Model-independent features of gravitational waves from bubble collisions

Abstract

We study the gravitational radiation produced by the collisions of bubble walls or thin fluid shells in cosmological phase transitions. Using the so-called envelope approximation, we obtain analytically the asymptotic behavior of the gravitational wave spectrum at low and high frequencies for any phase transition model. The complete spectrum can thus be approximated by a simple interpolation between these asymptotes. We verify this approximation with specific examples. We use these results to discuss the dependence of the spectrum on the time and size scales of the source.

arXiv comment52 pages, 12 figures. v2: we considered two more specific cases (Gaussian and constant rates) and we expanded the discussion on time scales

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