Phenomenology of self-interacting dark matter in a matter-dominated universe

被引：0
作者：
Nicolás Bernal
Catarina Cosme
Tommi Tenkanen
机构：
[1] Centro de Investigaciones,Department of Physics and Astronomy
[2] Universidad Antonio Nariño,Astronomy Unit
[3] Departamento de Física e Astronomia,undefined
[4] Faculdade de Ciências da Universidade do Porto and Centro de Física do Porto,undefined
[5] Johns Hopkins University,undefined
[6] Queen Mary University of London,undefined
来源：
The European Physical Journal C | 2019年 / 79卷
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摘要：
We study production of self-interacting dark matter (DM) during an early matter-dominated phase. As a benchmark scenario, we consider a model where the DM consists of singlet scalar particles coupled to the visible Standard Model (SM) sector via the Higgs portal. We consider scenarios where the initial DM abundance is set by either the usual thermal freeze-out or an alternative freeze-in mechanism, where DM was never in thermal equilibrium with the SM sector. For the first time, we take the effect of self-interactions within the hidden sector into account in determining the DM abundance, reminiscent to the Strongly Interacting Massive Particle (SIMP) scenario. In all cases, the number density of DM may change considerably compared to the standard radiation-dominated case, having important observational and experimental ramifications.
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