4 papers
Scalar Quasinormal modes in Reissner--Nordström black holes: implications for Weak Gravity Conjecture
Giorgio Di Russo, Anna Tokareva
Microscopic charged black holes can provide possibilities to test the consistency of the effective field theory (EFT) corrections to Einstein-Maxwell theory. A particularly interes…
Kerr spacetime and scalar wave equation: Exact resummation of the renormalized angular momentum in the eikonal limit
Donato Bini, Giorgio Di Russo, Andrea Geralico
We show that the null geodesic radial action for unbound orbits in the Kerr spacetime, and consequently the scattering angle, can be resummed in terms of hypergeometric functions,…
Non-spinning tops are stable
Iosif Bena, Giorgio Di Russo, Jose Francisco Morales +1
We consider coupled gravitational and electromagnetic perturbations of a family of five-dimensional Einstein-Maxwell solutions that describes both magnetized black strings and hori…
Charge (in)stability and superradiance of Topological Stars
Andrea Cipriani, Carlo Di Benedetto, Giorgio Di Russo +2
We study linear massive scalar charged perturbations of Topological Stars in the fuzzball and in the black hole (Black String) regimes. The objects that naturally couple to the ele…