106 citations · 185 across the 5 of their papers we have counts for
12 papers · 1 filter
Greybody factors in scalar-tensor gravity and beyond
Georgios Antoniou, Thomas D. Pappas, Panagiota Kanti
In the framework of the beyond Horndeski action, we consider three subtheories that support scalarised black-hole solutions, and look for modified characteristics compared to GR. W…
Implications of Palatini gravity for inflation and beyond
Ioannis D. Gialamas, Alexandros Karam, Thomas D. Pappas +1
We present an introduction to cosmic inflation in the framework of Palatini gravity, which provides an intriguing alternative to the conventional metric formulation of gravity. In…
Extended Tolman III and VII solutions in gravity: Models for neutron stars and supermassive stars
Thomas D. Pappas, Camilo Posada, Zdeněk Stuchlík
In the context of linear gravity, where is the Ricci scalar, is the trace of the energy-momentum tensor, and is a dimensionl…
General parametrization of wormhole spacetimes and its application to shadows and quasinormal modes
Kirill A. Bronnikov, Roman A. Konoplya, Thomas D. Pappas
The general parametrization for spacetimes of spherically symmetric Lorentzian, traversable wormholes in an arbitrary metric theory of gravity is presented. The parametrization is…
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…
General parametrization of higher-dimensional black holes and its application to Einstein-Lovelock theory
Roman A. Konoplya, Thomas D. Pappas, Zdenek Stuchlík
Here we have developed the general parametrization for spherically symmetric and asymptotically flat black-hole spacetimes in an arbitrary metric theory of gravity. The parametriza…