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Odd gravitational waves from inflation

by Lorenzo Sorbo (U. Mass.)

4-2-011 - TH common room (CERN)

4-2-011 - TH common room


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The existence of a primordial spectrum of gravitational waves is a generic prediction of inflation, and several CMB experiments are going after this signature. Here I will discuss how the coupling of a pseudoscalar inflaton to a gauge field can induce, in a two-step process, gravitational waves with unusual properties such as: (i) a net chirality (ii) a blue spectrum (iii) being detectable in the (relatively) near future by ground-based gravitational interferometers (iv) large nongaussianities even if the scalar perturbations are approximately gaussian.