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Worldsheet string theory on
Lorenz Eberhardt, Matthias R. Gaberdiel, Sameer Murthy +1
The RNS formalism describing string theory on supported by pure NS-NS flux is in principle straightforward to write down. On…
Super Liouville theory on the torus: bootstrap and the super Virasoro minimal string
Scott Collier, Beatrix Mühlmann, Mukund Rangamani +2
Motivated by applications to low-dimensional worldsheet string constructions, we analyze super Liouville theory on the torus. Specifically, we re-examine the recu…
Thermal two-point functions in SYK and complex-time singularities
Ilija Burić, Chi-Ming Chang, Ivan Gusev +3
We analyze the finite-temperature two-point function of the large- SYK model at intermediate couplings away from the infrared fixed point. Specifically, we examine its analytic…
Exact holographic thermal spectral functions: OPE, non-perturbative corrections, and black hole singularity
Hewei Frederic Jia, Mukund Rangamani
We study analytic properties of thermal spectral functions of holographic CFTs, examining both their (a) exact properties at finite momentum and (b) asymptotics at large momentum.…
Thermal spectral function asymptotics and black hole singularity in holography
Hewei Frederic Jia, Mukund Rangamani
We investigate the analytic structure of thermal spectral function of holographic CFTs, synthesizing recent developments into a set of observations about its asymptotics. Specifica…
Towards the super Virasoro minimal string
Mukund Rangamani, Jianming Zheng
The (bosonic) Virasoro minimal string, which relates worldsheet string theory to a deformation of the JT gravity matrix model, provides an interesting example of a tractable matrix…
Strings and near-extremal black holes in theories with large superconformal symmetry
Sameer Murthy, Mukund Rangamani
We study the one-loop partition function of superstrings in the background. Specifically, we show that…
Records from the S-Matrix Marathon: Schwinger-Keldysh Formalism
Felix M. Haehl, Mukund Rangamani
These notes provide an overview of real-time techniques in quantum field theories and holography. We outline the general rationale and principles underlying the Schwinger-Keldysh f…
Looking at extremal black holes from very far away
Maciej Kolanowski, Donald Marolf, Ilija Rakic +2
Near-extremal black holes are subject to large quantum effects, which modify their low-temperature thermodynamic behavior. Hitherto, these quantum effects were analyzed by separati…
Holographic thermal correlators and quasinormal modes from semiclassical Virasoro blocks
Hewei Frederic Jia, Mukund Rangamani
Motivated by its relevance for thermal correlators in strongly coupled holographic CFTs, we refine and further develop a recent exact analytic approach to black hole perturbation p…
Strings in AdS: one-loop partition function and near-extremal BTZ thermodynamics
Christian Ferko, Sameer Murthy, Mukund Rangamani
We revisit the computation of the string partition function in AdS focussing on the appearance of spacetime (super) symmetries. We show how the asymptotic symmetries of the AdS…
Thermodynamics of the near-extremal Kerr spacetime
Ilija Rakic, Mukund Rangamani, Gustavo J. Turiaci
We examine the thermodynamics of a near-extremal Kerr black hole, and demonstrate that the geometry behaves as an ordinary quantum system with a vanishingly small degeneracy at low…
Anomalous hydrodynamics effective actions from holography
Mukund Rangamani, Julio Virrueta, Shuyan Zhou
We derive an effective action for charged plasmas with an anomalous (abelian) global current charge current using holography. The holographic description is captured by the dynamic…
Holographic thermal correlators: A tale of Fuchsian ODEs and integration contours
R. Loganayagam, Mukund Rangamani, Julio Virrueta
We analyze real-time thermal correlation functions of conserved currents in holographic field theories using the grSK geometry, which provides a contour prescription for their eval…
Holographic open quantum systems: Toy models and analytic properties of thermal correlators
R. Loganayagam, Mukund Rangamani, Julio Virrueta
We present a unified picture of open quantum systems, the theory of a system probing a noisy thermal environment, distilling lessons learnt from previous holographic analyses. Our…
An effective description of charge diffusion and energy transport in a charged plasma from holography
Temple He, R. Loganayagam, Mukund Rangamani +1
We discuss the physics of sound propagation and charge diffusion in a plasma with non-vanishing charge density. Our analysis culminates the program initiated in arXiv:2108.03244 to…
Snowmass white paper: Quantum information in quantum field theory and quantum gravity
Thomas Faulkner, Thomas Hartman, Matthew Headrick +2
We present a summary of recent progress and remaining challenges in applying the methods and ideas of quantum information theory to the study of quantum field theory and quantum gr…
The timbre of Hawking gravitons: an effective description of energy transport from holography
Temple He, R. Loganayagam, Mukund Rangamani +2
Planar black holes in AdS, which are holographically dual to compressible relativistic fluids, have a long-lived phonon mode that captures the physics of attenuated sound propagati…
Disordered vector models: from higher spins to incipient strings
Chi-Ming Chang, Sean Colin-Ellerin, Cheng Peng +1
We present a one-parameter family of large disordered models, with and without supersymmetry, in three spacetime dimensions. They interpolate from the critical large vector…
An effective description of momentum diffusion in a charged plasma from holography
Temple He, R. Loganayagam, Mukund Rangamani +1
We discuss the physics of momentum diffusion in a charged plasma. Following the holographic strategy outlined in arXiv:2012.03999 we construct an open effective field theory for th…
A 3d disordered superconformal fixed point
Chi-Ming Chang, Sean Colin-Ellerin, Cheng Peng +1
We initiate the study of a three dimensional disordered supersymmetric field theory. Specifically, we consider a large Wess-Zumino like model with cubic superpo…
Real-time gravitational replicas: Low dimensional examples
Sean Colin-Ellerin, Xi Dong, Donald Marolf +2
We continue the study of real-time replica wormholes initiated in arXiv:2012.00828. Previously, we had discussed the general principles and had outlined a variational principle for…
Baby Universes and Worldline Field Theories
Eduardo Casali, Donald Marolf, Henry Maxfield +1
The quantum gravity path integral involves a sum over topologies that invites comparisons to worldsheet string theory and to Feynman diagrams of quantum field theory. However, the…
Effective field theory of stochastic diffusion from gravity
Jewel K. Ghosh, R. Loganayagam, Siddharth G. Prabhu +3
Planar black holes in AdS have long-lived quasinormal modes which capture the physics of charge and momentum diffusion in the dual field theory. How should we characterize the effe…