The Remnant of an Evaporating Rotating Regular Black Hole from the Generalized Entropy in the Final Stage of Evaporation

Abstract

We express the generalized entropy (GE) of the Hawking radiation in the final stage of an evaporating rotating regular black hole (BH) by writing the mass of the BH as $m_{\rm ext}+α$, where $m_{\rm ext}$ represents the mass at the extremal limit and $α$ is a parameter. Generally, entropy is non-negative. Based on this fact, we assume that, in the GE considered in this study, the signs of the contributions from the area term and the correction term remain unchanged throughout the entire evaporation process of the BH. Therefore, we regard $α$ at which the correction term vanishes as its lower bound and determine it. As a result, we find that such a value of $α$ is finite. Denoting this value by $α_1$, this result indicates that the mass of the BH cannot become smaller than $m_{\rm ext}+α_1$, which can be interpreted as the emergence of a remnant at the final stage of BH evaporation. The BH considered in this study is a rotating regular BH. The regularization is motivated by the fact that the fine structure of the central region becomes relevant in the final stage of evaporation. A rotating BH is considered from the viewpoint of generality.