N) Connection and the Wu-Yang Potential: Based on the decomposition of SU(2) gauge field, we derive a generalization
of the decomposition theory for the SU(N) gauge field. We thus obtain the
invariant electro-magnetic tensors of SU(N) groups and the extended Wu-Yang
potentials. The sourceless solutio... | hep-th |
Aspects of the Holographic Study of Flavor Dynamics: This thesis is dedicated to the holographic study of flavor dynamics. The
technique employed is a D7-brane probing of various D3-brane backgrounds. The
first topic covered studies the influence of an external magnetic field on a
flavored large N Yang-Mills theory. Th... | hep-th |
Moduli space volume of vortex and localization: Volume of moduli space of BPS vortices on a compact genus h Riemann surface
Sigma_h is evaluated by means of topological field theory and localization
technique. Vortex in Abelian gauge theory with a single charged scalar field
(ANO vortex) is studied first and is found t... | hep-th |
Calculating Casimir Energies in Renormalizable Quantum Field Theory: Quantum vacuum energy has been known to have observable consequences since
1948 when Casimir calculated the force of attraction between parallel uncharged
plates, a phenomenon confirmed experimentally with ever increasing precision.
Casimir himself su... | hep-th |
Unification of twistors and Ramond vectors: We generalize the idea of supertwistors and introduce a new supersymmetric
object - the $\theta$-twistor which includes the composite Ramond vector [11]
well known from the spinning string dynamics. The symmetries of the chiral
$\theta$-twistor superspace are studied. It is s... | hep-th |
Preheating with Fractional Powers: We consider preheating in models in which the potential for the inflaton is
given by a fractional power, as is the case in axion monodromy inflation. We
assume a standard coupling between the inflaton field and a scalar matter
field. We find that in spite of the fact that the oscillat... | hep-th |
Metric and coupling reversal in string theory: Invariance under reversing the sign of the metric G_{MN}(x) and/or the sign
of the string coupling field H(x), where <H(x)> = g_s, leads to four possible
Universes denoted 1,I,J,K according as (G,H) goes to (G,H), (-G,H), (-G,-H),
(G,-H), respectively. Universe 1 is descri... | hep-th |
String versus Einstein frame in an AdS/CFT induced quantum dilatonic
brane-world universe: AdS/CFT induced quantum dilatonic brane-world where 4d boundary is flat or de
Sitter (inflationary) or Anti-de Sitter brane is considered. The classical
brane tension is fixed but boundary QFT produces the effective brane tensi... | hep-th |
The Casimir effect with quantized charged spinor matter in background
magnetic field: We study the influence of a background uniform magnetic field and boundary
conditions on the vacuum of a quantized charged spinor matter field confined
between two parallel neutral plates; the magnetic field is directed
orthogonally... | hep-th |
Brackets, Sigma Models and Integrability of Generalized Complex
Structures: It is shown how derived brackets naturally arise in sigma-models via Poisson-
or antibracket, generalizing a recent observation by Alekseev and Strobl. On
the way to a precise formulation of this relation, an explicit coordinate
expression fo... | hep-th |
Thermodynamics of accelerating AdS$_4$ black holes from the covariant
phase space: We study the charges and first law of thermodynamics for accelerating,
non-rotating black holes with dyonic charges in AdS$_4$ using the covariant
phase space formalism. In order to apply the formalism to these solutions
(which are asy... | hep-th |
A note about a new class of two-kinks: We present a model of two-kinks resulting from an explicit composition of two
standards kinks of the $\phi^4$ model based on the procedure of Ref.
