Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....43..189b&link_type=abstract
Astronomy and Astrophysics, vol. 43, no. 2, Oct. 1975, p. 189-199. Research supported by the Consiglio Nazionale delle Ricerche
Astronomy and Astrophysics
Astrophysics
14
Big Bang Cosmology, Galactic Evolution, Gravitation Theory, Propagation Modes, Adiabatic Conditions, Fluctuation Theory, Hydrogen, Inhomogeneity, Jeans Theory, Perturbation Theory
Scientific paper
Two acoustic modes are possible in the Universe before cosmological hydrogen decoupling occurs; they involve fluctuations which can be roughly described as either adiabatic or isothermal. In this article, the two modes are studied in detail, together with the different kinds of gravitational instabilities connected with them. A particular study is devoted to the time when the decoupling itself occurs, as this is the only time during which it is reasonable to expect a transfer of energy from one mode to the other. As this transfer can be relevant only over large scales, a lower limit can be imposed on the mass of a matter fluctuation after decoupling (which will necessarily be isothermal) arising from an adiabatic fluctuation prior to decoupling. A number of peculiar features of the two acoustic regimes are also emphasized.
Bonometto Silvio A.
Lucchin Francesco
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