Astronomy and Astrophysics – Astrophysics
Scientific paper
1994-09-05
Astropart.Phys.3:95-102,1995
Astronomy and Astrophysics
Astrophysics
13 pages in standard LaTex + 4 uuencoded figures in separeted files, Uppsala UUITP 14/1994
Scientific paper
10.1016/0927-6505(94)00030-7
In this paper we discuss limits on magnetic fields that could have been present at nucleosynthesis time. We considered several effects that could be relevant modifing light elements relic abundances. They include: changes in reaction rates, mass shifts due to strong and electromagnetic interactions, variation of the expansion rate of the Universe due to both the magnetic field energy density and the increasing of the electrons density in overcritical magnetic fields. We find that the latter is the main effect. It was not taken into account in previous calculations. The allowed field intensity at the end of nucleosynthesis ($T =1\times 10^9\;^o{\rm K}$) is $B \le 3\times 10^{10}$ Gauss.
Grasso Dario
Rubistein H. R.
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