Gauge-field-induced torsion and cosmic inflation

Inflation in the framework of Einstein-Cartan theory is revisited. a natural extension General Relativity, with non-vanishing torsion. The connection on Riemann-Cartan spacetime only compatible cosmological principal for particular form We show this to also be gauge invariance principle non-Abelian and Abelian fields under certain deviced minimal coupling procedure. adopt an field "cosmic triad". dynamical equations are obtained shown sustain cosmic inflation large number e-folds. emphasize that at end inflation, torsion vanishes reduces Relativity usual FRW geometry.