Kim, Seyong; Laine, M. (2023). Langevin simulation of dark matter kinetic equilibration. Journal of cosmology and astroparticle physics, 2023(05), 003. Institute of Physics Publishing IOP 10.1088/1475-7516/2023/05/003
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Recently it has been questioned, notably in the context of the scalar singlet dark matter model with mφ ≃ 60 GeV, how efficiently kinetic equilibrium is maintained if freeze-out dynamics is pushed down to low temperatures by resonant effects. We outline how Langevin simulations can be employed for addressing the non-equilibrium momentum distribution of non-relativistic particles in a cosmological background. For a scalar singlet mass mφ ≃ 60 GeV, these simulations suggest that kinetic equilibrium is a good approximation down to T ∼ 1 GeV, with the deviation first manifesting itself as a red-tilted spectrum. This reduces the annihilation cross section, confirming findings from other methods that a somewhat larger (< 20%) coupling than in equilibrium is needed for obtaining the correct abundance.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Institute of Theoretical Physics 10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC) |
UniBE Contributor: |
Laine, Mikko Sakari |
Subjects: |
500 Science > 530 Physics |
ISSN: |
1475-7516 |
Publisher: |
Institute of Physics Publishing IOP |
Language: |
English |
Submitter: |
Franziska Stämpfli |
Date Deposited: |
01 Dec 2023 15:06 |
Last Modified: |
03 Dec 2023 03:03 |
Publisher DOI: |
10.1088/1475-7516/2023/05/003 |
BORIS DOI: |
10.48350/189688 |
URI: |
https://boris.unibe.ch/id/eprint/189688 |
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