\cite{uchiyama}. The two-kinks have an additional parameter accounting for the
separation of the standard kinks of $\phi^4$ model. We ... | hep-th |
Schwinger Pair Production in dS_2 and AdS_2: We study Schwinger pair production in scalar QED from a uniform electric
field in dS_2 with scalar curvature R_{dS} = 2 H^2 and in AdS_2 with R_{AdS} =
- 2 K^2. With suitable boundary conditions, we find that the pair-production
rate is the same analytic function of the scal... | hep-th |
Multiple Membranes in M-theory: We review developments in the theory of multiple, parallel membranes in
M-theory. After discussing the inherent difficulties pertaining to a maximally
supersymmetric lagrangian formulation with the appropriate field content and
symmetries, we discuss how introducing the concept of 3-alge... | hep-th |
The Hydrohedron: Bootstrapping Relativistic Hydrodynamics: As an effective theory, relativistic hydrodynamics is fixed by symmetries up
to a set of transport coefficients. A lot of effort has been devoted to
explicit calculations of these coefficients. Here we propose a shift in
perspective: we deploy bootstrap techniq... | hep-th |
Standard Models and Split Supersymmetry from Intersecting Brane
Orbifolds: We construct four dimensional three generation non-supersymmetric $SU(3)_c
\times SU(2)_L \times U(1)_Y$ intersecting D6-brane models with $\nu_R$\rq{s}.
At three stacks we find exactly the MSSM chiral fermion matter spectrum. At 4-,
5-stacks ... | hep-th |
Reggeized gluon states in Quantum Chromodynamics: The reggeized gluon states, which are also called Reggeons, appear in the
scattering amplitude of hadrons in Regge limit. The wave-function of Reggeons
satisfy the BKP equation, which in multi-colour limit of Quantum Chromodynamics
is equivalent to the Schrodinger equat... | hep-th |
Kac-Moody Algebras in M-theory: In this thesis, we consider several aspects of over-extended and
very-extended Kac-Moody algebras in relation with theories of gravity coupled
to matter. In the first part, we focus on the occurrence of KM algebras in the
cosmological billiards. We analyse the billiards in the simplified... | hep-th |
Coulomb interaction from the interplay between Confinement and Screening: It has been noticed that confinement effects can be described by the addition
of a $ \sqrt {- F_{\mu \nu}^a F^{a\mu \nu}} $ term in the Lagrangian density.
We now study the combined effect of such "confinement term" and that of a mass
term. The s... | hep-th |
Emergent Gravity from Noncommutative Spacetime: We showed before that self-dual electromagnetism in noncommutative (NC)
spacetime is equivalent to self-dual Einstein gravity. This result implies a
striking picture about gravity: Gravity can emerge from electromagnetism in NC
spacetime. Gravity is then a collective phen... | hep-th |
Optical Properties of a θ-Vacuum: Chern-Simons (CS) forms generalize the minimal coupling between gauge
potentials and point charges, to sources represented by charged extended
objects (branes). The simplest example of such a CS-brane coupling is a domain
wall coupled to the electromagnetic CS three-form. This describe... | hep-th |
String creation in D6-brane background: The production of string charge during a crossing of certain oriented
D-branes is studied. We compute the string charge in the system of a probe
D2-brane and a background D6-brane by use of the equations of motion in the
ten-dimensions. We confirm the creation of string charge as... | hep-th |
Hamiltonian Dynamics of Cosmological Quintessence Models: The time-evolution dynamics of two nonlinear cosmological real gas models has
been reexamined in detail with methods from the theory of Hamiltonian dynamical
systems. These examples are FRWL cosmologies, one based on a gas, satisfying
the van der Waals equation ... | hep-th |
Magnetic monopoles and symmetries in noncommutative space: In this paper, we review the progress in the analysis of magnetic monopoles
as generalized states in quantum mechanics. We show that the considered model
contains rich algebraic structure that generates symmetries which have been
utilized in different physical ... | hep-th |
BPS Equations and the Stress Tensor: We exploit the relationship between the space components of the
energy-momentum tensor and the supercurrent to discuss the connection between
the BPS equations and the vanishing of the components of the stress tensor in
various supersymmetric theories with solitons.
