Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 11, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2017/11/050
Keywords
cosmological phase transitions; gravitational waves / sources
Funding
- IBS [IBS-R018-D1]
- JSPS
- Ministry of Science & ICT (MSIT), Republic of Korea [IBS-R018-D1-2017-A00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Grants-in-Aid for Scientific Research [16J07038] Funding Source: KAKEN
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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, Gamma proportional to e(beta t) -> e(beta t-gamma 2t2), 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 O(10)% deviation from Gamma proportional to e(beta t) case for some physically motivated scenarios. We also briefly discuss detector sensitivities required to distinguish different spectral shapes.
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