7 papers
Gravitino thermal production
Helmut Eberl, Ioannis D. Gialamas, Vassilis C. Spanos
In this talk we present a new calculation of the gravitino production rate, using its full one-loop corrected thermal self-energy, beyond the hard thermal loop approximation. Gravi…
Scale-Invariant Quadratic Gravity and Inflation in the Palatini Formalism
Ioannis D. Gialamas, Alexandros Karam, Thomas D. Pappas +1
In the framework of classical scale invariance, we consider quadratic gravity in the Palatini formalism and investigate the inflationary predictions of the theory. Our model corres…
Gravitino thermal production revisited
Helmut Eberl, Ioannis D. Gialamas, Vassilis C. Spanos
We calculate the gravitino production rate, computing its one-loop thermal self-energy. Gravitino production processes that do not result through thermal cuts of its self-energy, h…
Palatini-Higgs inflation with non-minimal derivative coupling
Ioannis D. Gialamas, Alexandros Karam, Angelos Lykkas +1
The predictions of standard Higgs inflation in the framework of the metric formalism yield a tensor-to-scalar ratio which lies well within the expected accuracy of…
Dynamically induced Planck scale and inflation in the Palatini formulation
Ioannis D. Gialamas, Alexandros Karam, Antonio Racioppi
We study non-minimal Coleman-Weinberg inflation in the Palatini formulation of gravity in the presence of an term. The Planck scale is dynamically generated by the vacuum exp…
Reheating in Palatini inflationary models
Ioannis D. Gialamas, A. B. Lahanas
We consider inflation in the Palatini gravity assuming the existence of scalar fields, coupled to gravity in the most general manner. These theories, in the Einstein frame, a…