Using the fact... | hep-th |
Nonsupersymmetric Brane/Antibrane Configurations in Type IIA and M
Theory: We study metastable nonsupersymmetric configurations in type IIA string
theory, obtained by suspending D4-branes and anti-D4-branes between
holomorphically curved NS5's, which are related to those of hep-th/0610249 by
T-duality. When the numbe... | hep-th |
On orbifolds and free fermion constructions: This work develops the correspondence between orbifolds and free fermion
models. A complete classification is obtained for orbifolds X/G with X the
product of three elliptic curves and G an abelian extension of a group (Z_2)^2
of twists acting on X. Each such quotient X/G is... | hep-th |
Baxter operators for arbitrary spin II: This paper presents the second part of our study devoted to the construction
of Baxter operators for the homogeneous closed XXX spin chain with the quantum
space carrying infinite or finite-dimensional $s\ell_2$ representations. We
consider the Baxter operators used in \cite{BLZ,... | hep-th |
Multiboson Expansions for the q-Oscillator and $SU(1,1)_q$: All the hermitian representations of the ``symmetric" $q$-oscillator are
obtained by means of expansions. The same technique is applied to characterize
in a systematic way the $k$-order boson realizations of the $q$-oscillator and
$su(1,1)_q$. The special role... | hep-th |
Some inequalities bridging stringy parameters and cosmological
observables: By demanding the validity of an effective field theory description during
inflation, in this note we derive some peculiar inequalities among the three
interesting stringy and cosmological parameters, namely the tensor-to-scalar
ratio ($r$), t... | hep-th |
String Theory on AdS_3: It was shown by Brown and Henneaux that the classical theory of gravity on
AdS_3 has an infinite-dimensional symmetry group forming a Virasoro algebra.
More recently, Giveon, Kutasov and Seiberg (GKS) constructed the corresponding
Virasoro generators in the first-quantized string theory on AdS_3... | hep-th |
Edge States and Entanglement Entropy: It is known that gauge fields defined on manifolds with spatial boundaries
support states localized at the boundaries. In this paper, we demonstrate how
coarse-graining over these states can lead to an entanglement entropy. In
particular, we show that the entanglement entropy of th... | hep-th |
Manifestly Supersymmetric Lax Integrable Hierarchies: A systematic method of constructing manifestly supersymmetric
$1+1$-dimensional KP Lax hierarchies is presented. Closed expressions for the
Lax operators in terms of superfield eigenfunctions are obtained. All hierarchy
equations being eigenfunction equations are sh... | hep-th |
Exact O(d,d) Transformations in WZW Models: Using the algebraic Hamiltonian approach, we derive the exact to all orders
O(d,d) transformations of the metric and the dilaton field in WZW and WZW coset
models for both compact and non-compact groups. It is shown that under the
exact $O(d)\times O(d)$ transformation only t... | hep-th |
Local quenches and quantum chaos from higher spin perturbations: We study local quenches in 1+1 dimensional conformal field theories at
large-c by operators carrying higher spin charge. Viewing such states as
solutions in Chern-Simons theory, representing infalling massive particles with
spin-three charge in the BTZ ba... | hep-th |
Spontaneous fragmentation of topological black holes: We study the metastability of Anti-de Sitter topological black holes with
compact hyperbolic horizons. We focus on the five-dimensional case, an AdS/CFT
dual to thermal states in the maximally supersymmetric large-N Yang-Mills
theory, quantized on a three-dimensiona... | hep-th |
Noncommutative gravity in three dimensions coupled to point-like sources: Noncommutative gravity in three dimensions with no cosmological constant is
reviewed. We find a solution which describes the presence of a torsional
source. | hep-th |
Oxidation = group theory: Dimensional reduction of theories involving (super-)gravity gives rise to
sigma models on coset spaces of the form G/H, with G a non-compact group, and H
its maximal compact subgroup. The reverse process, called oxidation, is the
reconstruction of the possible higher dimensional theories, give... | hep-th |
