Hawking radiation via tunneling from the spacetime of a spinning cosmic string black holes

Abstract

In this paper, we study Hawking radiation of massless and massive charged particles via tunneling process across the event horizon from the Schwarzschild and Reissner–Nordström black holes pierced by an infinitely long spinning cosmic string and a global monopole. Applying the WKB approximation and using a generalized Painlevé line element for stationary axisymmetric spacetimes, also by taking into account that the ADM mass and charge of the black hole decreases due to the presence of topological defects, it is shown that the Hawking temperature remains unchanged for these black holes. Furthermore, the tunneling rate is related to the change of the Bekenstein–Hawking entropy in both cases. The results extend the work of Parikh and Wilczek and are consistent with an underlying unitary theory.