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We comprehensively study the effects of bubble wall thickness and speed onthe gravitational wave emission spectrum of collisions of two vacuum bubbles.We numerically simulate a large dynamical range, making use of symmetry toreduce the dimensionality. The high-frequency slope of the gravitational wavespectrum is shown to depend on the thickness of the bubble wall, becomingsteeper for thick-wall bubbles, in agreement with recent fully 3+1 dimensionallattice simulations of many-bubble collisions. This dependence is present, evenfor highly relativistic bubble wall collisions. We use the reduceddimensionality as an opportunity to investigate dynamical phenomena which mayunderlie the observed differences in the gravitational wave spectra. Thesephenomena include `trapping', which occurs most for thin-wall bubbles, andoscillations behind the bubble wall, which occur for thick-wall bubbles.

Vacuum bubble collisions: from microphysics to gravitational waves