Observing braneworld black holes: Spacetime in the vicinity of an event horizon can be probed using
observations which explore the dynamics of the accretion disc. Many high energy
theories of gravity lead to modifications of the near horizon regime,
potentially providing a testing ground for these theories. In this pap... | hep-th |
Eleven dimensional supergravity as a constrained topological field
theory: We describe a new first-order formulation of D=11 supergravity which shows
that that theory can be understood to arise from a certain topological field
theory by the imposition of a set of local constraints on the fields, plus a
lagrange multi... | hep-th |
Evaluation of Periods via Fibrations in Seiberg-Witten Theories and in
Type-II String: We show how to evaluate the periods in Seiberg-Witten theories and in
K3-fibered Calabi-Yau manifolds by using fibrations of the theories. In the
Seiberg-Witten theories, it is shown that the dual pair of fields can be
constructed ... | hep-th |
Weyl-Invariant Higher Curvature Gravity Theories in n Dimensions: We study the particle spectrum and the unitarity of the generic n-dimensional
Weyl-invariant quadratic curvature gravity theories around their (anti-)de
Sitter [(A)dS] and flat vacua. Weyl symmetry is spontaneously broken in (A)dS
and radiatively broken ... | hep-th |
A note on conformal symmetry in projective superspace: We describe a sufficient condition for actions constructed in projective
superspace to possess an SU(2) R-symmetry. We check directly that this
condition implies that the corresponding hyperkahler varieties, constructed by
means of the generalized Legendre transfor... | hep-th |
A Note on Multi-trace Deformations and AdS/CFT: We derive the general formula, at a finite cutoff, for the change in the
boundary condition of a scalar field in AdS under a Multiple-trace deformation
of the dual CFT. Our analysis suggests that fluctuations around the classical
solution in AdS should not be constrained ... | hep-th |
Superluminality in dilatationally invariant generalized Galileon
theories: We consider small perturbations about homogeneous backgrounds in
dilatationally-invariant Galileon models. The issues we address are stability
(absence of ghosts and gradient instabilities) and superluminality. We show
that in Minkowski backgr... | hep-th |
Topologically Massive Gravity from the Heterotic String: Topologically massive gravity (TMG) in three dimensions provides an
interesting toy model for constructing a quantum theory of gravity. Although it
can be thought of as standing as a theory in its own right, it is also of
interest to see whether it can be describ... | hep-th |
Einstein gravity 3-point functions from conformal field theory: We study stress tensor correlation functions in four-dimensional conformal
field theories with large $N$ and a sparse spectrum. Theories in this class are
expected to have local holographic duals, so effective field theory in anti-de
Sitter suggests that t... | hep-th |
Comments on gluon scattering amplitudes via AdS/CFT: In this article we consider n gluon color ordered, planar amplitudes in N=4
super Yang Mills at strong 't Hooft coupling. These amplitudes are approximated
by classical surfaces in AdS_5 space. We compute the value of the amplitude for
a particular kinematic configur... | hep-th |
Excited Hexagon Wilson Loops for Strongly Coupled N=4 SYM: This work is devoted to the six-gluon scattering amplitude in strongly
coupled N=4 supersymmetric Yang-Mills theory. At weak coupling, an appropriate
high energy limit of the so-called remainder function, i.e. of the deviation
from the BDS formula, may be under... | hep-th |
Numerical Solution of the Ekpyrotic Scenario in the Moduli Space
Approximation: A numerical solution to the equations of motion for the ekpyrotic bulk brane
scenario in the moduli space approximation is presented. The visible universe
brane has positive tension, and we use a potential that goes to zero
exponentially ... | hep-th |
Old and new vacua of 5D maximal supergravity: We look for critical points with U(2) residual symmetry in 5-dimensional
maximally supersymmetric gauged supergravity, by varying the embedding tensor,
rather than directly minimizing the scalar potential. We recover all previously
known vacua and we find four new vacua, wi... | hep-th |
