Heavy neutrinos and the evolution of primordial gravitational perturbations

Details Heavy neutrinos and the evolution of primordial gravitational perturbations Heavy neutrinos and the evolution of primordial gravitational perturbations

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984azh....61..654r&link_type=abstract

(Astronomicheskii Zhurnal, vol. 61, July-Aug. 1984, p. 654-664) Soviet Astronomy (ISSN 0038-5301), vol. 28, July-Aug. 1984, p. 3

Astronomy and Astrophysics

Astronomy

2

Astronomical Models, Cosmology, Gravitational Waves, Neutrinos, Universe, Evolution (Development), Gravity Anomalies, Particle Interactions, Plasma Density

Scientific paper

Gravitational perturbations are considered in a standard model universe filled with weakly interacting, finite-mass neutrinos and a radiation-dominated plasma. By including the density perturbations in the neutrino gas, one obtains a different law for the evolution of adiabatic perturbations in the plasma. For scalar perturbations, an initial deviation from the background metric will be damped by the kinetic mechanism. The dependence of the damping decrement on the perturbation wave vector is determined.

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