Speaker
Prem Kumar
(Swansea University)
Description
The notion of generalized (von Neumann) entropy of entanglement plays a central role in the semiclassical island mechanism for information retrieval from black holes. In this talk, I will address the question whether there is a generalized Renyi entropy, for general replica number, within the context of gravity coupled to a radiation bath, by examining the nature of replica wormhole contributions in the simplified framework of JT gravity. I will show that the natural generalization, appearing in certain limits, is the generalized modular entropy whose extremization determines island saddle points for Renyi entropies with general replica number.
