7 papers
Bridging Superfluid and Nonminimally Coupled BEC Dark Matter through RAQUAL
Stefano Liberati, Valentin Pomakov, Samuele Silveravalle
The paper examines how superfluid dark matter (SFDM) can be derived as the Newtonian, low‑acceleration limit of a relativistic RAQUAL theory and maps its interaction sector onto th…
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…
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…
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…
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…