BBN photodisintegration constraints on gravitationally produced vector bosons

Author:

Fong Chee Sheng,Rahat Moinul Hossain,Saad ShaikhORCID

Abstract

Abstract 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 108 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 104 s.

Publisher

Springer Science and Business Media LLC

Subject

Nuclear and High Energy Physics

Cited by 3 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. NANOGrav signal from axion inflation;Physical Review D;2023-12-14

2. Cosmologically varying kinetic mixing;Journal of High Energy Physics;2023-11-07

3. Non-perturbative effects for dark sectors with QCD portals;Journal of High Energy Physics;2023-08-01

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