Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.180d&link_type=abstract
Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:
Astronomy and Astrophysics
Astrophysics
Scientific paper
The most possible mechanism to explain the observed Large Angular Scale Anisotropies (LASA) of the Cosmic Microwave Background is the effect of primordial cosmological perturbations of quantum mechanical origin. We investigate the effect of shear viscosity on the behaviour of Cosmological Perturbations, such as Gravitational Waves and Density Perturbations in the Early Universe, in a classical approach. The results show that the longer wavelength modes of both types are not practically affected, while the shorter modes are more severely affected, but for gravitational waves this damping is within an acceptably small limit. Thus, the long wavelength primordial cosmological perturbations provide information about the Early Universe, through the observed LASA, even in the presence of dissipation.
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