148 citations · 1.2k across the 38 of their papers we have counts for
4 papers · 2 filters
Breaking black-hole uniqueness at supermassive scales
Astrid Eichhorn, Pedro G. S. Fernandes, Aaron Held +1
In general relativity, all vacuum black holes are described by the Kerr solution. Beyond general relativity, there is a prevailing expectation that deviations from the Kerr solutio…
Disentangling photon rings beyond General Relativity with future radio-telescope arrays
Raúl Carballo-Rubio, Héloïse Delaporte, Astrid Eichhorn +1
New physics beyond General Relativity can modify image features of black holes and horizonless spacetimes and increase the separation between photon rings. This motivates us to exp…
Nonlinear Evolution of Quadratic Gravity in 3+1 Dimensions
Aaron Held, Hyun Lim
We present a numerically stable system of (3+1) evolution equations for the nonlinear gravitational dynamics of quadratic-curvature corrections to General Relativity (Quadratic Gra…
Global and Local Stability for Ghosts Coupled to Positive Energy Degrees of Freedom
Cédric Deffayet, Aaron Held, Shinji Mukohyama +1
Negative kinetic energies correspond to ghost degrees of freedom, which are potentially of relevance for cosmology, quantum gravity, and high energy physics. We present a novel wid…