Mathematics – Logic
Scientific paper
Jul 1968
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968saosr.281.....m&link_type=abstract
SAO Special Report #281 (1968)
Mathematics
Logic
Scientific paper
The calculation of the time dependence of the temperature of the matter and radiation in an expanding universe, in the early stages of which nuclear reactions take place, is presented in some detail. The present treatment differs from more conventional ones (Wagoner, Fowler, and Hoyle, 1967; Peebles, 1966a,b), in that 1) we begin with a cold neutron universe (no leptons), 2) we compute explicitly the contribution made to the heat content by the exothermic nuclear reactions, and 3) the temperature is calculated exactly, rather than by the T ~ R-1 approximation. In order to find the temperature at which decoupling of matter and radiation take place, we solve the Saha equation in a self-consistent way. The energy gain of an electron gas through free-free absorption is calculated to second order in the temperature difference. (This is a new result.) Decoupling is found to take place between about 4500 K and 2500 K. It is found that for the whole range of possible initial densities, the present residual blackbody radiation temperature would be less than 0.8 K, so that this model cannot be invoked as an explanation of the currently observed 2.7 K cosmological temperature (Stokes, Partridge, and Wilkinson, 1967). The temperature increase due to recombination radiation is found to lower Γ below 4/3, so that instabilities leading to galaxy formation at such an epoch are conceivable.
No associations
LandOfFree
The Coupling of Matter and Radiation in Cosmology does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Coupling of Matter and Radiation in Cosmology, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Coupling of Matter and Radiation in Cosmology will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-757509