Cannibalism's lingering imprint on the matter power spectrum

Erickcek, Adrienne L.; Ralegankar, Pranjal; Shelton, Jessie

doi:10.1088/1475-7516/2022/01/017

Title: Cannibalism's lingering imprint on the matter power spectrum

Journal Article · 09 January 2022 · Journal of Cosmology and Astroparticle Physics

DOI: https://doi.org/10.1088/1475-7516/2022/01/017 · OSTI ID:1979350

Erickcek, Adrienne L. ^[1]; Ralegankar, Pranjal ^[2]; Shelton, Jessie ^[2]

University of North Carolina, Chapel Hill, NC (United States); Univ. of Illinois at Urbana-Champaign, IL (United States)
University of Illinois at Urbana-Champaign, IL (United States)

The early universe may have contained internally thermalized dark sectors that were decoupled from the Standard Model. In such scenarios, the relic dark thermal bath, composed of the lightest particle in the dark sector, can give rise to an epoch of early matter domination prior to Big Bang Nucleosynthesis, which has a potentially observable impact on the smallest dark matter structures. This lightest dark particle can easily and generically have number-changing self-interactions that give rise to “cannibal” behavior. We consider cosmologies where an initially sub-dominant cannibal species comes to temporarily drive the expansion of the universe, and we provide a simple map between the particle properties of the cannibal species and the key features of the enhanced dark matter perturbation growth in such cosmologies. Finally, we further demonstrate that cannibal self-interactions can determine the small-scale cutoff in the matter power spectrum even when the cannibal self-interactions freeze out prior to cannibal domination.

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Research Organization:: University of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: SC0017840

OSTI ID:: 1979350

Journal Information:: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 01 Vol. 2022; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Cannibalism's lingering imprint on the matter power spectrum

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