Abstract Using the Keeton and Petters approach, we determine the deflection angle. We
also investigate the motion of photons around a parameterized black hole in the presence of …

We investigate modified theories of gravity in the context of teleparallel geometries. It is well
known that modified gravity models based on the torsion scalar are not invariant under local …

We present a new understanding of the unstable ghostlike resonance which appears in
theories such as quadratic gravity and Lee-Wick type theories. Quantum corrections make …

A bstract Asymptotic Safety provides an elegant mechanism for obtaining a consistent high-
energy completion of gravity and gravity-matter systems. Following the initial idea by Steven …

Throughout the study of the geodesics of some popular spherically symmetric regular black
holes, we hereby prove that the analytically extended Hayward black hole is geodetically …

A bstract The “fakeon” is a fake degree of freedom, ie a degree of freedom that does not
belong to the physical spectrum, but propagates inside the Feynman diagrams. Fakeons can …

A bstract Resumming quantum fluctuations at the level of the gravitational path integral is
expected to result in non-local effective actions and thus in a non-trivial momentum …

A bstract The Lee-Wick models are higher-derivative theories that are claimed to be unitary
thanks to a peculiar cancelation mechanism. In this paper, we provide a new formulation of …

We propose a class of multidimensional higher derivative theories of gravity without extra
real degrees of freedom besides the graviton field. The propagator shows up the usual real …

A bstract The R 2 inflation which is an extension of general relativity (GR) by quadratic scalar
curvature introduces a quasi-de Sitter expansion of the early Universe governed by Ricci …