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Astrophysical Bose-Einstein condensates and superradiance
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
2014 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 90, no 10, 103526- p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2014. Vol. 90, no 10, 103526- p.
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Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-111381DOI: 10.1103/PhysRevD.90.103526ISI: 000345743800003OAI: oai:DiVA.org:su-111381DiVA: diva2:776266
Note

AuthorCount:2;

Available from: 2015-01-07 Created: 2015-01-02 Last updated: 2017-12-05Bibliographically approved

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