2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/9505In present talk I show that primordial helical turbulence produced during a first-order phase transition induces circularly polarized cosmological gravitational waves (GWs). The degree of polarization as well as the characteristic frequency and the amplitude of these GWs depend crucially on phase-transition model of primordial turbulence. I present a brief discussion on the possibility of detection.Talk given at ICTP workshop "Nonlinear Cosmology", ICTP, Trieste, Italy (May 2005). To appear in special volume of International Journal of Modern Physics DAstrophysicstext