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Open AccessArticle

Coupled DM Heating in SCDEW Cosmologies

by Silvio Bonometto 1,*,† and Roberto Mainini 2,†
1
Istituto Nazionale di Astrofisica (INAF), Trieste Astronomical Observatory, Via Tiepolo 11, 34143 Trieste, Italy
2
Dipartimento di Fisica G.Occhialini, Universitá Milano-Bicocca, Piazza della Scienza 3, 20116 Milano, Italy
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Entropy 2017, 19(8), 398; https://doi.org/10.3390/e19080398
Received: 20 July 2017 / Revised: 27 July 2017 / Accepted: 28 July 2017 / Published: 2 August 2017
(This article belongs to the Special Issue Dark Energy)
Strongly-Coupled Dark Energy plus Warm dark matter (SCDEW) cosmologies admit the stationary presence of ∼1% of coupled-DM and DE, since inflationary reheating. Coupled-DM fluctuations therefore grow up to non-linearity even in the early radiative expansion. Such early non-linear stages are modelized here through the evolution of a top-hat density enhancement, reaching an early virial balance when the coupled-DM density contrast is just 25–26, and the DM density enhancement is ∼10 % of the total density. During the time needed to settle in virial equilibrium, the virial balance conditions, however, continue to modify, so that “virialized” lumps undergo a complete evaporation. Here, we outline that DM particles processed by overdensities preserve a fraction of their virial momentum. Although fully non-relativistic, the resulting velocities (moderately) affect the fluctuation dynamics over greater scales, entering the horizon later on. View Full-Text
Keywords: cosmology; dark matter; dark energy; non-linear fluctuation dynamics cosmology; dark matter; dark energy; non-linear fluctuation dynamics
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Bonometto, S.; Mainini, R. Coupled DM Heating in SCDEW Cosmologies. Entropy 2017, 19, 398.

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