48 citations · 108 across the 16 of their papers we have counts for
17 papers
Bridging Superfluid and Nonminimally Coupled BEC Dark Matter through RAQUAL
Stefano Liberati, Valentin Pomakov, Samuele Silveravalle
Motivated by their common condensed-matter inspiration and their shared aim of reconciling MOND-like phenomenology on galactic scales with particle dark matter on larger scales, we…
Cosmology with a Non-minimally Coupled Dark Matter Fluid II. Cosmological Perturbations
Samuele Silveravalle, Andrea Lapi, Francesco Benetti +1
We extend our study of a cosmological scenario in which dark matter is non-minimally coupled to gravity at the fluid level. In previous work, we showed that this interaction can dr…
Veiled Singularities in Einstein-Weyl Gravity: Stability and Physical Interpretation of Horizonless Solutions
Alfio M. Bonanno, Samuele Silveravalle, Andrea Spina
We investigate a class of horizonless solutions in Einstein-Weyl gravity, corresponding to the so-called attractive naked singularities of the (-2,2) type. In contrast to General R…
Charting GLOBs in Asymptotically Safe Gravity
Francesco Del Porro, Jonas Pfeiffer, Alessia Platania +1
Computing the gravitational effective action provides a direct route to charting the landscape of admissible black hole spacetimes and their alternatives, which we will collectivel…
Cosmology with a Non-minimally Coupled Dark Matter Fluid I. Background Evolution
Samuele Silveravalle, Andrea Lapi, Francesco Benetti +1
We explore a cosmological model in which dark matter is non-minimally coupled to gravity at the fluid level. While typically subdominant compared to Standard Model forces, such cou…
Spontaneous ghostification: how a dying black hole comes back as a naked singularity
Alfio Bonanno, Samuele Silveravalle
A quantum ghost that destabilizes the Schwarzschild solution, transforming it into a naked singularity, may seem like a physicist's worst nightmare. However, we argue that this sce…
Ghost-induced phase transition in the final stages of black hole evaporation
Alfio Bonanno, Samuele Silveravalle
We explore a novel scenario in which a quantum-induced ghost instability drives the natural evolution of an evaporating Schwarzschild black hole toward a stable naked singularity.…
A Relativistic Tensorial Model for Fractional Interaction between Dark Matter and Gravity
Francesco Benetti, Andrea Lapi, Samuele Silveravalle +5
In a series of recent papers it was shown that several aspects of Dark Matter (DM) phenomenology, such as the velocity profiles of individual dwarfs and spiral galaxies, the scalin…
Ultra-compact Objects of Non-minimally Coupled Dark Matter
Francesco Benetti, Andrea Lapi, Samuele Silveravalle +1
In the framework of a collisionless dark matter fluid which is non-minimally coupled to gravity, we investigate the existence and properties of static, spherically symmetric soluti…
Scalar Perturbations of Regular Black Holes derived from a Non-Singular Collapse Model in Asymptotic Safety
Andrea Spina, Samuele Silveravalle, Alfio Bonanno
We investigate the massless scalar field perturbations, focusing on the quasinormal modes spectrum and the ringdown waveform of regular black hole spacetimes derived within the Asy…
Black holes at a crossroads: late-stage evaporation in quadratic gravity
Alfio Bonanno, Samuele Silveravalle
In General Relativity black hole evaporation leads to sudden bursts of energy and loss of information. It can be argued that these phenomena happen in the final stages of evaporati…
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…
The phase diagram of Einstein-Weyl gravity
Samuele Silveravalle, Alessandro Zuccotti
Thanks to their interpretation as first order correction of General Relativity at high energies, quadratic theories of gravity gained much attention in recent times. Particular att…
Non-symmetric wormholes and localized Big Rip singularities in Einstein-Weyl gravity
Alfio Bonanno, Samuele Silveravalle, Alessandro Zuccotti
The inclusion of the Weyl squared term in the gravitational action is one of the most simple, yet non trivial modifications to General Relativity at high energies. Nevertheless the…
The gravitational field of isolated objects in quadratic gravity
Samuele Silveravalle
When describing gravity at high energies it is natural to introduce terms quadratic in the curvature as first corrections to the Einstein-Hilbert action. Static, spherically symmet…
The gravitational field of a star in quadratic gravity
Alfio Bonanno, Samuele Silveravalle
The characterization of the gravitational field of isolated objects is still an open question in quadratic theories of gravity. We study static equilibrium solutions for a self-gra…
Characterizing black hole metrics in quadratic gravity
Alfio Bonanno, Samuele Silveravalle
The recent discovery of non-Schwarzschild black hole spacetimes has opened new directions of research in higher-derivative gravitational theories. However, despite intense analytic…