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Black Holes in a Gravitational Field: The Non-linear Static Love Number of Schwarzschild Black Holes Vanishes
Alex Kehagias, Antonio Riotto
We show that the static tidal Love number of Schwarzschild black holes in four dimensions and in the vacuum vanishes at any order in the external tidal force. We also identify the…
Flea on the elephant: Tidal Love numbers in subsolar primordial black hole searches
Valerio De Luca, Gabriele Franciolini, Antonio Riotto
Detecting subsolar objects in black hole binary mergers is considered a smoking gun signature of primordial black holes. Their supposedly vanishing tidal Love number is generically…
A Short Note on the Love Number of Extremal Reissner-Nordstrom and Kerr-Newman Black Holes
Alex Kehagias, Davide Perrone, Antonio Riotto
We provide a simple proof of why the Love number vanishes for extremal Reissner-Nordstrom and Kerr-Newman black holes. The argument is based on a conformal inversion isometry of th…
Curbing PBHs with PTAs
A. J. Iovino, G. Perna, A. Riotto +1
Sizeable primordial curvature perturbations needed to seed a population of primordial black holes (PBHs) will be accompanied by a scalar-induced gravitational wave signal that can…
Why the Universal Threshold for Primordial Black Hole Formation is Universal
Alex Kehagias, Davide Perrone, Antonio Riotto
We show why the threshold for primordial black hole formation is universal (independent from the shape of the perturbation) when expressed in terms of the volume averaged compactio…
The Black Hole Formation -- Null Geodesic Correspondence
Andrea Ianniccari, Antonio J. Iovino, Alex Kehagias +2
We provide evidence for a correspondence between the formation of black holes and the stability of circular null geodesics around the collapsing perturbation. We first show that th…