Evolution of perturbations in a domain wall cosmology

Details Evolution of perturbations in a domain wall cosmology Evolution of perturbations in a domain wall cosmology

2000-10-11

arxiv.org/abs/gr-qc/0010046v1

Braz.J.Phys. 33 (2003) 834-839

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Latex file, 8 pages

Scientific paper

A fluid of domain walls has an effective equation of state $p_w = - {2/3}\rho_w$. This equation of state is qualitativelly in agreement with the supernova type Ia observations. We exploit a cosmological model where the matter content is given by a dust fluid and a domain wall fluid. The process of formation of galaxies is essentially preserved. On the other hand, the behaviour of the density contrast in the ordinary fluid is highly altered when domain walls begin to dominate the matter content of the Universe. This domain wall phase occurs at relative recent era, and its possible consequences are discussed, specially concerning the Sachs-Wolfe effect.

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