Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.6701l&link_type=abstract
American Astronomical Society, 201st AAS Meeting, #67.01; Bulletin of the American Astronomical Society, Vol. 34, p.1217
Other
Scientific paper
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, η , and the size of the model, ri, at an initial temperature T = 100 GK. For a range of ln ( η ) = [ -10.0, -8.5 ] and ri = [ 102, 108 ] cm the heating effect increases the mass fraction X_4 He by a range of Δ X_4 He = [1, 2] x 10-4. A contour map of Δ 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 η 10. Sufficiently accurate deuterium observations can then be used to distinguish the heating effect from other effects.
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