81 citations · 211 across the 14 of their papers we have counts for
14 papers
York time in JT gravity
Onkar Parrikar, Sunil Kumar Sake
The notion of time in general relativity must arise from an internal clock, i.e., a degree of freedom in the gravitational theory internal to the system that can serve the role of…
A note on Centaur geometry -- probing IR de Sitter spacetime holography
Norihiro Iizuka, Sunil Kumar Sake
We explore a Centaur geometry in JT gravity, which is an asymptotically AdS spacetime but in the IR admits a dS bubble with another AdS geometry in the deep IR. Thus, this geometry…
JT Gravity in de Sitter Space and Its Extensions
Indranil Dey, Kanhu Kishore Nanda, Akashdeep Roy +2
We discuss and extend some aspects pertaining to the canonical quantisation of JT gravity in de Sitter space, including the problem of time and the construction of a Hilbert space.…
Multipartite information in sparse SYK models
Norihiro Iizuka, Arkaprava Mukherjee, Sunil Kumar Sake +1
In quantum field theories that admit gravity dual, specific inequalities involving entanglement entropy between arbitrary disjoint spatial regions hold. An example is the negativit…
The local SYK model and its triple scaling limit
Takanori Anegawa, Norihiro Iizuka, Sunil Kumar Sake
We study a model of fermions with random couplings similar to conventional SYK with number of flavours of fermions, at large . Unlike the conventional SYK model, which has a…
JT Gravity in de Sitter Space and the Problem of Time
Kanhu Kishore Nanda, Sunil Kumar Sake, Sandip P. Trivedi
We discuss the canonical quantisation of JT gravity in de Sitter space, following earlier work by Henneaux, with particular attention to the problem of time. Choosing the dilaton a…
Sparse random matrices and Gaussian ensembles with varying randomness
Takanori Anegawa, Norihiro Iizuka, Arkaprava Mukherjee +2
We study a system of qubits with a random Hamiltonian obtained by drawing coupling constants from Gaussian distributions in various ways. This results in a rich class of system…
Is Action Complexity better for de Sitter space in Jackiw-Teitelboim gravity?
Takanori Anegawa, Norihiro Iizuka, Sunil Kumar Sake +1
Volume complexity in dS remains up to a critical time, after which it suddenly diverges. On the other hand, for the dS solution in JT gravity there is a linear dilat…
A CFT interpretation of cosmological correlation functions in vacua in de-Sitter space
Sachin Jain, Nilay Kundu, Suman Kundu +2
de-Sitter(dS) space allows for a generalized class of vacua, known as vacua, described by some parameters. The Bunch-Davies (BD) vacua is a point in this parameter space. The c…
Aspects of Jackiw-Teitelboim Gravity in Anti-de Sitter and de Sitter spacetime
Upamanyu Moitra, Sunil Kumar Sake, Sandip P. Trivedi
We discuss JT gravity in AdS and dS space in the second order formalism. For the pure dS JT theory without matter, we show that the path integral gives rise in general to the Hartl…
Jackiw-Teitelboim Gravity in the Second Order Formalism
Upamanyu Moitra, Sunil Kumar Sake, Sandip P. Trivedi
We formulate the path integral for Jackiw-Teitelboim gravity in the second order formalism working directly with the metric and the dilaton. We consider the theory both in Anti-de…
Near-Extremal Fluid Mechanics
Upamanyu Moitra, Sunil Kumar Sake, Sandip P. Trivedi
We analyse near-extremal black brane configurations in asymptotically spacetime with the temperature , chemical potential , and three-velocity , varying…
Jackiw-Teitelboim Model Coupled to Conformal Matter in the Semi-Classical Limit
Upamanyu Moitra, Sunil Kumar Sake, Sandip P. Trivedi +1
We analyse the Jackiw-Teitelboim model of 2D gravity coupled to massless free scalar fields in the semi-classical limit. Two systems are studied which essentially differ in the…
Jackiw-Teitelboim Gravity and Rotating Black Holes
Upamanyu Moitra, Sunil Kumar Sake, Sandip P. Trivedi +1
We show that the free energy at low temperatures for near-extremal black holes is correctly obtained from the Jackiw-Teitelboim (JT) model of gravity. Our arguments apply to all bl…