Nonlocal black-hole thermodynamics and massive remnants

To alleviate the black-hole (BH) information problem, we study a holographic-principle-inspired nonlocal model of Hawking radiation in which radiated particles created at different times all have the same temperature corresponding to the instantaneous BH mass. Consequently, the black hole loses mass not only by continuously radiating new particles, but also by continuously warming previously radiated particles. The conservation of energy implies that the radiation stops when the mass of the black hole reaches the half of the initial BH mass, leaving a massive BH remnant with a mass much above the Planck scale.