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Gravitational radiation from cosmological turbulence

2002; American Physical Society; Volume: 66; Issue: 2 Linguagem: Inglês

10.1103/physrevd.66.024030

1538-4500

Arthur Kosowsky, Andrew Mack, Tina Kahniashvili,

Astrophysics and Cosmic Phenomena

An injection of energy into the early Universe on a given characteristic length scale will result in turbulent motions of the primordial plasma. We calculate the stochastic background of gravitational radiation arising from a period of cosmological turbulence, using a simple model of isotropic Kolmogoroff turbulence produced in a cosmological phase transition. We also derive the gravitational radiation generated by magnetic fields arising from a dynamo operating during the period of turbulence. The resulting gravitational radiation background has a maximum amplitude comparable to the radiation background from the collision of bubbles in a first-order phase transition, but at a lower frequency, while the radiation from the induced magnetic fields is always subdominant to that from the turbulence itself. We briefly discuss the detectability of such a signal.