Abstract
view Abstract Citations (38) References (8) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Relaxation Time of Neutrinos in the Early Universe Herrera, M. A. ; Hacyan, S. Abstract The relaxation time of neutrinos and antineutrinos interacting with electrons and positrons in the early universe is calculated using the relativistic version of the two-temperature formalism, and the cross sections predicted by the Weinberg-Salam theory. The results indicate that primordial neutrinos decoupled from the rest of matter at a temperature around 2 x 10 to the 10th K. It is also shown that, as a consequence of this result, the ratio of the radiation temperature to the neutrino temperature becomes 0.2 percent smaller than the standard value (11/4) 1/3 and that the He-4 abundance resulting from primeval nucleosynthesis will differ, also from the standard value, by an amount of -0.000188. Publication: The Astrophysical Journal Pub Date: January 1989 DOI: 10.1086/167032 Bibcode: 1989ApJ...336..539H Keywords: Neutrinos; Relaxation Time; Universe; Nuclear Fusion; Particle Interactions; Relativistic Theory; Physics (General); EARLY UNIVERSE; NEUTRINOS full text sources ADS |
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