47 citations · 201 across the 9 of their papers we have counts for
9 papers
On the stability of scale-invariant black holes
Simon Boudet, Massimiliano Rinaldi, Samuele Marco Silveravalle
Quadratic scale-invariant gravity non minimally coupled to a scalar field provides a competitive model for inflation, characterized by the transition from an unstable to a stable f…
Landau damping for gravitational waves in parity-violating theories
Flavio Bombacigno, Fabio Moretti, Simon Boudet +1
We discuss how tensor polarizations of gravitational waves can suffer Landau damping in the presence of velocity birefringence, when parity symmetry is explicitly broken. In partic…
Torsional birefringence in metric-affine Chern-Simons gravity: gravitational waves in late-time cosmology
S. Boudet, F. Bombacigno, F. Moretti +1
In the context of the metric-affine Chern-Simons gravity endowed with projective invariance, we derive analytical solutions for torsion and nonmetricity in the homogeneous and isot…
Quasinormal modes of Schwarzschild black holes in projective invariant Chern-Simons modified gravity
Simon Boudet, Flavio Bombacigno, Gonzalo J. Olmo +1
We generalize the Chern-Simons modified gravity to the metric-affine case and impose projective invariance by supplementing the Pontryagin density with homothetic curvature terms w…
The Immirzi field in modified gravity: superentropic black holes with scalar hair
Simon Boudet
In the context of f(R) generalizations to the Holst action, endowed with a dynamical Immirzi field, we derive an analytic solution describing asymptotically anti-de Sitter black ho…
Big-Bounce in projectively invariant Nieh-Yan models: the Bianchi I case
Flavio Bombacigno, Simon Boudet, Gonzalo J. Olmo +1
We show that the Nieh-Yan topological invariant breaks projective symmetry and loses its topological character in presence of non vanishing nonmetricity. The notion of the Nieh-Yan…
Big-bounce and future time singularity resolution in Bianchi I: the projective invariant Nieh-Yan case
Flavio Bombacigno, Simon Boudet, Gonzalo J. Olmo +1
We extend the notion of the Nieh-Yan invariant to generic metric-affine geometries, where both torsion and nonmetricity are taken into account. Notably, we show that the properties…
Super-entropic black hole with Immirzi hair
Simon Boudet, Flavio Bombacigno, Giovanni Montani +1
In the context of f(R) generalizations to the Holst action, endowed with a dynamical Immirzi field, we derive an analytic solution describing asymptotically Anti-de Sitter black ho…
Generalized Ashtekar variables for Palatini f(R) models
Flavio Bombacigno, Simon Boudet, Giovanni Montani
We consider special classes of Palatini f(R) theories, featured by additional Loop Quantum Gravity inspired terms, with the aim of identifying a set of modified Ashtekar canonical…