Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 6, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2010/06/028
Keywords
baryon asymmetry; physics of the early universe; cosmological phase transitions; cosmology of theories beyond the SM
Funding
- European Commission
- European Research Council
- Marie Curie Research and Training Networks [MRTN-CT-2006-035863]
- Spanish Consolider-Ingenio 2010 Programme CPAN [CSD2007-00042]
- Comunidad Autonoma de Madrid [HEPHACOS P-ESP-00346]
- Spanish Ministry MICNN [FPA 2007-60252]
- ICREA Funding Source: Custom
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The study of the hydrodynamics of bubble growth in first-order phase transitions is very relevant for electroweak baryogenesis, as the baryon asymmetry depends sensitively on the bubble wall velocity, and also for predicting the size of the gravity wave signal resulting from bubble collisions, which depends on both the bubble wall velocity and the plasma fluid velocity. We perform such study in different bubble expansion regimes, namely deflagrations, detonations, hybrids (steady states) and runaway solutions (accelerating wall), without relying on a specific particle physics model. We compute the efficiency of the transfer of vacuum energy to the bubble wall and the plasma in all regimes. We clarify the condition determining the runaway regime and stress that in most models of strong first-order phase transitions this will modify expectations for the gravity wave signal. Indeed, in this case, most of the kinetic energy is concentrated in the wall and almost no turbulent fluid motions are expected since the surrounding fluid is kept mostly at rest.
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