106 citations · 168 across the 7 of their papers we have counts for
4 papers · 1 filter
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…
Novel mechanism for CMB modulation in the Standard Model
Alexandros Karam, Tommi Markkanen, Luca Marzola +3
We demonstrate that light spectator fields can source sizeable CMB anisotropies through modulated reheating even in the absence of direct couplings to the inflaton. The effect aris…
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…
Equivalence of inflationary models between the metric and Palatini formulation of scalar-tensor theories
Laur Järv, Alexandros Karam, Aleksander Kozak +3
With a scalar field non-minimally coupled to curvature, the underlying geometry and variational principle of gravity - metric or Palatini - becomes important and makes a difference…