Inspiraling hotspots near Kerr black holes produce precessing, unwinding Stokes Q-U polarization loops, unlike the closed loops of stable circular orbits.
Polarized signatures of orbiting hot spots: Special relativity impact and probe of spacetime curvature
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Fitting GRAVITY flare astrometry to solitonic boson star models requires masses larger than 4.3 million solar masses, with more diffuse models yielding values closer to the standard black hole mass and thus placing stringent but incomplete constraints on such interpretations of Sgr A*.
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Polarization Signatures of Inspiraling Hotspots around Kerr Black Holes
Inspiraling hotspots near Kerr black holes produce precessing, unwinding Stokes Q-U polarization loops, unlike the closed loops of stable circular orbits.
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Testing solitonic boson star interpretations of Sagittarius A* with near-infrared flare astrometry
Fitting GRAVITY flare astrometry to solitonic boson star models requires masses larger than 4.3 million solar masses, with more diffuse models yielding values closer to the standard black hole mass and thus placing stringent but incomplete constraints on such interpretations of Sgr A*.