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Stress-energy tensor correlations across regular black holes horizons
Matteo Fontana, Massimiliano Rinaldi
Hawking radiation can be regarded as a spontaneous and continuous creation of virtual particle-antiparticle pairs outside the event horizon of a black hole where strong tidal force…
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…
Inflation and primordial gravitational waves in scale-invariant quadratic gravity with Higgs
Anish Ghoshal, Debangshu Mukherjee, Massimiliano Rinaldi
In scale-invariant models of fundamental physics all mass scales are generated via spontaneous symmetry breaking. In this work, we study inflation in scale-invariant quadratic grav…
Vacuum decay and quadratic gravity: the massive case
Silvia Vicentini, Massimiliano Rinaldi
False vacuum decay in field theory may be formulated as a boundary value problem in Euclidean space. In a previous work, we studied its solution in single scalar field theories wit…
Non-Singular Black Holes and mass inflation in modified gravity
Manuel Bertipagani, Massimiliano Rinaldi, Lorenzo Sebastiani +1
We analytically derive a class of non-singular, static and spherically symmetric topological black hole metrics inF(R)-gravity. These have not a de Sitter core at their centre, as…
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…
Vacuum decay in quadratic gravity
Silvia Vicentini, Massimiliano Rinaldi
Metastable states decay at zero temperature through quantum tunneling at an exponentially small rate, which depends on the Coleman-de Luccia instanton, also known as bounce. In som…
A note on the linear stability of black holes in quadratic gravity
Christian Dioguardi, Massimiliano Rinaldi
Black holes in -gravity are known to be unstable, especially the rotating ones. In particular, an instability develops that looks like the classical black hole bomb mechanism…
Regularized Lovelock gravity
Alessandro Casalino, Aimeric Colleaux, Massimiliano Rinaldi +1
A four-dimensional regularization of Lovelock-Lanczos gravity up to an arbitrary curvature order is considered. We show that Lovelock-Lanczos terms can provide a non-trivial contri…
Scale-invariant inflation with one-loop quantum corrections
Silvia Vicentini, Luciano Vanzo, Massimiliano Rinaldi
We study quantum corrections to an inflationary model, which has the attractive feature of being classically scale-invariant. In this model, quadratic gravity plays along a scalar…
Alive and well: mimetic gravity and a higher-order extension in light of GW170817
Alessandro Casalino, Massimiliano Rinaldi, Lorenzo Sebastiani +1
The near-simultaneous multi-messenger detection of the gravitational wave (GW) event GW170817 and its optical counterpart, the short -ray burst GRB170817A, implies that deviatio…
On the equivalence of Jordan and Einstein frames in scale-invariant gravity
Massimiliano Rinaldi
In this note we consider the issue of the classical equivalence of scale-invariant gravity in the Einstein and in the Jordan frames. We first consider the simplest example $f(R)=R^…
Testing Horndeski gravity as dark matter with $\texttt{hi_class}$
Alessandro Casalino, Massimiliano Rinaldi
We consider a model of dark matter fluid based on a sector of Horndeski gravity. The model is very successful, at the background level, in reproducing the evolution of the Universe…
Mimicking dark matter and dark energy in a mimetic model compatible with GW170817
Alessandro Casalino, Massimiliano Rinaldi, Lorenzo Sebastiani +1
The recent observation of the the gravitational wave event GW170817 and of its electromagnetic counterpart GRB170817A, from a binary neutron star merger, has established that the s…
A special class of solutions in -gravity
Marco Calzà, Massimiliano Rinaldi, Lorenzo Sebastiani
We consider a special class of vacuum -modified gravity models. The form of their Lagrangian is such that the field equations are trivially satisfied when the Ricci scalar is…
Inflation and reheating in scale-invariant scalar-tensor gravity
Giovanni Tambalo, Massimiliano Rinaldi
We consider the scale-invariant inflationary model studied in [1]. The Lagrangian includes all the scale-invariant operators that can be built with combinations of , and o…
Static and rotating solutions for Vector-Galileon theories
Adolfo Cisterna, Mokhtar Hassaine, Julio Oliva +1
We consider a particular truncation of the generalized Proca field theory in four dimensions for which we construct a static and axisymmetric rotating black hole "stealth solutions…
Mimicking dark matter in Horndeski gravity
Massimiliano Rinaldi
Since the rediscovery of Horndeski gravity, a lot of work has been devoted to the exploration of its properties, especially in the context of dark energy. However, one sector of th…
Slowly rotating neutron stars in the nonminimal derivative coupling sector of Horndeski gravity
Adolfo Cisterna, Térence Delsate, Ludovic Ducobu +1
This work is devoted to the construction of slowly rotating neutron stars in the framework of the nonminimal derivative coupling sector of Horndeski theory. We match the large radi…
Inflation and reheating in theories with spontaneous scale invariance symmetry breaking
Massimiliano Rinaldi, Luciano Vanzo
We study a scale-invariant model of quadratic gravity with a non-minimally coupled scalar field. We focus on cosmological solutions and find that scale invariance is spontaneously…
Dark energy as a fixed point of the Einstein Yang-Mills Higgs Equations
Massimiliano Rinaldi
We study the Einstein Yang-Mills Higgs equations in the representation on a isotropic and homogeneous flat Universe, in the presence of radiation and matter fluids. We map…
Scale-invariant rotating black holes in quadratic gravity
Guido Cognola, Massimiliano Rinaldi, Luciano Vanzo
Black hole solutions in pure quadratic theories of gravity are interesting since they allow to formulate a set of scale-invariant thermodynamics laws. Recently, we have proven that…
Quasi Scale-Invariant Inflationary Attractors
Massimiliano Rinaldi
We show that pure quadratic gravity with quantum loop corrections yields a viable inflationary scenario. We also show that a large family of models in the Jordan frame, with softly…
Thermodynamics of topological black holes in gravity
Guido Cognola, Massimiliano Rinaldi, Luciano Vanzo +1
We study topological black hole solutions of the simplest quadratic gravity action and we find that two classes are allowed. The first is asymptotically flat and mimics the Reissne…