Gravitational waves from the fragmentation of a supersymmetric condensate
We discuss the production of gravity waves from the fragmentation of a supersymmetric condensate in the early universe. Supersymmetry predicts the existence of flat directions in the potential. At the end of inflation, the scalar fields develop large time-dependent vacuum expectation values along these flat directions. Under some general conditions, the scalar condensates undergo a fragmentation into non-topological solitons, Q-balls. We study this process numerically and confirm the recent analytical calculations showing that it can produce gravity waves observable by Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO), Laser Interferometer Space Antenna (LISA), and Big Bang Observer (BBO). The fragmentation can generate gravity waves with an amplitude as large as Omega_{GW}~10^{-11} and with a peak frequency ranging from mHz to 10 Hz, depending on the parameters. The discovery of such a relic gravitational background radiation can open a new window on the physics at the high scales, even if supersymmetry is broken well above the electroweak scale.