Growth of linear perturbations in a universe with superfluid dark matter

Shreya Banerjee, Sayantani Bera, David F. Mota

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The Lambda-Cold Dark Matter (ΛCDM) model agrees with most of the cosmological observations, but has some hindrances from observed data at smaller scales such as galaxies. Recently, Berezhiani and Khoury proposed a new theory involving interacting superfluid dark matter with three model parameters in [1], which explains galactic dynamics with great accuracy. In the present work, we study the cosmological behaviour of this model in the linear regime of cosmological perturbations. In particular, we compute both analytically and numerically the matter linear growth factor and obtain new bounds for the model parameters which are significantly stronger than previously found. These new constraints come from the fact that structures within the superfluid dark matter framework grow quicker than in ΛCDM, and quite rapidly when the DM-baryon interactions are strong.

Original languageEnglish
Article number034
JournalJournal of Cosmology and Astroparticle Physics
Volume2020
Issue number7
DOIs
StatePublished - 1 Jul 2020

Keywords

  • Dark matter theory
  • Power spectrum
  • Rotation curves of galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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