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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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Kahniashvili et al. (2005) studied this question.
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