235 citations · 1.4k across the 37 of their papers we have counts for
38 papers
Extremal Chaos
Sandipan Kundu
In maximally chaotic quantum systems, a class of out-of-time-order correlators (OTOCs) saturate the Maldacena-Shenker-Stanford (MSS) bound on chaos. Recently, it has been shown tha…
Subleading Bounds on Chaos
Sandipan Kundu
Chaos, in quantum systems, can be diagnosed by certain out-of-time-order correlators (OTOCs) that obey the chaos bound of Maldacena, Shenker, and Stanford (MSS). We begin by derivi…
Swampland Conditions for Higher Derivative Couplings from CFT
Sandipan Kundu
There are effective field theories that cannot be embedded in any UV complete theory. We consider scalar effective field theories, with and without dynamical gravity, in -dimens…
EFT of 6D SUSY RG Flows
Jonathan J. Heckman, Sandipan Kundu, Hao Y. Zhang
Motivated by its potential use in constraining the structure of 6D renormalization group flows, we determine the low energy dilaton-axion effective field theory of conformal and gl…
RG Flows with Global Symmetry Breaking and Bounds from Chaos
Sandipan Kundu
We discuss general aspects of renormalization group (RG) flows between two conformal fixed points in 4d with a broken continuous global symmetry in the UV. Every such RG flow can b…
Causality Constraints in Large QCD Coupled to Gravity
Jared Kaplan, Sandipan Kundu
Confining gauge theories contain glueballs and mesons with arbitrary spin, and these particles become metastable at large . However, metastable higher spin particles, when coupl…
Closed Strings and Weak Gravity from Higher-Spin Causality
Jared Kaplan, Sandipan Kundu
We combine old and new quantum field theoretic arguments to show that any theory of stable or metastable higher spin particles can be coupled to gravity only when the gravity secto…
A Generalized Nachtmann Theorem in CFT
Sandipan Kundu
Correlators of unitary quantum field theories in Lorentzian signature obey certain analyticity and positivity properties. For interacting unitary CFTs in more than two dimensions,…
Renormalization Group Flows, the -Theorem and Conformal Bootstrap
Sandipan Kundu
Every renormalization group flow in spacetime dimensions can be equivalently described as spectral deformations of a generalized free CFT in spacetime dimensions. This…
A Species or Weak-Gravity Bound for Large Gauge Theories Coupled to Gravity
Jared Kaplan, Sandipan Kundu
Causality constrains the gravitational interactions of massive higher spin particles in both AdS and flat spacetime. We explore the extent to which these constraints apply to compo…
A Bound on Massive Higher Spin Particles
Nima Afkhami-Jeddi, Sandipan Kundu, Amirhossein Tajdini
According to common lore, massive elementary higher spin particles lead to inconsistencies when coupled to gravity. However, this scenario was not completely ruled out by previous…
A Conformal Collider for Holographic CFTs
Nima Afkhami-Jeddi, Sandipan Kundu, Amirhossein Tajdini
We develop a formalism to study the implications of causality on OPE coefficients in conformal field theories with large central charge and a sparse spectrum of higher spin operato…
Bulk Matter and the Boundary Quantum Null Energy Condition
Zuhair U. Khandker, Sandipan Kundu, Daliang Li
We investigate the quantum null energy condition (QNEC) in holographic CFTs, focusing on half-spaces and particular classes of states. We present direct, and in certain cases nonpe…
Shockwaves from the Operator Product Expansion
Nima Afkhami-Jeddi, Thomas Hartman, Sandipan Kundu +1
We clarify and further explore the CFT dual of shockwave geometries in Anti-de Sitter. The shockwave is dual to a CFT state produced by a heavy local operator inserted at a complex…
Physical Effects of the Gravitational -Parameter
Willy Fischler, Sandipan Kundu
We describe the effect of the gravitational -parameter on the behavior of the stretched horizon of a black hole in -dimensions. The gravitational -term is a total deri…
Averaged Null Energy Condition from Causality
Thomas Hartman, Sandipan Kundu, Amirhossein Tajdini
Unitary, Lorentz-invariant quantum field theories in flat spacetime obey microcausality: commutators vanish at spacelike separation. For interacting theories in more than two dimen…
Efficient L1-Norm Principal-Component Analysis via Bit Flipping
Panos P. Markopoulos, Sandipan Kundu, Shubham Chamadia +1
It was shown recently that the L1-norm principal components (L1-PCs) of a real-valued data matrix ( data samples of dimensions) ca…
Einstein gravity 3-point functions from conformal field theory
Nima Afkhami-Jeddi, Thomas Hartman, Sandipan Kundu +1
We study stress tensor correlation functions in four-dimensional conformal field theories with large and a sparse spectrum. Theories in this class are expected to have local ho…
Emergent Horizons and Causal Structures in Holography
Avik Banerjee, Arnab Kundu, Sandipan Kundu
The open string metric arises kinematically in studying fluctuations of open string degrees of freedom on a D-brane. An observer, living on a probe D-brane, can send signals throug…
Aspects of Holographic Entanglement at Finite Temperature and Chemical Potential
Sandipan Kundu, Juan F. Pedraza
We investigate the behavior of entanglement entropy at finite temperature and chemical potential for strongly coupled large-N gauge theories in -dimensions () that are d…
Spread of entanglement for small subsystems in holographic CFTs
Sandipan Kundu, Juan F. Pedraza
We develop an analytic perturbative expansion to study the propagation of entanglement entropy for small subsystems after a global quench, in the context of the AdS/CFT corresponde…
A New Spin on Causality Constraints
Thomas Hartman, Sachin Jain, Sandipan Kundu
Causality in a shockwave state is related to the analytic properties of a four-point correlation function. Extending recent results for scalar probes, we show that this constrains…
Flavour Fields in Steady State: Stress Tensor and Free Energy
Avik Banerjee, Arnab Kundu, Sandipan Kundu
The dynamics of a probe brane in a given gravitational background is governed by the Dirac-Born-Infeld action. The corresponding open string metric arises naturally in studying the…
Membrane Paradigm, Gravitational -Term and Gauge/Gravity Duality
Willy Fischler, Sandipan Kundu
Following the membrane paradigm, we explore the effect of the gravitational -term on the behavior of the stretched horizon of a black hole in (3+1)-dimensions. We reformulate th…