For rotating Einstein-Maxwell-scalar black holes, the weak-field light deflection angle is decomposed into an Einstein-Maxwell-dilaton part and a part linear in the stringy coupling β, with EHT data favoring β < 0.4 for spin 0.9.
Geodesics of Hayward black hole surrounded by quintessence
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abstract
Basing on the ideas used by Kiselev, we study the Hayward black hole surrounded by quintessence. By setting for the quintessence state parameter at the special case of $\omega=-\frac{2}{3}$, using the metric of the black hole surrounded by quintessence and the definition of the effective potential, we analyzed in detail the null geodesics for different energies. We also analyzed the horizons of the Hayward black hole surrounded by quintessence as well as the shadow of the black hole.
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Constrained Deflection Angle and Shadows of Rotating Black Holes in Einstein-Maxwell-scalar Theory
For rotating Einstein-Maxwell-scalar black holes, the weak-field light deflection angle is decomposed into an Einstein-Maxwell-dilaton part and a part linear in the stringy coupling β, with EHT data favoring β < 0.4 for spin 0.9.