Simon Boudet
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On the stability of scale-invariant black holes Open
A bstract 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 fixed point, both characterized by constant scalar…
On the stability of scale-invariant black holes Open
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 fixed point, both characterized by constant scalar field con…
Landau damping for gravitational waves in parity-violating theories Open
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 particular, we analyze the role of the Nieh-Yan and Chern-Simons …
Torsional birefringence in metric-affine Chern-Simons gravity: gravitational waves in late-time cosmology Open
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 isotropic cosmological case, described by a flat Friedmann-Robe…
Quasinormal modes of Schwarzschild black holes in projective invariant Chern-Simons modified gravity Open
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 which do not spoil topologicity. The latter is then broken b…
The Immirzi field in modified gravity: superentropic black holes with scalar hair Open
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 holes with hyperbolic horizon. These exhibit a scalar hair of…
Big-Bounce in projectively invariant Nieh-Yan models: the Bianchi I case Open
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 topological invariant is then extended to the generic metr…
Big bounce and future time singularity resolution in Bianchi I cosmologies: The projective invariant Nieh-Yan case Open
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 of projective invariance and topologicity can be independe…
Superentropic black hole with Immirzi hair Open
In the context of f(R) generalizations to the Holst action, endowed with a\ndynamical Immirzi field, we derive an analytic solution describing\nasymptotically Anti-de Sitter black holes with hyperbolic horizon. These\nexhibit a scalar hair…