106 citations · 870 across the 18 of their papers we have counts for
3 papers · 1 filter
Single-field inflation in models with an term
Ignatios Antoniadis, Alexandros Karam, Angelos Lykkas +2
We present two cases where the addition of the term to an inflationary model leads to single-field inflation instead of two-field inflation as is usually the case. In both ca…
Einstein-scalar-Gauss-Bonnet black holes: Analytical approximation for the metric and applications to calculations of shadows
Roman A. Konoplya, Thomas Pappas, Alexander Zhidenko
Recently, numerical solutions to the field equations of Einstein-scalar-Gauss-Bonnet gravity that correspond to black-holes with non-trivial scalar hair have been reported. Here, w…
Frame-dependence of inflationary observables in scalar-tensor gravity
Alexandros Karam, Thomas Pappas, Kyriakos Tamvakis
By means of the Green's function method, we computed the spectral indices up to third order in the slow-roll approximation for a general scalar-tensor theory in both the Einstein a…