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Phenomenological Rotating Extension of Black Holes with Primary Scalar Hair: Shadow Signatures in Beyond Horndeski Gravity
cosmology-and-nongalactic-astrophysicsgeneral-relativity-and-quantum-cosmologyhigh-energy-physics-theory
The Event Horizon Telescope (EHT) image of M87* provides a direct test of strong-field gravity, measuring an angular shadow diameter $θ_{d}=42\pm 3~μ\mathrm{as}$ and a circularity deviation $ΔC\leq 0.1$. Such observations allow quantitative tests of the Kerr paradigm and of possible deviations from
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