Real scalar dark matter : relativistic treatment

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http://hdl.handle.net/10138/305500

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Arcadi , G , Lebedev , O , Pokorski , S & Toma , T 2019 , ' Real scalar dark matter : relativistic treatment ' , Journal of High Energy Physics , vol. 2019 , no. 8 , 050 . https://doi.org/10.1007/JHEP08(2019)050

Title: Real scalar dark matter : relativistic treatment
Author: Arcadi, Giorgio; Lebedev, Oleg; Pokorski, Stefan; Toma, Takashi
Contributor: University of Helsinki, Department of Physics
Date: 2019-08-08
Language: eng
Number of pages: 26
Belongs to series: Journal of High Energy Physics
ISSN: 1029-8479
URI: http://hdl.handle.net/10138/305500
Abstract: A stable real scalar provides one of the simplest possibilities to account for dark matter. We consider the regime where its coupling to the Standard Model fields is negligibly small. Due to self-coupling, the scalar field can reach thermal or at least kinetic equilibrium, in which case the system is characterized by its temperature and effective chemical potential. We perform a fully relativistic analysis of dark matter evolution, thermalization conditions and different freeze-out regimes, including the chemical potential effects. To this end, we derive a relativistic Bose-Einstein analog of the Gelmini-Gondolo formula for a thermal averaged cross section. Finally, we perform a comprehensive parameter space analysis to determine regions consistent with observational constraints. Dark matter can be both warm and cold in this model.
Subject: Beyond Standard Model
Cosmology of Theories beyond the SM
114 Physical sciences
115 Astronomy, Space science
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