A
Alexandros Karam
Researcher at National Institute of Chemical Physics and Biophysics
Publications - 41
Citations - 1507
Alexandros Karam is an academic researcher from National Institute of Chemical Physics and Biophysics. The author has contributed to research in topics: Inflaton & Inflation (cosmology). The author has an hindex of 16, co-authored 33 publications receiving 1040 citations. Previous affiliations of Alexandros Karam include University of Ioannina.
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Dark matter and neutrino masses from a scale-invariant multi-Higgs portal
TL;DR: In this paper, the authors considered a classically scale invariant version of the Standard Model, extended by an extra dark $SU(2{)}_{X}$ gauge group.
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Dark matter from a classically scale-invariant S U ( 3 ) X
TL;DR: In this article, a classically scale-invariant extension of the Standard Model was studied, in which the dark matter and electroweak scales are generated through the Coleman-Weinberg mechanism.
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Palatini inflation in models with an $R^2$ term
Ignatios Antoniadis,Ignatios Antoniadis,Alexandros Karam,Angelos Lykkas,Kyriakos Tamvakis,Kyriakos Tamvakis +5 more
TL;DR: In this paper, the authors consider scalars, minimally or non-minimally coupled to the Starobinsky model, such as a quadratic model, the induced gravity model or the standard Higgs-like inflation model and analyze the corresponding modifications favorable to inflation.
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Frame-dependence of higher-order inflationary observables in scalar-tensor theories
TL;DR: In this paper, the authors compute the third-order corrected spectral indices in the slow-roll approximation for scalar and tensor perturbations in both the Einstein and Jordan frames.
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Rescuing quartic and natural inflation in the Palatini formalism
Ignatios Antoniadis,Ignatios Antoniadis,Alexandros Karam,Angelos Lykkas,Thomas Pappas,Kyriakos Tamvakis +5 more
TL;DR: In this paper, the Starobinsky model is considered in the Palatini formalism, and the minimally coupled quartic and natural inflation models are considered in their simplest realization.