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21 papers · 2 filters
Circular Wilson loops in defect Conformal Field Theory
Jeremias Aguilera-Damia, Diego H. Correa, Victor I. Giraldo-Rivera
We study a D3-D5 system dual to a conformal field theory with a codimension-one defect that separates regions where the ranks of the gauge groups differ by . With the help of th…
Quantum Chaos and Holographic Tensor Models
Chethan Krishnan, Sambuddha Sanyal, P. N. Bala Subramanian
A class of tensor models were recently outlined as potentially calculable examples of holography: their perturbative large- behavior is similar to the Sachdev-Ye-Kitaev (SYK) mo…
Currents and Radiation from the large Black Hole Membrane
Sayantani Bhattacharyya, Anup Kumar Mandal, Mangesh Mandlik +4
It has recently been demonstrated that black hole dynamics in a large number of dimensions reduces to the dynamics of a codimension one membrane propagating in flat space. In t…
The Breakdown of String Perturbation Theory for Many External Particles
Sudip Ghosh, Suvrat Raju
We consider massless string scattering amplitudes in a limit where the number of external particles becomes very large, while the energy of each particle remains small. Using the g…
Sine-Gordon Theory : Entanglement entropy and holography
Pinaki Banerjee, Atanu Bhatta, B. Sathiapalan
We compute change in entanglement entropy for a single interval in dimensional sine-Gordon model perturbatively in the coupling. The sine-Gordon perturbation can be thought o…
Schwinger-Keldysh formalism II: Thermal equivariant cohomology
Felix M. Haehl, R. Loganayagam, Mukund Rangamani
Causally ordered correlation functions of local operators in near-thermal quantum systems computed using the Schwinger-Keldysh formalism obey a set of Ward identities. These can be…
Schwinger-Keldysh formalism I: BRST symmetries and superspace
Felix M. Haehl, R. Loganayagam, Mukund Rangamani
We review the Schwinger-Keldysh, or in-in, formalism for studying quantum dynamics of systems out-of-equilibrium. The main motivation is to rephrase well known facts in the subject…
Unstable `black branes' from scaled membranes at large
Yogesh Dandekar, Subhajit Mazumdar, Shiraz Minwalla +1
It has recently been demonstrated that the dynamics of black holes at large can be recast as a set of non gravitational membrane equations. These membrane equations admit a sim…
Revisiting AdS/CFT at a finite radial cut-off
Gautam Mandal, Pranjal Nayak
We revisit AdS/CFT at finite radial cut-off, specifically in the context of double trace perturbations, = , with arbit…
Entanglement Entropy in (3+1)-d Free Gauge Theory
Ronak M Soni, Sandip P. Trivedi
We consider the entanglement entropy for a free theory in dimensions in the extended Hilbert space definition. By taking the continuum limit carefully we obtain a re…
Chaotic dynamics of strings in charged black hole backgrounds
Pallab Basu, Pankaj Chaturvedi, Prasant Samantray
We study the motion of a string in the background of Reissner-Nordstrom black hole, in both AdS as well as asymptotically flat spacetimes. We describe the phase space of this dynam…
Symmetry Constraints in Inflation, -vacua, and the Three Point Function
Ashish Shukla, Sandip P. Trivedi, V. Vishal
The Ward identities for conformal symmetries in single field models of inflation are studied in more detail in momentum space. For a class of generalized single field models, where…
The large D black hole Membrane Paradigm at first subleading order
Yogesh Dandekar, Anandita De, Subhajit Mazumdar +2
In the large D limit, and under certain circumstances, it has recently been demonstrated that black hole dynamics in asymptotically flat spacetime reduces to the dynamics of a non…
S-duality invariant perturbation theory improved by holography
Abhishek Chowdhury, Masazumi Honda, Somyadip Thakur
We study anomalous dimensions of unprotected low twist operators in the four-dimensional supersymmetric Yang-Mills theory. We construct a class of interpola…
Bell violation in the Sky
Sayantan Choudhury, Sudhakar Panda, Rajeev Singh
In this work, we have studied the possibility of setting up Bell's inequality violating experiment in the context of cosmology, based on the basic principles of quantum mechanics.…
Glueball Spectra from a Matrix Model of Pure Yang-Mills Theory
Nirmalendu Acharyya, A. P. Balachandran, Mahul Pandey +2
We present variational estimates for the low-lying energies of a simple matrix model that approximates Yang-Mills theory on a three-sphere of radius . By fixing the grou…
A Matrix Model for WZW
Nick Dorey, David Tong, Carl Turner
We study a U(N) gauged matrix quantum mechanics which, in the large N limit, is closely related to the chiral WZW conformal field theory. This manifests itself in two ways. First,…
Smooth Causal Patches for AdS Black Holes
Suvrat Raju
We review the paradox of low energy excitations about an AdS black hole. An appropriately chosen unitary operator in the boundary theory can create a locally strong excitation near…
A toy model of black hole complementarity
Souvik Banerjee, Jan-Willem Bryan, Kyriakos Papadodimas +1
We consider the algebra of simple operators defined in a time band in a CFT with a holographic dual. When the band is smaller than the light crossing time of AdS, an entire causal…
Cosmological hysteresis in cyclic universe from membrane paradigm
Sayantan Choudhury, Shreya Banerjee
Cosmological hysteresis is a purely thermodynamical phenomenon caused by the gradient in pressure, hence the characteristic equation of state during the expansion and contraction p…
Higher-point conformal blocks and entanglement entropy in heavy states
Pinaki Banerjee, Shouvik Datta, Ritam Sinha
We consider conformal blocks of two heavy operators and an arbitrary number of light operators in a (1+1)-d CFT with large central charge. Using the monodromy method, these higher-…