Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979zhetf..77..434z&link_type=abstract
Zhurnal Eksperimental'noi i Teoreticheskoi Fiziki, vol. 77, Aug. 1979, p. 434-450. In Russian.
Astronomy and Astrophysics
Astronomy
13
Astronomical Models, Cosmology, Gravitational Effects, Neutrinos, Relativity, Asymptotic Methods, Ideal Fluids, Isotropic Media, Particle Interactions, Perturbation Theory
Scientific paper
It is shown that the kinetics of gravitational-perturbation interaction with collisionless particles (neutrinos) during the ultrarelativistic stage in the expansion of the universe results in a behavior of long-wave gravitational perturbations that is qualitatively different than that obtained by Lifshits (1946), if the energy density of the collisionless particles amounts to more than 5/32 of the total energy density. Most importantly, the long-wave asymptotic behavior in the present case is found to be oscillatory. The asymptotic behavior of high-frequency perturbations in an isotropic universe is also determined, by taking into account the effect of collisionless particles on gas perturbations.
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