Analogue gravitational phenomena in Bose-Einstein condensates

TL;DR

This paper explores how Bose-Einstein condensates can simulate gravitational phenomena, providing experimental platforms for testing quantum field theory in curved spacetime, studying black hole analogues, and investigating quantum gravity concepts.

Contribution

It presents new results on analogue models of gravity in Bose-Einstein condensates, including Hawking-like radiation, black hole laser effects, and instability of warp drives, advancing experimental and theoretical understanding.

Findings

Robust Hawking-like particle creation in single black hole horizon flows

Development of black hole laser effects in condensates with two horizons

Instability of warp drive spacetimes in analogue models

Abstract

Analogue gravity is based on the simple observation that perturbations propagating in several physical systems can be described by a quantum field theory in a curved spacetime. While phenomena like Hawking radiation are hardly detectable in astrophysical black holes, these effects may be experimentally tested in analogue systems. In this Thesis, focusing on Bose-Einstein condensates, we present our recent results about analogue models of gravity from three main perspectives: as laboratory tests of quantum field theory in curved spacetime, for the techniques that they provide to address various issues in general relativity, and as toy models of quantum gravity. The robustness of Hawking-like particle creation is investigated in flows with a single black hole horizon. Furthermore, we find that condensates with two (white and black) horizons develop a dynamical instability known in general relativity as black hole laser effect. Using techniques borrowed from analogue gravity, we also show that warp drives, which are general relativistic spacetimes allowing faster-than-light travel, are unstable. Finally, the cosmological constant issue is investigated from an analogue gravity perspective and relativistic Bose-Einstein condensates are proposed as new analogue systems with novel interesting properties.