Stochastic Dark Matter from Curvature Perturbations
Fuente:
arXiv
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866909305642418176 |
|---|---|
| author | Garani, Raghuveer Redi, Michele Tesi, Andrea |
| author_facet | Garani, Raghuveer Redi, Michele Tesi, Andrea |
| contents | We investigate the production of dark matter from curvature perturbations produced during inflation or in standard cosmology, for example during first order phase transitions. Perturbations break Weyl flatness of the Friedmann-Lemaitre-Robertson-Walker metric, allowing conformally coupled fields -- in particular fermions studied here -- to be produced even in the massless limit. Particle production can be computed by studying the Bogoliubov transformation induced by the stochastic background. For perturbations generated during inflation, we present a closed formula for the resulting abundance of particles that depends solely on the power spectrum of curvature perturbations at the end of inflation. This production mechanism can be dominant especially if the amplitude of curvature perturbations is enhanced for modes that exit the horizon towards the end of inflation. In the simplest scenario, the critical dark matter abundance is reproduced for $M \gtrsim 10^{6}$ GeV. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_15987 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Stochastic Dark Matter from Curvature Perturbations Garani, Raghuveer Redi, Michele Tesi, Andrea High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics We investigate the production of dark matter from curvature perturbations produced during inflation or in standard cosmology, for example during first order phase transitions. Perturbations break Weyl flatness of the Friedmann-Lemaitre-Robertson-Walker metric, allowing conformally coupled fields -- in particular fermions studied here -- to be produced even in the massless limit. Particle production can be computed by studying the Bogoliubov transformation induced by the stochastic background. For perturbations generated during inflation, we present a closed formula for the resulting abundance of particles that depends solely on the power spectrum of curvature perturbations at the end of inflation. This production mechanism can be dominant especially if the amplitude of curvature perturbations is enhanced for modes that exit the horizon towards the end of inflation. In the simplest scenario, the critical dark matter abundance is reproduced for $M \gtrsim 10^{6}$ GeV. |
| title | Stochastic Dark Matter from Curvature Perturbations |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2408.15987 |