A black hole is the one of the fascinating objects of general relativity and has been variously studied from their theoretical aspects, mainly analyzing solutions and their properties with mathematical or physical tools, to astrophysical aspects such as jets, accretion disks, or gravitational waves, related to observational data. In the theoretical aspect of the black hole, one breakthrough was made by Bardeen, Cater, and Hawking in 1973 that black hole has thermodynamic “like” properties. In this talk I will focus on this feature of black holes and explain what kinds of studies have been done and its quantum gravity implication.
