Universality in generalized models of inflation
Résumé
We discuss the cosmological evolution of a scalar field with non standard kinetic term in terms of a Renormalization Group Equation (RGE). In this framework inflation corresponds to the slow evolution in a neighborhood of a fixed point and universality classes for inflationary models naturally arise. Using some examples we show the application of the formalism. The predicted values for the speed of sound cs(2) and for the amount of non-Gaussianities produced in these models are discussed. In particular, we show that it is possible to introduce models with cs(2) ≠ 1 that can be in agreement with present cosmological observations.
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Binétruy_2017_J._Cosmol._Astropart._Phys._2017_060.pdf (833.14 Ko)
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