Neutrino heat conduction and inhomogeneities in the early Universe

Details Neutrino heat conduction and inhomogeneities in the early Universe Neutrino heat conduction and inhomogeneities in the early Universe

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phrvd..47.4256h&link_type=abstract

Physical Review D (Particles, Fields, Gravitation, and Cosmology), Volume 47, Issue 10, 15 May 1993, pp.4256-4260

Physics

23

Particle-Theory And Field-Theory Models Of The Early Universe, Elementary Particle Processes, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages

Scientific paper

Constraints on parameters of inhomogeneous nucleosynthesis, namely, the overdensity and size of baryon lumps, are found by calculating the blackbody neutrino heat conduction into the lumps, which tends to inflate them away. The scale size for efficient heat conduction is determined by the mean free path λ of the neutrino, and so we compute λ in our case of a high-temperature plasma with low chemical potential, and find a general result that many-body effects are unimportant, simplifying the calculation. We find that in the region of interest for nucleosynthesis, neutrino inflation is important for overdensities >104.

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