AAS 201st Meeting, January, 2003
Session 67. Cosmic Gas: Long Ago and Far Away
Oral, Tuesday, January 7, 2003, 2:00-3:30pm, 606-607

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[67.01] Neutrino Heating in an Inhomogneous Big Bang Nucleosynthesis Model

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.

If you would like more information about this abstract, please follow the link to http://godel.ph.utexas.edu/Members/juan/welcome.html. This link was provided by the author. When you follow it, you will leave the Web site for this meeting; to return, you should use the Back comand on your browser.

The author(s) of this abstract have provided an email address for comments about the abstract: juan@einstein.ph.utexas.edu

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