Conformally Schwarzschild black holes in an accelerating universe

摘要

We investigate the physical properties of conformally Schwarzschild black holes (BHs) in a background of accelerating universe. We discuss the effect of the cosmic expansion on the principal quantities of the BH such as mass, temperature, entropy and horizon radius. In particular, we investigate the quasi-static thermodynamics of the BH by considering the fact that the cosmic expansion is very slow on local time scales. We show that, by imposing a condition on Ricci scalar, one can describe time-dependent, spherically symmetric solutions of Einstein gravity in an accelerating universe background in a unified way. A generalization of cosmological horizon, its temperature and other properties of conformally Schwarzschild BHs in a background of accelerating universe is addressed.