400 citations · 7k across the 150 of their papers we have counts for
152 papers
Scalar Gauss-Bonnet Wormholes and the Imaginary Distance Bound
Alex Kehagias, Antonio Riotto
We study symmetric Euclidean wormholes in four-dimensional gravity with a massless scalar linearly coupled to the Gauss-Bonnet invariant. At nonzero coupling, the Einstein w…
Information--Theoretic Black Hole Entropy II: Infrared Gravity and Charged/Rotating Extensions
Alex Kehagias
We investigate gravitational and Kerr-Newman extensions of an information-theoretic black-hole entropy that satisfies the Nernst formulation of the third law of thermodynamics. The…
Information-Theoretic Black Hole Entropy I: Beyond the Area Law
Alex Kehagias
Although the Bekenstein-Hawking area law is consistent with the first and second laws of black hole thermodynamics, it appears to be in conflict with the third law, which in the Ne…
On Global Symmetries and Fayet-Iliopoulos Terms
Fotis Farakos, Alex Kehagias, Nikolaos Liatsos
We revisit the genuine Fayet-Iliopoulos terms of 4D N=1 supergravity. Such terms are commonly believed to preserve a global symmetry, and therefore they are in conflict with the pr…
The PTA Hellings and Downs Correlation Unmasked by Symmetries
Alex Kehagias, Antonio Riotto
The Hellings and Downs correlation curve describes the correlation of the timing residuals from pairs of pulsars as a function of their angular separation on the sky and is a smoki…
Renormalized Primordial Black Holes
Gabriele Franciolini, Andrea Ianniccari, Alex Kehagias +2
The formation of primordial black holes in the early universe may happen through the collapse of large curvature perturbations generated during a non-attractor phase of inflation o…