Corrected thermodynamics and radiation predictions of modified black bounce compact objects

Abstract

We study the thermodynamic properties and radiation characteristics of a regular compact object obtained by applying the Simpson-Visser regularisation to the Schwarzschild black hole in modified gravity. The resulting SV-MOG spacetime, whose lapse function involves both the MOG coupling parameter and the black bounce parameter, smoothly interpolates between a regular black hole, a one-way wormhole, and a traversable wormhole depending on the parameter. We derive the Hawking temperature and heat capacity for both the black hole and wormhole branches, identifying second-order phase transitions signaled by sign changes in the heat capacity. Quantum gravitational corrections to the entropy are incorporated via logarithmic terms parameterized by coefficients, and we show that deviations from the Bekenstein-Hawking area law become significant at small horizon radii. For the radiation sector, we compute the electromagnetic flux, effective disk temperature, and spectral luminosity of geometrically thin accretion disks surrounding both black hole and wormhole configurations. Our results demonstrate that increasing the modified parameter enlarges the event horizon and enhances the emission, while increasing the black bounce parameter suppresses the horizon and softens the spectral profile, providing observational signatures that may distinguish SV-MOG compact objects from their Schwarzschild and pure SV counterparts.