Black hole superradiance is a fascinating process in general relativity and a unique window on ultralight particles beyond the standard model. Bosons  such as axions and dark photons  with Compton wavelengths comparable to size of astrophysical black holes grow exponentially to form large clouds spinning down the black hole in the process and produce monochromatic continuous gravitational wave radiation. In the era of gravitational wave astronomy and increasingly sensitive observations of astrophysical black holes and their properties superradiance of new light particles is a promising avenue to search for new physics in regimes inaccessible to terrestrial experiments. This workshop will bring together theorists data analysts and observers in particle physics gravitational wave astronomy strong gravity and high energy astrophysics to explore the signatures of black hole superradiance and to study the current and future possibilities of searching for new particles with black holes.
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Searching for Light Bosons with Black Hole Superradiance
Perimeter Institute for Theoretical Physics 

Superradiant instabilities and rotating black holes
University of Waterloo 
Measuring StellarMass Black Hole Spins via Xray Spectroscopy
Massachusetts Institute of Technology (MIT) 
Superradiance Beyond the Linear Regime
Princeton University 
Characterization of compact objects with present and future groundbased gravitationalwave detectors
Massachusetts Institute of Technology (MIT) 
LIGO and Virgo continuous wave searches  Overview and allsky searches
University of Michigan–Ann Arbor 
Directed and targeted searches for continuous gravitational waves
Albert Einstein Institute 
Where do black hole binaries come from, and can we actually know that?
Canadian Institute for Theoretical Astrophysics (CITA) 
Gravitational wave searches for ultralight bosons
Max Planck Institute for Gravitational Physics  Albert Einstein Institute (AEI) 