Constraints on Asymmetric Dark Matter Self Annihilation Cross Sections
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866918012259401728 |
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| author | Li, Qiquan Iminniyaz, Hoernisa Liu, Fangyu |
| author_facet | Li, Qiquan Iminniyaz, Hoernisa Liu, Fangyu |
| contents | We investigate the evolution of the relic density for asymmetric dark matter incorporating self annihilation processes in both the shear-dominated universe and Gauss-Bonnet braneworld. Under the same conditions where the ratio of final asymmetry to the initial asymmetry $ R \equiv Δ_{-\infty}/Δ_{\text{in}} $ is identical, the shear-dominated universe, due to its enhanced Hubble expansion rate, leads to an earlier freeze-out point of wash-out asymmetry process and allows a higher upper limit on the self annihilation cross section. Conversely, the Gauss-Bonnet braneworld, with a weakened Hubble expansion rate, delays the freeze-out point and permits a lower upper limit on the self annihilation cross section. We further constrain the wino mass $M_2$ for sneutrino and higgsino asymmetric dark matter in both scenarios, showing that, compared to the standard model, the lower limit of $M_2$ is smaller in the shear-dominated universe but higher in the Gauss-Bonnet braneworld. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2505_04056 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Constraints on Asymmetric Dark Matter Self Annihilation Cross Sections Li, Qiquan Iminniyaz, Hoernisa Liu, Fangyu High Energy Physics - Phenomenology We investigate the evolution of the relic density for asymmetric dark matter incorporating self annihilation processes in both the shear-dominated universe and Gauss-Bonnet braneworld. Under the same conditions where the ratio of final asymmetry to the initial asymmetry $ R \equiv Δ_{-\infty}/Δ_{\text{in}} $ is identical, the shear-dominated universe, due to its enhanced Hubble expansion rate, leads to an earlier freeze-out point of wash-out asymmetry process and allows a higher upper limit on the self annihilation cross section. Conversely, the Gauss-Bonnet braneworld, with a weakened Hubble expansion rate, delays the freeze-out point and permits a lower upper limit on the self annihilation cross section. We further constrain the wino mass $M_2$ for sneutrino and higgsino asymmetric dark matter in both scenarios, showing that, compared to the standard model, the lower limit of $M_2$ is smaller in the shear-dominated universe but higher in the Gauss-Bonnet braneworld. |
| title | Constraints on Asymmetric Dark Matter Self Annihilation Cross Sections |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2505.04056 |