2020
DOI: 10.1103/physrevd.102.035017
|View full text |Cite
|
Sign up to set email alerts
|

Dark matter abundance from the sequential freeze-in mechanism

Abstract: We present a thorough analysis of the sequential freeze-in mechanism for dark matter production in the early Universe. In this mechanism the dark matter relic density results from pair annihilation of mediator particles which are themselves produced by thermal collisions of standard model particles. Below some critical value of the mediator coupling to standard model fields, this sequential channel dominates over the usual freeze-in where dark matter is directly produced from thermal collisions, even when the … Show more

Help me understand this report
View preprint versions

Search citation statements

Order By: Relevance

Paper Sections

Select...
2
2
1

Citation Types

0
21
0

Year Published

2021
2021
2023
2023

Publication Types

Select...
6
1

Relationship

0
7

Authors

Journals

citations
Cited by 28 publications
(23 citation statements)
references
References 72 publications
0
21
0
Order By: Relevance
“…The integral can be computed analytically if we set g * g * s const so that the number of relativistic degrees of freedom do not vary during the DM production era (see refs. [23,108] for relaxing this assumption). We set them at the time when freeze-in is mostly efficient, namely when T m B (x 1), and we find…”
Section: Jhep05(2021)234mentioning
confidence: 99%
“…The integral can be computed analytically if we set g * g * s const so that the number of relativistic degrees of freedom do not vary during the DM production era (see refs. [23,108] for relaxing this assumption). We set them at the time when freeze-in is mostly efficient, namely when T m B (x 1), and we find…”
Section: Jhep05(2021)234mentioning
confidence: 99%
“…When φ is in the chemical equilibrium with the SM plasma the semi-production mechanism leads to the enhanced values of the coupling compared to the typical freeze-in, but as illustrated in section 2, the resulting cross sections are still somewhat below the sensitivity of the near-future indirect searches. However, combined with the idea of the sequential freeze-in [30], i.e. simply when φ is coupled very weakly to the SM states such that it also undergoes the freeze-in, the resulting signals can be much stronger.…”
Section: Scan Results and Phenomenologymentioning
confidence: 99%
“…, since the dark sector is never populated densely enough for the backreaction processes, nor for the actual momentum distribution of DM, to have any impact. Therefore, only the 0-th moment of the equation (4.1) is usually considered (but see [30] for an exception). In the case of semi-production, however, χ is also present in the initial state, leading to a dependence of the production rate on its distribution function.…”
Section: Boltzmann Equationsmentioning
confidence: 99%
“…We will also neglect spin statistics effects by taking (1 ± f out ) = 1, see e.g. [30,31,33] for some complementary studies.…”
Section: Boltzmann Equationsmentioning
confidence: 99%