432 citations · 3.2k across the 70 of their papers we have counts for
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Rescuing Quartic and Natural Inflation in the Palatini Formalism
I. Antoniadis, A. Karam, A. Lykkas +2
When considered in the Palatini formalism, the Starobinsky model does not provide us with a mechanism for inflation due to the absence of a propagating scalar degree of freedom. By…
Palatini inflation in models with an term
I. Antoniadis, A. Karam, A. Lykkas +1
The Starobinsky model, considered in the framework of the Palatini formalism, in contrast to the metric formulation, does not provide us with a model for inflation, due to the abse…
Nonminimal Coleman--Weinberg Inflation with an term
Alexandros Karam, Thomas Pappas, Kyriakos Tamvakis
We extend the Coleman--Weinberg inflationary model where a scalar field is non-minimally coupled to gravity with the addition of the term. We express the theory in terms…
Frame-invariant approach to higher-dimensional scalar-tensor gravity
Alexandros Karam, Angelos Lykkas, Kyriakos Tamvakis
The recent interest in modified theories of gravity, involving some type of non-minimal coupling to the Ricci scalar, and the calculation of cosmological observables in the Einstei…