Seminario

Il giorno 14 aprile presso la stanza 412, il Dr Antonio Racioppi terra' un seminario dal titolo

Inflation in metric-affine gravity

Abstract

Metric-affine gravity provides an interesting alternative to Einstein's General Relativity and a powerful tool for building successful inflationary models. In such a framework, the metric tensor and the affine connection are independent dynamical quantities. We consider here the metric-affine theories containing only the minimal degrees of freedom in the inflationary sector, i.e. the massless graviton and the inflaton. This theory contains the Ricci-like and parity-odd Holst invariants together with non-minimal couplings between the inflaton and the above-mentioned invariants. We show how the aforementioned setup can be used to generate a new class of inflationary attractors or to rescue previously ruled models like natural inflation and symmetry breaking inflation.