  We consider the generation of gravitational waves by primordial helical
inverse cascade magnetohydrodynamic (MHD) turbulence produced by bubble
collisions at the electroweak phase transition. We extend the previous study
\cite{kgr08} by considering both currently discussed models of MHD turbulence.
For popular electroweak phase transition parameter values, the generated
gravitational wave spectrum is only weakly dependent on the MHD turbulence
model. Compared to the unmagnetized electroweak phase transition case, the
spectrum of MHD-turbulence-generated gravitational waves peaks at lower
frequency with larger amplitude and can be detected by the proposed Laser
Interferometer Space Antenna

Astrophysics