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Quantum Gravity from Gluing Consistency: AdS/CFT to Spin-Foams
Chethan Krishnan
We argue that BF theory with gauge group provides a SymTFT ''skeleton'' for building AdS/CFT pairs via gluing consistency as the bootstrap principle, loosel…
Building a Quantum Black Hole Microstate: A Bulk Path Integral for a Heavy Virasoro Primary
Chethan Krishnan, Rajdeep Mitra
Consider level- Chern-Simons theory on a semi-infinite solid cylinder, with a Wilson line in the unitary principal continuous series inserted along the…
Wilson Towers as Local Bulk Fields
Vishal Gayari, Chethan Krishnan
Multi-winding Wilson loops (``Wilson spools'') in 2+1-dimensional gravity can reproduce one-loop partition functions of local free fields in the bulk. Bulk free fields have a secon…
Geodesics from Quantum Field Theory: A Case Study in AdS
Vaibhav Burman, Chethan Krishnan, Livesh Parajuli
Localized one-particle states of a quantum field theory--whether in flat space or on a curved background--are expected to exhibit geodesic motion in an appropriate semiclassical re…
Holography, Brick Wall and a Little Hierarchy Problem
Vishal Gayari, Chethan Krishnan, Pradipta S. Pathak
We propose a heuristic for the brick wall in AdS/CFT: the location where a boundary mode's local bulk energy reaches a (Planckian) UV cut-off. This accomplishes two things: (a) the…
Holography with an Inner Boundary: A Smooth Horizon as a Sum over Horizonless States
Chethan Krishnan, Pradipta S. Pathak
The (holomorphic) partition function of the Euclidean BTZ black hole with boundary modulus , is the -image of the Virasoro vacuum character, . This object…
Virasoro Blocks and Trouble at the Euclidean Horizon
Aaditya Datar, Chethan Krishnan
In the semi-classical () limit, 4-point HLLH correlators in 2D CFTs exhibit periodic Euclidean singularities. Periodic singularities in Euclidean time are a g…
An Analytic Zeta Function Ramp at the Black Hole Thouless Time
Pallab Basu, Suman Das, Chethan Krishnan
Black hole normal modes have intriguing connections to logarithmic spectra, and the spectral form factor (SFF) of is the mod square of the Riemann zeta function (RZF…
A Central Charge for sub-AdS Holography
Abir Ghosh, Chethan Krishnan, Adinath Mahalingam
We synthesize and sharpen various observations about sub-AdS holography in the literature to associate a central charge to sub-AdS scales of AdS x geometries. A key ingredient…
Holomorphic Factorization at the Quantum Horizon
Chethan Krishnan, Pradipta S. Pathak
We identify a horizon-skimming limit under which wave equations around large classes of black holes allow a determination of their low-lying (quasi-)degenerate normal modes. Buildi…
A Bottom-Up Approach to Black Hole Microstates
Vaibhav Burman, Chethan Krishnan
In arXiv:2312.14108, we argued that a sliver at the black hole mass in the Hilbert space of a quantum field theory on an AdS black hole with a stretched horizon, has many desirable…
Young Black Holes Have Smooth Horizons: A Swampland Argument
Chethan Krishnan, Ranjini Mondol
It has been suggested that black hole microstates in string theory may have "no interiors". The arguments of arXiv:2312.14108 suggest that even if this were the case, conventional…
Normal Modes of the Stretched Horizon: A Bulk Mechanism for Black Hole Microstate Level Spacing
Chethan Krishnan, Pradipta S. Pathak
In 1984, 't Hooft famously used a brickwall (aka stretched horizon) to compute black hole entropy up to a numerical pre-factor. This calculation is sometimes interpreted as due to…
A Smooth Horizon without a Smooth Horizon
Vaibhav Burman, Suchetan Das, Chethan Krishnan
Recent observations on type III algebras in AdS/CFT raise the possibility that smoothness of the black hole horizon is an emergent feature of the large- limit. In this paper, we…
A Holographic Entanglement Entropy at Spi
Abir Ghosh, Chethan Krishnan
Defining finite entanglement entropy for a subregion in quantum field theory requires the introduction of two logically independent scales: an IR scale that controls the size of th…
State-independent Black Hole Interiors from the Crossed Product
Chethan Krishnan, Vyshnav Mohan
Opinion is divided about the nature of state dependence in the black hole interior. Some argue that it is a necessary feature, while others argue it is a bug. In this paper, we con…