1. Growth of linear perturbations in a universe with superfluid dark matter
- Author
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Sayantani Bera, David F. Mota, and Shreya Banerjee
- Subjects
Physics ,Work (thermodynamics) ,Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,010308 nuclear & particles physics ,media_common.quotation_subject ,Dark matter ,Linear regime ,FOS: Physical sciences ,Astronomy and Astrophysics ,Model parameters ,General Relativity and Quantum Cosmology (gr-qc) ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,Galaxy ,Universe ,General Relativity and Quantum Cosmology ,Superfluidity ,Theoretical physics ,0103 physical sciences ,Linear growth ,media_common ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
The Lambda-Cold Dark Matter (LCDM) 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 (2015) proposed a new theory involving interacting superfluid dark matter with three model parameters, 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 LCDM, and quite rapidly when the DM-baryon interactions are strong., Comment: 16 pages, 6 figures
- Published
- 2023