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Cosmological inhomogeneities with Bose-Einstein condensate dark matter

Ben Kain1 and Hong Y. Ling2

  • 1Department of Physics, College of The Holy Cross, Worcester, Massachusetts 01610, USA
  • 2Department of Physics and Astronomy, Rowan University, Glassboro, New Jersey 08028, USA

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Phys. Rev. D 85, 023527 – Published 23 January, 2012

DOI: https://doi.org/10.1103/PhysRevD.85.023527

Abstract

We consider the growth of cosmological perturbations to the energy density of dark matter during matter domination when dark matter is a scalar field that has undergone Bose-Einstein condensation. We study these inhomogeneities within the framework of both Newtonian gravity, where the calculation and results are more transparent, and General Relativity. The direction we take is to derive analytical expressions, which can be obtained in the small pressure limit. Throughout we compare our results to those of the standard cosmology, where dark matter is assumed pressureless, using our analytical expressions to showcase precise differences. We find, compared to the standard cosmology, that Bose-Einstein condensate dark matter leads to a scale factor, gravitational potential and density contrast that increase at faster rates.

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Phys. Rev. D 85, 023527– Published 23 January, 2012
  • Received 21 November 2011
Article part of CHORUS

© 2012 American Physical Society

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