Closed time like curve and the energy condition in 2+1 dimensional
gravity: We consider gravity in 2+1 dimensions in presence of extended stationary
sources with rotational symmetry. We prove by direct use of Einstein's
equations that if i) the energy momentum tensor satisfies the weak energy
condition, ii) the unive... | hep-th |
Classical Solutions in Two-Dimensional String Theory and Gravitational
Collapse: A general solution to the $D=2$ 1-loop beta functions equations including
tachyonic back reaction on the metric is presented. Dynamical black hole
(classical) solutions representing gravitational collapse of tachyons are
constructed. A d... | hep-th |
Grassmannian sigma model on a finite interval: We discuss the two-dimensional Grassmannian sigma model $\mathbb{G}_{N, M}$
on a finite interval $L$. The different boundary conditions which allow to
obtain analytical solutions by the saddle-point method in the large $N$ limit
are considered. The nontrivial phase structu... | hep-th |
Area Potentials and Deformation Quantization: Systems built out of N-body interactions, beyond 2-body interactions, are
formulated on the plane, and investigated classically and quantum mechanically
(in phase space). Their Wigner Functions--the density matrices in phase-space
quantization--are given and analyzed. | hep-th |
Realization of symmetries and the c-theorem: We discuss the relation between the $c$--theorem and the the way various
symmetries are realized in quantum field theory. We review our recent proof of
the $c$--theorem in four dimensions. Based on this proof and further evidence,
we conjecture that the realization of chiral... | hep-th |
Analytic Results for Loop-Level Momentum Space Witten Diagrams: This paper presents an evaluation of the wave function coefficients for
conformally coupled scalars at both one and two-loop levels at leading order in
the coupling constant, in momentum space. We take cues from time-dependent
interactions in flat spacetim... | hep-th |
String theory in Lorentz-invariant time-like gauge: A theory of closed bosonic string in time-like gauge, related in
Lorentz-invariant way with the world sheet, is considered. Absence of quantum
anomalies in this theory is shown. | hep-th |
In quest of "just" the Standard Model on D-branes at a singularity: In this note we explore the possibility of obtaining gauge bosons and
fermionic spectrum as close as possible to the Standard Model content, by
placing D3-branes at a ZN orbifold-like singularity in the presence of
D7-branes. Indeed, we find that this ... | hep-th |
Worldline Formalism in Snyder Spaces: We study the $\phi_{\star}^4$ model for a scalar field in a linearization of
the Snyder model, using the methods of the Worldline Formalism. Our main result
is a master equation for the 1-loop n-point function. From this we derive the
renormalization of the coupling parameters of t... | hep-th |
A test of the circular Unruh effect using atomic electrons: We propose a test for the circular Unruh effect using certain atoms -
fluorine and oxygen. For these atoms the centripetal acceleration of the outer
shell electrons implies an effective Unruh temperature in the range 1000 - 2000
K. This range of Unruh temperat... | hep-th |
AdS scale separation and the distance conjecture: It has been argued that orientifold vacua with fluxes in type IIA string
theory can achieve moduli stabilisation and arbitrary decoupling between the
AdS and KK scales upon sending certain unconstrained RR-flux quanta to
infinity. In this paper, we find a novel scalar f... | hep-th |
"Integrating in" and Effective Lagrangian for Non-Supersymmetric
Yang-Mills Theory: Recently a non-supersymmetric analog of Veneziano-Yankielowicz (VY) effective
Lagrangian has been proposed and applied for the analysis of the theta
dependence in pure Yang-Mills theory. This effective Lagrangian is similar in
many re... | hep-th |
Holographic electrical and thermal conductivity in strongly coupled
gauge theory with multiple chemical potentials: We study transport coefficients of strongly coupled gauge theory in the
presence of multiple chemical potential which are dual to rotating D3, M2 and
M5 brane. Using the general form of the perturbation... | hep-th |
