Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...216..206l&link_type=abstract
Astrophysical Journal, Part 1, vol. 216, Aug. 15, 1977, p. 206-211.
Astronomy and Astrophysics
Astrophysics
10
Astronomical Models, Astrophysics, Entropy, Galactic Evolution, Relativistic Particles, Adiabatic Conditions, Baryons, Clumps, Jeans Theory, Mass Spectra, Nonlinear Systems
Scientific paper
Shock damping of nonlinear adiabatic fluctuations and entropy production are studied with the aim of suggesting a role for nonlinear fluctuations in the formation of galaxies. A 'coarse-grain' universe assumed to follow a radiation-dominated Friedmann model is considered; in this context the evolution of relativistic simple wave pulses is analyzed using hydrodynamical equations. The primeval spectrum when fluctuations first enter the Jeans length is derived. The case of weakly nonlinear fluctuations, i.e., those arising when the density contrast for the condensing material is less than unity at entrance into Jeans length, is discussed; it is found that below a specified critical mass the fluctuation will not sustain a sufficient amplitude to reach recombination. Strongly nonlinear fluctuations, however, may survive even with very short wavelengths. The amount of entropy produced in the former case is insignificant, but in the latter case it could be arbitrarily large.
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