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http://eprints.org/relation/isVersionOf http://eprints.iliauni.edu.ge/id/document/2853 http://eprints.org/relation/isVolatileVersionOf http://eprints.iliauni.edu.ge/id/document/2853 http://eprints.org/relation/issmallThumbnailVersionOf http://eprints.iliauni.edu.ge/id/document/2853 archive 131 disk0/00/00/07/35 2014-01-30 12:38:56 2015-03-27 07:04:53 2014-01-30 12:38:56 article show Kahniashvili Tina tinatin@iliauni.edu.ge Kosowsky Arthur Gogoberidze Grigol Maravin Yurii pub QB QC public Gravitational waves potentially represent our only direct probe of the universe when it was less than one second old. In particular, first-order phase transitions in the early universe can generate a stochastic background of gravitational waves which may be detectable today. We briefly summarize the physical sources of gravitational radiation from phase transitions and present semianalytic expressions for the resulting gravitational wave spectra from three distinct realistic sources: bubble collisions, turbulent plasma motions, and inverse-cascade helical magnetohydrodynamic turbulence. Using phenomenological parameters to describe phase transition properties, we determine the region of parameter space for which gravitational waves can be detected by the proposed Laser Interferometer Space Antenna. The electroweak phase transition is detectable for a wide range of parameters. 2008 published Physical Review D 78 043003 TRUE