401 citations · 4.1k across the 78 of their papers we have counts for
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Dark photon superradiance: Electrodynamics and multimessenger signals
Nils Siemonsen, Cristina Mondino, Daniel Egana-Ugrinovic +3
We study the electrodynamics of a kinetically mixed dark photon cloud that forms through superradiance around a spinning black hole, and design strategies to search for the resulti…
Starting inflation from inhomogeneous initial conditions with momentum
Maxence Corman, William E. East
We investigate the circumstances under which cosmic inflation can arise from very inhomogeneous initial conditions using numerical relativity simulations. Previous studies have not…
SuperRad: Modeling the black hole superradiance gravitational waveform
Nils Siemonsen, Taillte May, William E. East
Gravitational signatures of black hole superradiance are a unique probe of ultralight particles that are weakly-coupled to ordinary matter. The existence of an ultralight boson wou…
Nonlinear studies of binary black hole mergers in Einstein-scalar-Gauss-Bonnet gravity
Maxence Corman, Justin L. Ripley, William E. East
We study the nonlinear dynamics of binary black hole systems with scalar charge by numerically evolving the full equations of motion for shift-symmetric Einstein scalar Gauss-Bonne…
Binary neutron star mergers in Einstein-scalar-Gauss-Bonnet gravity
William E. East, Frans Pretorius
Binary neutron star mergers, which can lead to less massive black holes relative to other known astrophysical channels, have the potential to probe modifications to general relativ…
Dark photon vortex formation and dynamics
William E. East, Junwu Huang
We study the formation and evolution of vortices in dark photon dark matter and dark photon clouds that arise through black hole superradiance. We show how the production of…