Damping of Gravitational Waves and Density Perturbations in the Early Universe

Details Damping of Gravitational Waves and Density Perturbations in the Early Universe Damping of Gravitational Waves and Density Perturbations in the Early Universe

1998-05-06

arxiv.org/abs/gr-qc/9805016v1

Astron.Astrophys.Trans.18:543,1999

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages, no figures Submitted in Astronomical and Astrophysical Transactions for the Proccedings of JENAM-97

Scientific paper

10.1080/10556799908203012

Since the discovery of the large angular scale anisotropies in the microwave background radiation, the behaviour of cosmological perturbations (especially, density perturbations and gravitational waves) has been of great interest. In this study, after a detailed and rigorous treatment of the behaviour of gravitational waves in viscous cosmic media, we conclude that the damping of cosmological gravitational waves of long wavelengths is negligible for most cases of physical interest. A preliminary analysis suggests that similar results hold for density perturbations in the long wavelength limit. Therefore, long wavelength cosmological perturbations have not been practically affected by viscous processes,and are good probes of the very early Universe.

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