Gravitational wave spectra from strongly supercooled phase transitions

Marek Lewicki, Ville Vaskonen
2020 European Physical Journal C: Particles and Fields  
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 $$\propto \omega $$ ∝
more » ... propto \omega $$ ∝ ω whereas for a real scalar field it is $$\propto \omega ^3$$ ∝ ω 3 . In both cases the spectrum decays as $$\omega ^{-2}$$ ω - 2 at high frequencies.
doi:10.1140/epjc/s10052-020-08589-1 fatcat:hqpxvywklrde7lkm23zzo4ophe