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Multipole moments and universal relations for scalarized neutron stars
George Pappas, Daniela D. Doneva, Thomas P. Sotiriou +2
In recent years there has been a surge of interest in what has come to be known as the `universal relations' between various global properties of neutron stars. These universal rel…
The modification of photon trapping orbits as a diagnostic of non-Kerr spacetimes
Kostas Glampedakis, George Pappas
Photon circular orbits, an extreme case of light deflection, are among the hallmarks of black holes and are known to play a central role in a variety of phenomena related to these…
Black holes, gravitational waves and fundamental physics: a roadmap
Leor Barack, Vitor Cardoso, Samaya Nissanke +203
The grand challenges of contemporary fundamental physics---dark matter, dark energy, vacuum energy, inflation and early universe cosmology, singularities and the hierarchy problem-…
On the connection of spacetime separability and spherical photon orbits
George Pappas, Kostas Glampedakis
The notion of non-equatorial spherical photon orbits is among the very special properties of the Kerr spacetime of rotating black holes and is one that leaves a clear mark on the e…