Astronomy and Astrophysics – Astrophysics
Scientific paper
1993-08-27
Phys.Rev.D49:5006-5018,1994
Astronomy and Astrophysics
Astrophysics
17 pages in Plain TeX plus 5 tables and 7 figures; FNAL preprint
Scientific paper
10.1103/PhysRevD.49.5006
The effects of magnetic fields on Big Bang Nucleosynthesis(BBN) have been calculated, and the impact on the abundances of the light elements have been investigated numerically. An upper limit on the strength of primordial magnetic fields compatible with observations of light element abundances has been thus obtained. In the framework of standard BBN theory, the maximum strength of the primordial magnetic fields, on scales greater than $10^4$cm but smaller than the event horizon at the BBN epoch ($\sim 1$ min., $\sim 2\times 10^{12}$cm), is $\le 10^{11}$ Gauss. This limit is shown to allow magnetic fields at the time of recombination no stronger than $\sim 0.1$ gauss on scales $\ge 10^{11}{\rm cm}$. Our results also strongly indicate that, at the BBN epoch, and for field strengths $B\le10^{13}$gauss, the effects of magnetic fields on the primordial abundances of light elements are dominated by effects from reaction rates in the presense of primeval magnetic fields rather than by magnetic density effects on the expansion rate.
Cheng Baolian
Schramm David N.
Truran James W.
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