Nuclear Kinetic Equilibrium During Big Bang Nucleosynthesis. (arXiv:1811.04932v1 [hep-ph])

Nuclear Kinetic Equilibrium During Big Bang Nucleosynthesis. (arXiv:1811.04932v1 [hep-ph])
<a href="http://arxiv.org/find/hep-ph/1/au:+McDermott_S/0/1/0/all/0/1">Samuel D. McDermott</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Turner_M/0/1/0/all/0/1">Michael S. Turner</a>

Sasankan et al, have recently claimed that there are significant deviations
in the phase-space distributions of the kinetic energies of nuclei from the
Maxwell-Boltzmann form usually assumed in BBN, and further, that these
deviations lead to big changes in the predicted light-element abundances.
Solving the relativistic Boltzmann equation perturbatively, we explicitly show
that these deviations are not 20% as claimed, but rather are about 10^-17 in
size and hence cannot significantly alter the predicted light-element
abundances. We discuss and compute two related effects: O(0.1%) corrections to
the kinetic distributions of nuclei that arise from small relativistic
corrections to the MB distribution and a much smaller effect, nuclear kinetic
drag, which arises from the heat transferred from the EM plasma to nuclei that
is needed to maintain kinetic equilibrium.

Sasankan et al, have recently claimed that there are significant deviations
in the phase-space distributions of the kinetic energies of nuclei from the
Maxwell-Boltzmann form usually assumed in BBN, and further, that these
deviations lead to big changes in the predicted light-element abundances.
Solving the relativistic Boltzmann equation perturbatively, we explicitly show
that these deviations are not 20% as claimed, but rather are about 10^-17 in
size and hence cannot significantly alter the predicted light-element
abundances. We discuss and compute two related effects: O(0.1%) corrections to
the kinetic distributions of nuclei that arise from small relativistic
corrections to the MB distribution and a much smaller effect, nuclear kinetic
drag, which arises from the heat transferred from the EM plasma to nuclei that
is needed to maintain kinetic equilibrium.

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