Speaker
Description
The primary motivation behind the analogue gravity programme is the experimental simulation of fundamental features of field quantisation in curved spacetimes, which are typically impossible to detect in real gravitational fields. The analogue gravity idea of William Unruh has led to the first observations of phenomena related to the paradigmatic quantum Hawking effect in the experimentally realisable physical system, Bose-Einstein condensate (BEC), an ultracold quantum gas of interacting bosons by the Steinhauer group. However, the standard paradigm of analogue gravity only focuses on the kinematical aspect of gravity, the dynamics of fields on a given curved background, not the dynamics of the background itself. In the present talk, I will present a recent approach of our group, where we proposed a coupled background and fluctuation model in the number-conserving approach of BEC, thereby enabling a dynamics of the background itself. I will particularly discuss how the background dynamics are governed by an emergent scalar field theory of gravity, and how the renormalised background may affect the Hawking radiation in a black hole analogue model.
