Gravitational waves from bubble collisions and fluid motion in strongly supercooled phase transitions

被引：49

作者：

Lewicki, Marek ^{[1
]}

Vaskonen, Ville ^{[2
]}

机构：

[1] Univ Warsaw, Fac Phys, Ul Pasteura 5, PL-02093 Warsaw, Poland

[2] Inst Fis Altes Energies, Campus UAB, Bellaterra 08193, Barcelona, Spain

来源：

EUROPEAN PHYSICAL JOURNAL C | 2023年 / 83卷 / 02期

关键词：

SEARCH; RADIATION; VACUUM;

D O I：

10.1140/epjc/s10052-023-11241-3

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We estimate the gravitational wave spectra generated in strongly supercooled phase transitions by bubble collisions and fluid motion. We derive analytically in the thin-wall approximation the efficiency factor that determines the share of the energy released in the transition between the scalar field and the fluid. We perform numerical simulations including the efficiency factor as a function of bubble radius separately for all points on the bubble surfaces to take into account their different collision times. We find that the efficiency factor does not significantly change the gravitational wave spectra and show that the result can be approximated by multiplying the spectrum obtained without the efficiency factor by its value at the radius R-eff ? 5/beta, where )5 is the approximate inverse duration of the transition. We also pro-vide updated fits for the gravitational wave spectra produced in strongly supercooled transitions from both bubble colli-sions and fluid motion depending on the behaviour of the sources after the collision.

引用

页数：10

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