hep-ph

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

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.
 Comments: 36 pages, 13 figures, 1 figure from arXiv:1605.01403 Subjects: High Energy Physics - Phenomenology (hep-ph); Cosmology and Nongalactic Astrophysics (astro-ph.CO); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th) Journal reference: JCAP 1711 (2017) no.11, 050 DOI: 10.1088/1475-7516/2017/11/050 Report number: CTPU-17-28, KEK-TH-1990 Cite as: arXiv:1708.01253 [hep-ph] (or arXiv:1708.01253v3 [hep-ph] for this version)

## Submission history

From: Sangjun Lee [view email]
[v1] Thu, 3 Aug 2017 17:59:59 GMT (741kb,D)
[v2] Wed, 16 Aug 2017 04:46:00 GMT (741kb,D)
[v3] Mon, 19 Mar 2018 11:34:46 GMT (763kb,D)