Adler-Bell-Jackiw anomaly, the Nieh-Yan form, and vacuum polarization: We show from first principles, using explicitly invariant Pauli-Villars
regularization of chiral fermions, that the Nieh-Yan form does contribute to
the Adler-Bell-Jackiw (ABJ) anomaly for spacetimes with generic torsion, and
comment on some of the ... | hep-th |
Vacuum Expectation Values of Products of Chiral Currents in $3+1$
Dimensions: An algebraic rule is presented for computing expectation values of products
of local nonabelian charge operators for fermions coupled to an external vector
potential in $3+1$ space-time dimensions. The vacuum expectation value of a
product ... | hep-th |
Free field representation and form factors of the chiral Gross-Neveu
model: The free field representation of the Zamolodchikov-Faddeev algebra for the
chiral Gross-Neveu model is analysed in detail, and used to construct an
integral representation for form factors of the model. | hep-th |
Towards the n-point one-loop superstring amplitude I: Pure spinors and
superfield kinematics: This is the first installment of a series of three papers in which we
describe a method to determine higher-point correlation functions in one-loop
open-superstring amplitudes from first principles. In this first part, we
ex... | hep-th |
Covariantly Constant Curvature Tensors and D=3, N=4, 5, 8 Chern-Simons
Matter Theories: We construct some examples of D=3, N=4 GW theory and N=5 superconformal
Chern-Simons matter theory by using the covariantly constant curvature of a
quaternionic-Kahler manifold to construct the symplectic 3-algebra in the
theories... | hep-th |
Windings of twisted strings: Twistor string models have been known for more than a decade now but have
come back under the spotlight recently with the advent of the scattering
equation formalism which has greatly generalized the scope of these models. A
striking ubiquitous feature of these models has always been that, ... | hep-th |
Non-Renormalization and Naturalness in a Class of Scalar-Tensor Theories: We study the renormalization of some dimension-4, 7 and 10 operators in a
class of nonlinear scalar-tensor theories. These theories are invariant under:
(a) linear diffeomorphisms which represent an exact symmetry of the full
non-linear action, a... | hep-th |
Quark Condensates in Non-Supersymmetric MQCD: A set of non-supersymmetric minimal area embeddings of an M-theory 5-brane
are considered. The field theories on the surface of the 5-brane have the field
content of N=2 SQCD with fundamental representation matter fields. By suitable
choice of curve parameters the N=2 and N... | hep-th |
Chaos and Scrambling in Quantum Small Worlds: Quantum small-worlds are quantum many-body systems that interpolate between
completely ordered (nearest-neighbour, next-to-nearest-neighbour etc.) and
completely random interactions. As such, they furnish a novel new laboratory to
study quantum systems transitioning between... | hep-th |
Interpolating Between $CP(N-1)$ and $S^{2N-1}$ Target Spaces: Some magnetic phenomena in correlated electron systems were recently shown to
be described in the continuum limit by a class of sigma models which present a
U(1) Hopf fibration over CP(1). In this paper we study a generalization of such
models with a target ... | hep-th |
Unstoppable brane-flux decay of $\overline{\text{D6}}$ branes: We investigate $p$ $\overline{\text{D6}}$ branes inside a flux throat that
carries $K \times M$ D6 charges with $K$ the 3-form flux quantum and $M$ the
Romans mass. We find that within the calculable supergravity regime where $g_s
p$ is large, the $\overlin... | hep-th |
Casimir force due to condensed vortices in a plane: The Casimir force between parallel lines in a theory describing condensed
vortices in a plane is determined. We make use of the relation between a
Chern-Simons-Higgs model and its dualized version, which is expressed in terms
of a dual gauge field and a vortex field. ... | hep-th |
Protected Operators in N=2,4 Supersymmetric Theories: The anomalous dimension of single and multi-trace composite operators of
scalar fields is shown to vanish at all orders of the perturbative series. The
proof hold for theories with N=2 supersymmetry with any number of
hypermultiplets in a generic representation of t... | hep-th |
Current correlators and AdS/CFT away from the conformal point: Using the AdS/CFT correspondence we study vacua of N=4 SYM for which part of
