Department of Physics

Indian Institute Of Technology Madras , Chennai

Extremal surfaces, de Sitter entropy and entanglement in ghost systems

Speaker : K Narayan, CMI, Chennai

2019-04-19

Abstract :

We describe connected codim-2 extremal surfaces stretching between the future and past boundaries in the static coordinatization of de Sitter space. These are analogous to rotated versions of certain surfaces in the AdS black hole. The existence of these surfaces via the dS/CFT framework suggests the speculation that dS4 is dual to two copies of ghost-like CFTs in a thermofield-double-type entangled state. In studies of entanglement in ghost systems and "ghost-spin" chains, we show that similar entangled states in two copies of ghost-spin ensembles always have positive norm and positive entanglement.

Key Speaker K Narayan, CMI, Chennai
Guests None
Place S N Bose Hall (HSB 210)
Start Time 3:30 PM
Finish Time 4:30 PM
External Link None