Speaker
Thomas Pappas
(Research Centre for Theoretical Physics and Astrophysics, Institute of Physics, Silesian University in Opava)
Description
We demonstrate how the inclusion of a R^2 term and the use of the Palatini formalism allows models of inflation that have been excluded by the Planck data in their simplest realizations to become viable once again. We also discuss how the inclusion of a non-minimal derivative coupling term in the action allows the predictions of Palatini-Higgs inflation to be in contact with observations in the near future. Finally, in the framework of Palatini quadratic gravity we construct a two-field scalar-tensor theory that is classically scale invariant and complies with the latest bounds set by the Planck collaboration for a wide range of parameters.
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Primary author
Thomas Pappas
(Research Centre for Theoretical Physics and Astrophysics, Institute of Physics, Silesian University in Opava)