Linqing Chen

Okinawa Institute of Science and Technology (OIST)

Talks by Linqing Chen

TBA

Linqing Chen Okinawa Institute of Science and Technology (OIST)

Central extension and black hole entropy

Linqing Chen Okinawa Institute of Science and Technology (OIST)
Recent developments on asymptotic symmetries and soft modes have deepened our understanding of black hole entropy and the information paradox. The asymptotic symmetry charge algebra of certain classes of spacetimes could have a nontrivial central extension, which plays a crucial role in black hole physics. The Cardy formula of the asymptotic density of states of the dual CFT has been famously used to reproduce the Bekenstein-Hawking entropy formula.

Central extension in gravity

Linqing Chen Okinawa Institute of Science and Technology (OIST)

The asymptotic symmetry charge algebra of certain class of spacetimes could have a nontrivial central extension, which measures the non-equivariance of the charges of the large gauge transformations. The Cardy formula of the dual CFT has been famously used to derive black hole entropy. However, it remains obscure from the point of view of gravity why such a constant on the gravitational phase space could encode the information about the density of black hole micro-states, and what the degrees of freedom accounting for the black hole entropy truly are.