Relic Backgrounds of Gravitational Waves from Cosmic Turbulence

Details Relic Backgrounds of Gravitational Waves from Cosmic Turbulence Relic Backgrounds of Gravitational Waves from Cosmic Turbulence

2002-06-26

arxiv.org/abs/astro-ph/0206461v1

Phys.Rev. D66 (2002) 103505

Astronomy and Astrophysics

Astrophysics

25 pages, 1 figure

Scientific paper

10.1103/PhysRevD.66.103505

Turbulence may have been produced in the early universe during several kind of non-equilibrium processes. Periods of cosmic turbulence may have left a detectable relic in the form of stochastic backgrounds of gravitational waves. In this paper we derive general expressions for the power spectrum of the expected signal. Extending previous works on the subject, we take into account the effects of a continuous energy injection power and of magnetic fields. Both effects lead to considerable deviations from the Kolmogorov turbulence spectrum. We applied our results to determine the spectrum of gravity waves which may have been produced by neutrino inhomogeneous diffusion and by a first order phase transition. We show that in both cases the expected signal may be in the sensitivity range of LISA.

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