106 citations · 870 across the 18 of their papers we have counts for
20 papers
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…
Gravitational corrections to electroweak vacuum decay: metric vs. Palatini
Ioannis D. Gialamas, Alexandros Karam, Thomas D. Pappas
We consider the standard Einstein-Hilbert-Higgs action where the Higgs field couples nonminimally with gravity via the term , and investigate the stability of the…
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…
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…
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…