Gravitational waves from deflagration bubbles in first-order phase transitions
Abstract
The walls of bubbles in a first-order phase transition can propagate either as detonations, with a velocity larger than the speed of sound, or deflagrations, which are subsonic. We calculate the gravitational radiation that is produced by turbulence during a phase transition which develops via deflagration bubbles. We take into account the fact that a deflagration wall is preceded by a shock front which distributes the latent heat throughout space and influences other bubbles. We show that turbulence can induce peak values of GW as high as 10-9. We discuss the possibility of detecting at LISA gravitational waves produced in the electroweak phase transition with wall velocities vw 10-1, which favor electroweak baryogenesis.
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