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- W2075721967 abstract "We consider the effect of inhomogeneous neutrino degeneracy on big bang nucleosynthesis for the case where the distribution of neutrino chemical potentials is given by a Gaussian. The chemical potential fluctuations are taken to be isocurvature, so that only inhomogeneities in the electron chemical potential are relevant. Then the final element abundances are a function only of the baryon-photon ratio $ensuremath{eta},$ the effective number of additional neutrinos $ensuremath{Delta}{N}_{ensuremath{nu}},$ the mean electron neutrino degeneracy parameter $overline{ensuremath{xi}},$ and the rms fluctuation of the degeneracy parameter, ${ensuremath{sigma}}_{ensuremath{xi}}.$ We find that for fixed $ensuremath{eta},$ $ensuremath{Delta}{N}_{ensuremath{nu}},$ and $overline{ensuremath{xi}},$ the abundances of ${}^{4}mathrm{He},$ D, and ${}^{7}mathrm{Li}$ are, in general, increasing functions of ${ensuremath{sigma}}_{ensuremath{xi}}.$ Hence, the effect of adding a Gaussian distribution for the electron neutrino degeneracy parameter is to decrease the allowed range for $ensuremath{eta}.$ We show that this result can be generalized to a wide variety of distributions for $ensuremath{xi}.$" @default.
- W2075721967 created "2016-06-24" @default.
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- W2075721967 date "2002-08-29" @default.
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- W2075721967 title "Big bang nucleosynthesis with Gaussian inhomogeneous neutrino degeneracy" @default.
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- W2075721967 doi "https://doi.org/10.1103/physrevd.66.043531" @default.
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