Dynamical Screening Effects on Big Bang Nucleosynthesis
  A moving ion in plasma creates a deformed electric potential depending on the
ion velocity, which leads to the distinct screening effect compared to the
standard static Salpeter formula. In this paper, adopting the test charge
method, we explore the dynamical screening effects on big bang nucleosynthesis
(BBN). We find that the high temperature in the early universe causes the ion
velocity to be faster than the solar condition so that the electric potential
is effectively polarized. However, the low density of background plasma
components significantly suppresses the dynamical screening effects on
thermonuclear reaction rates during the BBN epoch. We compare our results with
several thermonuclear reaction rates for solar fusion considering the dynamical
screening effects. Also, we discuss the additional plasma properties in other
astrophysical sites for the possible expansion from the present calculation in
the future.
