Big bang nucleosynthesis in a weakly non-ideal plasma. (arXiv:1812.09472v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Jang_D/0/1/0/all/0/1">Dukjae Jang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kwon_Y/0/1/0/all/0/1">Youngshin Kwon</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kwak_K/0/1/0/all/0/1">Kyujin Kwak</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cheoun_M/0/1/0/all/0/1">Myung-Ki Cheoun</a>

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.

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.

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