the gauge symmetry is broken by expectation values of scalar fields. A specific
subclass of such vacua can be analyzed with gauged supergravity and the
corresponding domain wall so... | hep-th |
Beyond the WKB approximation in PT-symmetric quantum mechanics: The mergings of energy levels associated with the breaking of PT symmetry in
the model of Bender and Boettcher, and in its generalisation to incorporate a
centrifugal term, are analysed in detail. Even though conventional WKB
techniques fail, it is shown h... | hep-th |
Quantum Inverse Scattering and the Lambda Deformed Principal Chiral
Model: The lambda model is a one parameter deformation of the principal chiral model
that arises when regularizing the non-compactness of a non-abelian T dual in
string theory. It is a current-current deformation of a WZW model that is known
to be in... | hep-th |
Relative entropy of excited states in conformal field theories of
arbitrary dimensions: Extending our previous work, we study the relative entropy between the
reduced density matrices obtained from globally excited states in conformal
field theories of arbitrary dimensions. We find a general formula in the small
subs... | hep-th |
Conformal and Superconformal Mechanics: We investigate the conformal and superconformal properties of a
non-relativistic spinning particle propagating in a curved background coupled
to a magnetic field and with a scalar potential. We derive the conditions on
the couplings for a large class of such systems which are nec... | hep-th |
On the Casimir interaction between two smoothly deformed cylindrical
surfaces: We generalize the derivative expansion (DE) approach to the interaction
between almost-flat smooth surfaces, to the case of surfaces which are
optimally described in cylindrical coordinates. As in the original form of the
DE, the obtained ... | hep-th |
KK Spectroscopy of Type IIB Supergravity on AdS_5 x T^{11}: We give full details for the computation of the Kaluza--Klein mass spectrum
of Type IIB Supergravity on AdS_5 x T^{11}, with T^{11}=SU(2)xSU(2)/U(1), that
has recently lead to both stringent tests and interesting predictions on the
AdS_5/CFT_4 correspondence f... | hep-th |
From Topological to Quantum Entanglement: Entanglement is a special feature of the quantum world that reflects the
existence of subtle, often non-local, correlations between local degrees of
freedom. In topological theories such non-local correlations can be given a
very intuitive interpretation: quantum entanglement o... | hep-th |
Average Effective Potential for the Conformal Factor: In a four dimensional theory of gravity with lagrangian quadratic in
curvature and torsion, we compute the effective action for metrics of the form
$g_{\mu\nu}=\rho^2\delta_{\mu\nu}$, with $\rho$ constant. Using standard
field-theoretic methods we find that one loop... | hep-th |
Charged seven-dimensional spacetimes with spherically symmetric
extra-dimensions: We derive exact solutions of the seven-dimensional Einstein-Maxwell equations
for a spacetime exhibiting Poincare invariance along four-dimensions and
spherical symmetry in the extra-dimensions. Such topology generically arises in
the c... | hep-th |
Non-Abelian discrete gauge symmetries in F-theory: The presence of non-Abelian discrete gauge symmetries in four-dimensional
F-theory compactifications is investigated. Such symmetries are shown to arise
from seven-brane configurations in genuine F-theory settings without a weak
string coupling description. Gauge field... | hep-th |
Asymptotic Quasinormal Frequencies of Brane-Localized Black Hole: The asymptotic quasinormal frequencies of the brane-localized
$(4+n)$-dimensional black hole are computed. Since the induced metric on the
brane is not an exact vacuum solution of the Einstein equation defined on the
brane, the real parts of the quasinor... | hep-th |
Towards Natural Inflation in String Theory: We provide type IIB string embeddings of two axion variants of natural
inflation. We use a combination of RR 2 form axions as the inflaton field and
have its potential generated by non perturbative effects in the superpotential.
Besides giving rise to inflation, the models de... | hep-th |
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