2017/08/31 by Ryusuke Jinno, Sangjun Lee, Hyeonseok Seong +1
Physics and Astronomy · #hep-ph #astro-ph.CO #gr-qc #hep-th
paper · pdf · doi:10.1088/1475-7516/2017/11/050
published as JCAP 1711 (2017) no.11, 050 · 36 pages, 13 figures, 1 figure from arXiv:1605.01403
arxiv created 2018/03/19 · arxiv updated 2018/03/20
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 < T(x)T(y) >, we first write down analytic expressions for the spectrum with a Gaussian correction to the commonly used nucleation rate, Γ∝ eβt→ eβt-γ2t2, 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 Γ∝ eβt case for some physically motivated scenarios. We also briefly discuss detector sensitivities required to distinguish different spectral shapes.