4 papers
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…