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19 papers · 2 filters
Cosmic Hysteresis
Sayantan Choudhury, Shreya Banerjee
Cosmological hysteresis, has interesting and vivid implications in the scenario of a cyclic bouncy universe. This, purely thermodynamical in nature, is caused by the asymmetry in t…
Thermalization in 2D critical quench and UV/IR mixing
Gautam Mandal, Shruti Paranjape, Nilakash Sorokhaibam
We consider quantum quenches in models of free scalars and fermions with a generic time-dependent mass that goes from to zero. We prove that, as anticipated in MSS \ci…
Aspects of Entanglement Entropy for Gauge Theories
Ronak M Soni, Sandip P. Trivedi
A definition for the entanglement entropy in a gauge theory was given recently in arXiv:1501.02593. Working on a spatial lattice, it involves embedding the physical state in an ext…
COSMOS--GTachyon from String Theory
Sayantan Choudhury, Sudhakar Panda
In this article, our prime objective is to study the inflationary paradigm from generalized tachyon (GTachyon) living on the world volume of a non-BPS string theory. The tachyon ac…
A Charged Membrane Paradigm at Large D
Sayantani Bhattacharyya, Mangesh Mandlik, Shiraz Minwalla +1
We study the effective dynamics of black hole horizons in Einstein-Maxwell theory in a large number of spacetime dimensions . We demonstrate that horizon dynamics may be recast…
Effective Field Theory of Dark Matter from membrane inflationary paradigm
Sayantan Choudhury, Arnab Dasgupta
In this article, we have studied the cosmological and particle physics constraints on dark matter relic abundance from effective field theory of inflation using tensor-to-scalar ra…
Dynamics of Perturbations in Double Field Theory & Non-Relativistic String Theory
Sung Moon Ko, Charles Melby-Thompson, Rene Meyer +1
Double Field Theory provides a geometric framework capable of describing string theory backgrounds that cannot be understood purely in terms of Riemannian geometry -- not only glob…
Thermodynamics of QCD from Sakai-Sugimoto Model
Hiroshi Isono, Gautam Mandal, Takeshi Morita
Till date, the only consistent description of the deconfinement phase of the Sakai-Sugimoto model appears to be provided by the analysis of [1] (arXiv:1107.4048). The current versi…
Ward Identities for Scale and Special Conformal Transformations in Inflation
Nilay Kundu, Ashish Shukla, Sandip P. Trivedi
We derive the general Ward identities for scale and special conformal transformations in theories of single field inflation. Our analysis is model independent and based on symmetry…
Chern Simons Bosonization along RG Flows
Shiraz Minwalla, Shuichi Yokoyama
It has previously been conjectured that the theory of free fundamental scalars minimally coupled to a Chern Simons gauge field is dual to the theory of critical fundamental fermion…
Hysteresis in the Sky
Sayantan Choudhury, Shreya Banerjee
Hysteresis is a phenomenon occurring naturally in several magnetic and electric materials in condensed matter physics. When applied to cosmology, aka cosmological hysteresis, has i…
The Shear Viscosity in Anisotropic Phases
Sachin Jain, Rickmoy Samanta, Sandip P. Trivedi
We construct anisotropic black brane solutions and analyse the behaviour of some of their metric perturbations. These solutions correspond to field theory duals in which rotational…
Unitarity, Crossing Symmetry and Duality in the scattering of Susy Matter Chern-Simons theories
Karthik Inbasekar, Sachin Jain, Subhajit Mazumdar +3
We study the most general renormalizable Chern-Simons gauge theory coupled to a single (generically massive) fundamental matter multiplet. At leading order in t…
A membrane paradigm at large D
Sayantani Bhattacharyya, Anandita De, Shiraz Minwalla +2
We study invariant solutions of the classical vacuum Einstein equations in dimensions. In the limit with held fixed we construct a class of sol…
Comments on the Necessity and Implications of State-Dependence in the Black Hole Interior
Kyriakos Papadodimas, Suvrat Raju
We revisit the "state-dependence" of the map that we proposed recently between bulk operators in the interior of a large AdS black hole and operators in the boundary CFT. By refini…
Fermion localization in higher curvature spacetime
Sayantan Choudhury, Joydip Mitra, Soumitra SenGupta
Fermion localization in a braneworld model in presence of dilaton coupled higher curvature Gauss-Bonnet bulk gravity is discussed. It is shown that the lowest mode of left handed f…
Local Operators in the Eternal Black Hole
Kyriakos Papadodimas, Suvrat Raju
We show that, in the AdS/CFT correspondence, states obtained by Hamiltonian evolution of the thermofield doubled state are also dual to an eternal black hole geometry, which is glu…
Thermalization with chemical potentials, and higher spin black holes
Gautam Mandal, Ritam Sinha, Nilakash Sorokhaibam
We study the long time behaviour of local observables following a quantum quench in 1+1 dimensional conformal field theories possessing additional conserved charges besides the ene…
On The Entanglement Entropy For Gauge Theories
Sudip Ghosh, Ronak M. Soni, Sandip P. Trivedi
We propose a definition for the entanglement entropy of a gauge theory on a spatial lattice. Our definition applies to any subset of links in the lattice, and is valid for both Abe…