Speaker
Mr
Felix Giese
(DESY/Hamburg U.)
Description
We study the energy budget of a first-order cosmological phase transition, which is an important factor in the prediction of the resulting gravitational wave spectrum. Formerly, this analysis was based mostly on simplified models as for example the bag equation of state. Here, we present a model-independent approach that is exact up to the temperature dependence of the speed of sound in the broken phase. For detonations, we find that the only relevant quantities that enter in the hydrodynamic analysis are the speed of sound in the broken phase and a linear combination of the energy and pressure differences between the two phases which we call pseudotrace (normalized to the enthalpy in the broken phase). The pseudotrace quantifies the strength of the phase transition and yields the conventional trace of the energy-momentum tensor for a relativistic plasma (with speed of sound squared of one third). We present results for realistic models where we treat the bubble wall velocity as an external parameter.
Partly based on [2004.06995], partly based on more recent work.
Primary authors
Mr
Felix Giese
(DESY/Hamburg U.)
Ms
Jorinde van de Vis
(DESY)
Dr
Kai Schmitz
(CERN)
Thomas Konstandin
(DESY)
