Matter-antimatter asymmetry and dark matter stability from baryon number conservation
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866916407632986112 |
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| author | Císcar-Monsalvatje, Mar Ibarra, Alejandro Vandecasteele, Jérôme |
| author_facet | Císcar-Monsalvatje, Mar Ibarra, Alejandro Vandecasteele, Jérôme |
| contents | There is currently no evidence for a baryon asymmetry in our Universe. Instead, cosmological observations have only demonstrated the existence of a quark-antiquark asymmetry, which does not necessarily imply a baryon asymmetric Universe, since the baryon number of the dark sector particles is unknown. In this paper we discuss a framework where the total baryon number of the Universe is equal to zero, and where the observed quark-antiquark asymmetry arises from neutron portal interactions with a dark sector fermion $N$ that carries baryon number. In order to render a baryon symmetric universe throughout the whole cosmological history, we introduce a complex scalar $χ$, with opposite baryon number and with the same initial abundance as $N$. Notably, due to the baryon number conservation, $χ$ is absolutely stable and could have an abundance today equal to the observed dark matter abundance. Therefore, in this simple framework, the existence of a quark-antiquark asymmetry is intimately related to the existence (and the stability) of dark matter. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2307_02592 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Matter-antimatter asymmetry and dark matter stability from baryon number conservation Císcar-Monsalvatje, Mar Ibarra, Alejandro Vandecasteele, Jérôme High Energy Physics - Phenomenology There is currently no evidence for a baryon asymmetry in our Universe. Instead, cosmological observations have only demonstrated the existence of a quark-antiquark asymmetry, which does not necessarily imply a baryon asymmetric Universe, since the baryon number of the dark sector particles is unknown. In this paper we discuss a framework where the total baryon number of the Universe is equal to zero, and where the observed quark-antiquark asymmetry arises from neutron portal interactions with a dark sector fermion $N$ that carries baryon number. In order to render a baryon symmetric universe throughout the whole cosmological history, we introduce a complex scalar $χ$, with opposite baryon number and with the same initial abundance as $N$. Notably, due to the baryon number conservation, $χ$ is absolutely stable and could have an abundance today equal to the observed dark matter abundance. Therefore, in this simple framework, the existence of a quark-antiquark asymmetry is intimately related to the existence (and the stability) of dark matter. |
| title | Matter-antimatter asymmetry and dark matter stability from baryon number conservation |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2307.02592 |