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Astrophysics > Cosmology and Nongalactic Astrophysics

arXiv:2108.11947 (astro-ph)
[Submitted on 26 Aug 2021 (v1), last revised 20 Dec 2021 (this version, v2)]

Title:Effect of density fluctuations on gravitational wave production in first-order phase transitions

Authors:Ryusuke Jinno, Thomas Konstandin, Henrique Rubira, Jorinde van de Vis
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Abstract:We study the effect of density perturbations on the process of first-order phase transitions and gravitational wave production in the early Universe. We are mainly interested in how the distribution of nucleated bubbles is affected by fluctuations in the local temperature. We find that large-scale density fluctuations ($H_* < k_* < \beta$) result in a larger effective bubble size at the time of collision, enhancing the produced amplitude of gravitational waves. The amplitude of the density fluctuations necessary for this enhancement is ${\cal P}_\zeta (k_*) \gtrsim (\beta / H_*)^{-2}$, and therefore the gravitational wave signal from first-order phase transitions with relatively large $\beta / H_*$ can be significantly enhanced by this mechanism even for fluctuations with moderate amplitudes.
Comments: 22 pages, 14 figures, published version
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Physics - Phenomenology (hep-ph)
Report number: DESY 21-131
Cite as: arXiv:2108.11947 [astro-ph.CO]
  (or arXiv:2108.11947v2 [astro-ph.CO] for this version)
  https://doi.org/10.48550/arXiv.2108.11947
Journal reference: JCAP 12 (2021) 12, 019
Related DOI: https://doi.org/10.1088/1475-7516/2021/12/019

Submission history

From: Jorinde van de Vis [view email]
[v1] Thu, 26 Aug 2021 17:57:56 UTC (9,302 KB)
[v2] Mon, 20 Dec 2021 12:47:50 UTC (9,303 KB)
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