Regular Article – Theoretical Physics
Gravitational wave spectra from strongly supercooled phase transitions
Physics Department, King’s College London, WC2R 2LS, London, UK
2 Faculty of Physics, University of Warsaw, ul. Pasteura 5, 02-093, Warsaw, Poland
3 NICPB, Rävala 10, 10143, Tallinn, Estonia
Accepted: 20 October 2020
Published online: 30 October 2020
We study gravitational wave (GW) production in strongly supercooled cosmological phase transitions, taking particular care of models featuring a complex scalar field with a U(1) symmetric potential. We perform lattice simulations of two-bubble collisions to properly model the scalar field gradients, and compute the GW spectrum sourced by them using the thin-wall approximation in many-bubble simulations. We find that in the U(1) symmetric case the low-frequency spectrum is whereas for a real scalar field it is . In both cases the spectrum decays as at high frequencies.
© The Author(s) 2020
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