News & Events

Fluctuation-Dissipation and Area Quantisation in Black Hole Membranes

Friday, November 25, 2016 - 14:00
SPS Seminar Room
Dr Swastik Bhattacharya
IISER Trivandrum

It has been known for a long time that the event horizon of a stationary black hole in Einstein's theory behaves like a viscous fluid. Taking the Horizon-fluid as a real physical construct, here we show how to construct a Theory of Fluctuations for it. Using a Fluctuation-Dissipation analysis, we show how to compute the Coefficient of Bulk Viscosity for the Horizon-fluid. We find that the value of the coefficient matches exactly with that given by Einstein's theory provided the excitations of the horizon fluid has a certain mass gap. This mass gap naturally gives rise to the quantisation of the black hole area or entropy. The value of the area quantum turns out to be the same as that conjectured by Bekenstein(1974). 

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