Photon Sphere for a Dilatonic Dyonic Black Hole in a Model with an Abelian Gauge Field and a Scalar Field

V. D. Ivashchuk, U. S. Kayumov, A. N. Malybayev +1

Dilatonic dyon black hole solution with gravitational radius $2\hat{I}¼$ and two charges $Q_1$ and $Q_2$ (electric and magnetic ones) in the gravitational $4d$ model with one scalar fie…