Near-horizon synchrotron polarization in Kerr spacetime admits a distinct analytic form where the leading-order pattern depends only on spin and polar angle under stationary axisymmetric degenerate EM field assumptions.
Polarized image of a synchrotron-emitting ring in an Einstein-Maxwell-scalar theory,
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Numerical backward ray-tracing shows that the inner shadow size shrinks with the Gauss-Bonnet coupling while polarization direction near the shadow and photon ring shifts noticeably, and combining both observables yields stronger constraints than either alone.
Hairy black hole shadows and disks grow with horizon scalar value but can mimic Schwarzschild by adjusting horizon radius, with the potential parameter Lambda constrained by supermassive black hole observations.
citing papers explorer
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Distinct Near-Horizon Trend of Synchrotron Polarization in Kerr Spacetime
Near-horizon synchrotron polarization in Kerr spacetime admits a distinct analytic form where the leading-order pattern depends only on spin and polar angle under stationary axisymmetric degenerate EM field assumptions.
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Unveiling Inner Shadows and Polarization Signatures of Rotating Einstein-Gauss-Bonnet Black Holes
Numerical backward ray-tracing shows that the inner shadow size shrinks with the Gauss-Bonnet coupling while polarization direction near the shadow and photon ring shifts noticeably, and combining both observables yields stronger constraints than either alone.
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Shadow of the Scalar Hairy Black Hole with Inverted Higgs Potential
Hairy black hole shadows and disks grow with horizon scalar value but can mimic Schwarzschild by adjusting horizon radius, with the potential parameter Lambda constrained by supermassive black hole observations.