Acoustic instabilities at the transition from the radiation-dominated to the matter-dominated universe

Details Acoustic instabilities at the transition from the radiation-dominated to the matter-dominated universe Acoustic instabilities at the transition from the radiation-dominated to the matter-dominated universe

2001-06-29

arxiv.org/abs/astro-ph/0106562v4

Astron.Astrophys.419:801-810,2004

Astronomy and Astrophysics

Astrophysics

11 pages, 6 figures, accepted to A&A

Scientific paper

10.1051/0004-6361:20040097

The transition from acoustic noise in the radiation-dominated universe to the density structures in the matter dominated epoch is considered. The initial state is a stochastic field of sound waves moving in different directions. The construction of the initial state is compatible with the hyperbolic type of propagation equation for density perturbations, and parallel to the theory of stochastic background of gravitational waves. Instantaneous transition between the cosmological epochs is assumed, and Darmois-Israel joining conditions are applied to match solutions for sound waves with growing or decaying modes at the decoupling. As a result a substantial amplification of the low scale structures is obtained.

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