Gravitational waves from first-order phase transitions: Towards model separation by bubble nucleation rate

Author Jinno, Ryusuke · Lee, Sangjun · Seong, Hyeonseok · Takimoto, Masahiro 2017 See all Details

Abstract

We study gravitational-wave production from bubble collisions in a cosmic first-order phase transition, focusing on the possibility of model separation by the bubble nucleation rate dependence of the resulting gravitational-wave spectrum. By using the method of relating the spectrum with the two-point correlator of the energy-momentum tensor $\left< T(x)T(y) \right>$, we first write down analytic expressions for the spectrum with a Gaussian correction to the commonly used nucleation rate, $\Gamma \propto e^{\beta t}\rightarrow e^{\beta t-\gamma^2t^2}$, under the thin-wall and envelope approximations. Then we quantitatively investigate how the spectrum changes with the size of the Gaussian correction. It is found that the spectral shape shows ${\mathcal O}(10)\%$ deviation from $\Gamma \propto e^{\beta t}$ case for some physically motivated scenarios. We also briefly discuss detector sensitivities required to distinguish different spectral shapes.

Details

Title Gravitational waves from first-order phase transitions: Towards model separation by bubble nucleation rate Jinno, Ryusuke · Lee, Sangjun · Seong, Hyeonseok · Takimoto, Masahiro 2017 Research Article eng 36 pages, 13 figures, 1 figure from arXiv:1605.01403 2017-08-03 00:00:00 High Energy Physics · Theory · Phenomenology · General Relativity and Quantum Cosmology
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