Gravitational waves from vacuum bubbles: Ultraviolet dependence on wall thickness
arXiv:2503.00939 · doi:10.1103/k47l-75v4
Abstract
The gravitational wave (GW) spectrum from the first-order phase transition can be characterized by a few phenomenological parameters but with high degeneracies in model/data distinguishments. In this paper, we look into the high-frequency power law of the GW spectrum with preliminary numerical simulations for both quantum and semiclassical pictures of vacuum decay. We first reveal an anticorrelation of the high-frequency power law to a certain power of the ratio between the wall thickness and bubble radius at the onset of bubble collisions, which can be further approximated analytically by some other phenomenological model characteristics to break the model degeneracy.
v1, 12 pages, 6 figures, 2 tables; v2, 14 pages, 6 figures, 2 tables, more details added, code and data made public on GitHub (https://github.com/Jun-Chen-Wang/Two-BubbleSimulation/tree/main), version accepted for publication in Physical Review D; v3, to match the published version
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