For asymptotically flat regular black holes in phantom DBI gravity, the photon sphere, Lyapunov exponent, and derived observables coincide exactly with Schwarzschild values at fixed coordinate radius and are controlled by a single dimensionless core-size function.
Analytic Expressions for Quasinormal Modes of a Regular Black Hole Sourced by a Dehnen-Type Halo.Int
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Eikonal Ringing, Shadows, Lensing, Grey-Body Factors, and Binding Energy of Asymptotically Flat Regular Black Holes in Phantom Dirac-Born-Infeld Gravity
For asymptotically flat regular black holes in phantom DBI gravity, the photon sphere, Lyapunov exponent, and derived observables coincide exactly with Schwarzschild values at fixed coordinate radius and are controlled by a single dimensionless core-size function.