Measurement of the spin of the M87 black hole from its observed twisted light. Simulating the emission and outflows from accretion disks. ipole-semi-analytic scheme for relativistic polarized radiative transport. et al.) 45 (Astrophysics and Space Science Library Vol. in The Formation and Disruption of Black Hole Jets (eds Contopoulos, I. General relativistic magnetohydrodynamic simulations of magnetically choked accretion flows around black holes. Magnetically arrested disk: an energetically efficient accretion flow. Three-dimensional MHD simulations of radiatively inefficient accretion flows. Probing the innermost accretion flow geometry of Sgr A ⋆ with Event Horizon Telescope. Geometric optics in the presence of axionlike particles in curved spacetime. Instability of the massive Klein–Gordon field on the Kerr spacetime. Exploring the string axiverse with precision black hole physics. Black hole superradiance of self-interacting scalar fields. Gravitational radiation from an axion cloud around a black hole: superradiant phase. Bosenova collapse of axion cloud around a rotating black hole. Effects of a Nambu–Goldstone boson on the polarization of radio galaxies and the cosmic microwave background. Limits on a Lorentz and parity violating modification of electrodynamics. Floating orbits, superradiant scattering and the black-hole bomb. Extraction of rotational energy from a black hole. Probing axions with Event Horizon Telescope polarimetric measurements. A cosmological bound on the invisible axion. Problem of strong P and T invariance in the presence of instantons. Constraints imposed by CP conservation in the presence of instantons. CP conservation in the presence of instantons. Magnetic field structure near the event horizon. First M87 Event Horizon Telescope results. 910, L12 (2021).Įvent Horizon Telescope Collaborationet al.
875, L5 (2019).Įvent Horizon Telescope Collaborationet al. 875, L6 (2019).Įvent Horizon Telescope Collaborationet al. The shadow and mass of the central black hole. 875, L4 (2019).Įvent Horizon Telescope Collaborationet al. Imaging the central supermassive black hole. 875, L1 (2019).Įvent Horizon Telescope Collaborationet al. The shadow of the supermassive black hole. We propose a novel differential analysis procedure to reduce the astrophysical background, and derive stringent constraints on the existence of axions in the previously unexplored mass window of ~(10 −21–10 −20) eV.Įvent Horizon Telescope Collaborationet al. In this paper, we leverage the azimuthal distribution of electric vector position angle measured by the Event Horizon Telescope to study the axion–photon coupling. For the nearly face-on M87 ⋆, this oscillation in the electric vector position angle appears as a propagating wave along the photon ring. The presence of an axion cloud leads to a frequency-independent oscillation in the electric vector position angle of this linear polarization. Recently, the linear polarization of radiation emitted near the supermassive black hole M87 ⋆ was measured on four separate days, precisely enabling tests of the existence of a dense axion cloud produced by a spinning black hole. The hitherto unprecedented angular resolution of the Event Horizon Telescope has created exciting opportunities in the search for new physics.
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