| Texto completo | |
| Autor(es): |
Fong, Chee Sheng
;
Rahat, Moinul Hossain
;
Saad, Shaikh
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of High Energy Physics; v. N/A, n. 11, p. 33-pg., 2022-11-14. |
| Resumo | |
Gravitational production of massive particles due to cosmic expansion can be significant during the inflationary and reheating period of the Universe. If the particle also has non-gravitational interactions that do not significantly affect its production, numerous observational probes open up, including cosmological probes. In this work, we focus on the gravitational production of light vector bosons that couple feebly to the Standard Model (SM) particles. Due to the very feeble coupling, the light vector bosons never reach thermal equilibrium, and if the Hubble scale at the end of inflation is above 10(8) GeV, the gravitational production can overwhelm the thermal production via the freeze-in mechanism by many orders of magnitude. As a result, much stronger constraints from the Big Bang Nucleosynthesis (BBN) can be placed on the lifetime and mass of the vector bosons compared to the scenario where only thermal production is considered. As an example, we study the sub-GeV scale dark photons, which couple to the SM only through kinetic mixing, and derive constraints on the mass and kinetic mixing parameter of the dark photon from the photodisintegration effects on the light element abundances relevant at the end of the BBN when the cosmic age was around 10(4) s. (AU) | |
| Processo FAPESP: | 22/00404-3 - Bariogênese e matéria escura em cosmologia não padrão |
| Beneficiário: | Chee Sheng Fong |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 19/11197-6 - Teste de precisão de bariogênese |
| Beneficiário: | Chee Sheng Fong |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |