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- W2043826309 abstract "The subject of primordial nucleosynthesis in anisotropic cosmologies is reinvestigated. Simple time-scale models are examined and shown to be inadequate to describe the physics of anisotropic nucleosynthesis. A simple model including $ensuremath{nu}stackrel{-}{ensuremath{nu}}ensuremath{rightarrow}e{e}^{+}$ dissipation is shown to lower both $X(^{4}mathrm{He})$ and $X(mathrm{D})$ from the standard value for certain values of the initial shear. More sophisticated models are developed which include a new anisotropy formalism, $ensuremath{nu}ensuremath{nu}ensuremath{rightarrow}ensuremath{nu}ensuremath{nu}$ scatterings, and the effect of neutrino blue-shifts on the weak reaction rates. In the most realistic model, $X(^{4}mathrm{He})$ is found to increase sharply with increasing shear, but not primarily for the reasons given in time-scale arguments. New limits are placed on anisotropy at the epoch of nucleosynthesis. Limits on the quadrupole anisotropy at nucleosynthesis put limits on the microwave-temperature quadrupole anisotropy now. Estimates of the current microwave-temperature anisotropy, based on the requirement $X(^{4}mathrm{He})stackrel{ifmmode tilde{}else ~{}fi{}}{<}0.26$ (mass fraction) gives limits approximately a factor of 10 smaller (stronger) than current observational limits on the temperature anisotropy, if there is a massive neutrino, ${m}_{ensuremath{nu}}ensuremath{sim}30$ eV. If all neutrinos are massless we find a limit approximately a factor of ten weaker than the observational quadrupole temperature-anisotropy limit." @default.
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- W2043826309 date "1984-10-01" @default.
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- W2043826309 title "Nucleosynthesis in anisotropic cosmologies revisited" @default.
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- W2043826309 doi "https://doi.org/10.1103/physrevd.30.1649" @default.
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