Detectability of Gravitational Waves from Phase Transitions

Abstract

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 semi-analytic 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.

9 pages, 11 figures, Eq. 9 and Fig. 1 corrected, conclusions unchanged, references added, PRD accepted

References in corpus (7)

• Theory and Numerics of Gravitational Waves from Preheating after Inflation
• A Gravitational Wave Background from Reheating after Hybrid Inflation
• Dynamics of Non-renormalizable Electroweak Symmetry Breaking
• CMB anisotropies from primordial inhomogeneous magnetic fields
• Magnetic field production during preheating at the electroweak scale
• Nonlinear current helicity fluxes in turbulent dynamos and alpha quenching
• Scaling laws in decaying helical hydromagnetic turbulence