Physics – Nuclear Physics
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nuphs..14..149b&link_type=abstract
Nuclear Physics B Proceedings Supplements, Volume 14, Issue 2, p. 149-156.
Physics
Nuclear Physics
1
Scientific paper
Throughout most of its history, the Universe has been expanding isentropically. If, however, thermal equilibrium were always maintained, then all memory would be erased. The most significant cosmological events must, therefore, be the irreversible processes, since these are the ones that leave cosmological relics we can attempt to observe today. In this lecture, we will discuss (I) The decoupling of β-decay neutrinos freezing the neutron-proton ratio and leading to the cosmological synthesis of the light elements; (II) Other hot and cold thermal relics remaining from the freezing of massive particles out of equilibrium and leading to closure bounds on the masses of stable neutrinos; (III) Mass and lifetime bounds for unstable neutrinos obtained from cosmology and astrophysics; (IV) The growth of density fluctuations producing the large scale structure observed in the Universe. The lectures owe a great deal to the Kolb and Turner reviews in references 1, 2, 5.
Supported in part by US DOE Contract No. EY-76-C-02-3071.
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