Polarized Cosmological Gravitational Waves from Primordial Helical Turbulence
Abstract
We show that helical turbulence produced during a first-order phase transition generates circularly polarized cosmological gravitational waves (GWs). The characteristic frequency of these GWs for an extreme case of the phase transition model is around 10-3 --- 10-2 Hz with an energy density parameter as high as 10-12 --- 10-11. The possibility of detection is briefly discussed.
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