A Regular Black Hole with a Core of Exotic Matter and a Portal to a Time-Free Domain

We propose a new regular black hole model that replaces the classical singularity with a smooth core of finite radius a. The metric is given by A(r) = 1 - (R_s r^3)/(r^4 + a^4), where R_s is the Schwarzschild radius and a = gamma R_s. The model predicts violation of energy conditions inside the core, the existence of exotic matter with negative pressure, and a transition to a white hole or a portal to a time-free domain. The shadow deviation from the Schwarzschild black hole is about 5–9%, which is testable with current EHT observations.