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J.F. Lara (Center for Relativity, UT-Austin)
The effect on Big Bang Nucleosynthesis from the heating of neutrinos by scattering with electrons and positrons and by electron-positron annihilation is worked into a spherically symmetric baryon inhomogeneous BBN model. This IBBN model is parametrized by the baryon to photon ratio, \eta, and the size of the model, ri, at an initial temperature T = 100 GK. For a range of \ln ( \eta ) = [ -10.0, -8.5 ] and ri = [ 102, 108 ] cm the heating effect increases the mass fraction X^{4}He by a range of \Delta X^{4}He = [1, 2] \times 10-4. A contour map of \Delta X^{4}He tends to track the contour map of X^{4}He. The effect appears similiar to an upward shift in the value of the baryon to photon ratio. But the heating effect on deuterium is a decrease in abundance ratio Y(d)/Y(p) on the order of 10-3, whereas Y(d)/Y(p) would decrease an order of 10-2 due to a shift in \eta10. Sufficiently accurate deuterium observations can then be used to distinguish the heating effect from other effects.
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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.