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York time in JT gravity
Onkar Parrikar, Sunil Kumar Sake
The paper studies York time as an internal clock in two‑dimensional JT gravity, calculating the Hartle‑Hawking wavefunction as a function of this time and showing it satisfies a Sc…
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.…
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…
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…