期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 10, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2012/10/024
关键词
gravitational waves / sources; cosmological phase transitions; gravitational wave detectors; particle physics - cosmology connection
资金
- Universidad Nacional de Mar del Plata, Argentina [EXA 473/10, 505/10]
- CONICET [PIP 122-201009-00315, PIP 112-200801-00943]
- CIC (Buenos Aires, Argentina)
We study the generation of gravitational waves in the electroweak phase transition. We consider a few extensions of the Standard Model, namely, the addition of scalar singlets, the minimal supersymmetric extension, and the addition of TeV fermions. For each model we consider the complete dynamics of the phase transition. In particular, we estimate the friction force acting on bubble walls, and we take into account the fact that they can propagate either as detonations or as deflagrations preceded by shock fronts, or they can run away. We compute the peak frequency and peak intensity of the gravitational radiation generated by bubble collisions and turbulence. We discuss the detectability by proposed spaceborne detectors. For the models we considered, runaway walls require significant fine tuning of the parameters, and the gravitational wave signal from bubble collisions is generally much weaker than that from turbulence. Although the predicted signal is in most cases rather low for the sensitivity of LISA, models with strongly coupled extra scalars reach this sensitivity for frequencies f similar to 10(-4) Hz, and give intensities as high as h(2)Omega(GW) similar to 10(-8).
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