Thermal Equilibrium of Black Dirings

Hideo Iguchi, Takashi Mishima

We show some physical properties of the systems of regular black diring(i.e. the systems having two $S^1$-rotational black rings in five-dimensional asymtotically flat spacetimes). Especially the existence of isothermal systems of black diring are shown, in which both iso-thermality and iso-rotation between the inner black ring and the outer black ring are realized. We also give detailed analysis of properties of the thermodynamic black diring including discussion about thermodynamic stabilities of the system