Astrophysical Bose-Einstein condensates and superradiance

Florian Kühnel*, Cornelius Rampf

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

We investigate gravitational analogue models to describe slowly rotating objects (e.g., dark-matter halos, or boson stars) in terms of Bose-Einstein condensates, trapped in their own gravitational potentials. We begin with a modified Gross-Pitaevskii equation, and show that the resulting background equations of motion are stable, as long as the rotational component is treated as a small perturbation. The dynamics of the fluctuations of the velocity potential are effectively governed by the Klein-Gordon equation of an "Eulerian metric," where we derive the latter by the use of a relativistic Lagrangian extrapolation. Superradiant scattering on such objects is studied. We derive conditions for its occurrence and estimate its strength. Our investigations might give an observational handle to phenomenologically constrain Bose-Einstein condensates.

Original languageEnglish
Article number103526
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume90
Issue number10
DOIs
Publication statusPublished - 21 Nov 2014

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