106 citations · 168 across the 7 of their papers we have counts for
4 papers · 1 filter
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…
Higgs-like spectator field as the origin of structure
Alexandros Karam, Tommi Markkanen, Luca Marzola +3
We show that the observed primordial perturbations can be entirely sourced by a light spectator scalar field with a quartic potential, akin to the Higgs boson, provided that the fi…
-function reconstruction of Palatini inflationary attractors
Alexandros Karam, Sotirios Karamitsos, Margus Saal
Attractor inflation is a particularly robust framework for developing inflationary models that are insensitive to the details of the potential. Such models are most often considere…
Tachyonic Preheating in Palatini Inflation
Alexandros Karam, Eemeli Tomberg, Hardi Veermäe
We study preheating in the Palatini formalism with a quadratic inflaton potential and an added term. In such models, the oscillating inflaton field repeatedly returns to the…