Gravitational waves from first-order phase transitions: Towards model separation by bubble nucleation rate
| Autor: | Ryusuke Jinno, Sangjun Lee, Hyeonseok Seong, Masahiro Takimoto |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Physics
High Energy Physics - Theory Phase transition Cosmology and Nongalactic Astrophysics (astro-ph.CO) 010308 nuclear & particles physics Gravitational wave Critical phenomena Nucleation FOS: Physical sciences Astronomy and Astrophysics General Relativity and Quantum Cosmology (gr-qc) 01 natural sciences General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) Correlation function High Energy Physics - Theory (hep-th) Quantum mechanics 0103 physical sciences Production (computer science) Tensor 010306 general physics Envelope (waves) Astrophysics - Cosmology and Nongalactic Astrophysics |
| Popis: | 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. Comment: 36 pages, 13 figures, 1 figure from arXiv:1605.01403 |
| Databáze: | OpenAIRE |
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