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Deciphering the archaeological record: Cosmological imprints of nonminimal dark sectors

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Title
Deciphering the archaeological record: Cosmological imprints of nonminimal dark sectors
Author(s)
Keith R. Dienes; Fei Huang; Jeff Kost; Shufang Su; Brooks Thomas
Subject
SPECTRAL DISTORTIONS, ; PARAMETER-ESTIMATION, ; MATTER, ; MODELS, ; THERMALIZATION, ; CONSTRAINTS, ; UNIVERSE
Publication Date
2020-06
Journal
PHYSICAL REVIEW D, v.101, no.12, pp.123511
Publisher
AMER PHYSICAL SOC
Abstract
© 2020 American Physical Society. Many proposals for physics beyond the Standard Model give rise to a dark sector containing many degrees of freedom. In this work, we explore the cosmological implications of the nontrivial dynamics which may arise within such dark sectors, focusing on decay processes which take place entirely among the dark constituents. First, we demonstrate that such decays can leave dramatic imprints on the resulting dark-matter phase-space distribution. In particular, this distribution need not be thermal - it can even be multimodal, exhibiting a nontrivial pattern of peaks and troughs as a function of momentum. We then proceed to show how these features can induce modifications to the matter power spectrum. Finally, we assess the extent to which one can approach the archaeological "inverse" problem of deciphering the properties of an underlying dark sector from the matter power spectrum. Indeed, one of the main results of this paper is a remarkably simple conjectured analytic expression which permits the reconstruction of many of the important features of the dark-matter phase-space distribution directly from the matter power spectrum. Our results therefore provide an interesting toolbox of methods for learning about, and potentially constraining, the features of nonminimal dark sectors and their dynamics in the early universe
URI
https://pr.ibs.re.kr/handle/8788114/7816
DOI
10.1103/PhysRevD.101.123511
ISSN
2470-0010
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > 1. Journal Papers (저널논문)
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