Talk detail

Participant	Majumdar, Parthasarathi
Institution	RKM Vivekananda University - G T Road - Belur - West Bengal - India

Session	BH5	Accepted		Order	Time
Talk	Oral abstract	Title	Themal Stability and Quasi-stability of Quantum Black Holes
Coauthors
Abstract	Using a general quantum gravity approach with a few inputs from loop quantum gravity, thermal stability criteria are derived for quantum horizons without any reference to a classical metric. General classical charged, rotating black hole metrics are then employed as fiducials to predict their thermal stability, based on our criteria. It is shown that for asymptotically flat black holes, contrary to conventional wisdom, there exist in parameter space very narrow regions where several, though not all, of the criteria are actually satisfied. These regions of `quasi-stability' have not appeared earlier in the literature on semi-classical black hole thermodynamics.
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Session	BH7	Accepted		Order	Time
Talk	Oral abstract	Title	Lense-Thirring Precession in Draining Sink Analogue Black Holes
Coauthors
Abstract	We report an incipient exploration of the Lense-Thirring precession effect in a rotating acoustic analogue black hole spacetime. An exact formula is deduced for the precession frequency of a gyroscope due to inertial frame dragging, close to the ergosphere of a ‘Draining Bathtub’ acoustic spacetime which has been studied extensively for acoustic Hawking radiation of phonons and also for ‘superresonance’. The formula is verified by embedding the two dimensional spatial (acoustic) geometry into a three dimensional one where the similarity with standard Lense-Thirring precession results within a strong gravity framework is well known. Prospects of experimental detection of this new ‘fixed-metric’ effect in acoustic geometries, are briefly discussed.
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