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Signatures of Black Hole Spin in Horizon-Scale Polarimetry
George N. Wong, Daniel C. M. Palumbo, Zachary Gelles +1
The angular momentum of a black hole, usually expressed in terms of a dimensionless "spin," both shapes the strong-field spacetime and provides a reservoir of rotational energy tha…
Black Hole Polarimetry: Universal Polarization of Synchrotron Radiation at the Horizon
Andrew Chael, Alexandru Lupsasca, George N. Wong +2
Polarized images of a black hole encode the direction of electromagnetic energy flow near its event horizon. Measuring polarization from near-horizon emission can help determine wh…
A Nonlinear Endpoint of Charged Horizon Instabilities
Zachary Gelles, Frans Pretorius
We numerically construct asymptotically extremal black holes through the nonlinear evolution of a charged scalar field. Our procedure -- which extends the work of Murata-Reall-Tana…
Signatures of Black Hole Spin and Plasma Acceleration in Jet Polarimetry II: Off-Axis Jets
Zachary Gelles, Andrew Chael, Eliot Quataert
We analyze the polarization of optically thin, stationary, axisymmetric black hole jets at scales of order the light cylinder radius. Our work generalizes the face-on results of Ge…