http://arxiv.org/abs/1812.09472
We propose a correction of standard big bang nucleosynthesis (BBN) scenario to resolve the primordial lithium problem by considering a possibility that the primordial plasma can deviate from the ideal state. In the standard BBN, the primordial plasma is assumed to be ideal, particles and photons satisfying the Maxwell-Boltzmann and Planck distribution, respectively. We suggest that this assumption of the primordial plasma being ideal might oversimplify the early universe and cause the lithium problem. We find that deviation of photon distribution from the Planck distribution, which is parameterized with the help of Tsallis statistics, can resolve the primordial lithium problem when the particle distributions of the primordial plasma still follow the Maxwell- Boltzmann distribution. We discuss how the primordial plasma can be weakly non-ideal in this specific fashion and its effects on the cosmic evolution.
D. Jang, Y. Kwon, K. Kwak, et. al.
Thu, 27 Dec 18
67/80
Comments: 5 pages, 3 figures