Dissipative Effects in the Expansion of the Universe. I.
1972; IOP Publishing; Volume: 171; Linguagem: Inglês
10.1086/151294
ISSN1538-4357
AutoresRichard A. Matzner, Charles W. Misner,
Tópico(s)Geophysics and Gravity Measurements
Resumoview Abstract Citations (58) References (13) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Dissipative Effects in the Expansion of the Universe. I. Matzner, Richard A. ; Misner, Charles W. Abstract We consider dissipative processes in anisotropic homogeneous world models, and show that dissipation reduces the anisotropy. A suitably defined anisotropy energy density can in fact be reduced arbitrarily quickly involving particles with moderate to long mean free paths. A discussion is given of the viscosity approximation and its range of applicability. Examples are presented which have been calculated by the use of a simple approximation to the collision-time method, using the cross- section appropriate to weak-interaction neutrino scattering. We find that such dissipation is quite effective except for one particular cosmological model which is axisymmetric and in which the entire expansion of the model is taken up by expansion along the axis. A succeeding paper uses a more accurate collision-time formulation, and shows that there is effective heating even in this special model. Publication: The Astrophysical Journal Pub Date: February 1972 DOI: 10.1086/151294 Bibcode: 1972ApJ...171..415M full text sources ADS | Related Materials (1) Part 2: 1972ApJ...171..433M
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