9 papers · 1 filter
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…