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Cosmological simulations of a momentum coupling between dark matter and quintessence.
- Source :
-
Monthly Notices of the Royal Astronomical Society . Dec2023, Vol. 526 Issue 2, p1904-1922. 19p. - Publication Year :
- 2023
-
Abstract
- Dark energy is frequently modelled as an additional dynamical scalar field component in the Universe, referred to as 'quintessence', which drives the late-time acceleration. Furthermore, the quintessence field may be coupled to dark matter and/or baryons, leading to a fifth force. In this paper, we explore the consequences for non-linear cosmological structure formation arising from a momentum coupling between the quintessence field and dark matter only. The coupling leads to a modified Euler equation, which we implement in an N -body cosmological simulation. We then analyse the effects of the coupling on the non-linear power spectrum and the properties of the dark matter haloes. We find that, for certain quintessence potentials, a positive coupling can lead to significantly reduced structure on small scales and somewhat enhanced structure on large scales, as well as reduced halo density profiles and increased velocity dispersions. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 526
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 173152123
- Full Text :
- https://doi.org/10.1093/mnras/stad2739