In f(R) gravity, the photon sphere and shadow radii are scaled by 1/F and further modified by the constant curvature R_dS, changing their size relative to general relativity.
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Variation in the size of the Photon Sphere and Black Hole Shadow in the Modified Gravity
In f(R) gravity, the photon sphere and shadow radii are scaled by 1/F and further modified by the constant curvature R_dS, changing their size relative to general relativity.