Entropy in Quantum Gravity: special issue

Almost thirty years after the introduction of the famous Bekenstein–Hawking formula [Bekenstein, J.D. Phys. Rev. 1973, D 7, 949. Hawking, S.W. Comm. Math. Phys. 1975, 43, 199.], relating the entropy of a black hole and its area, the thermodynamics of such objects still attracts research in this direction. One reason is due to the lack of a Quantum Gravity theory that should be able to explain black hole physics. Another reason comes from the fact that Hawking radiation develops modes of arbitrarily high frequency near the horizon. It is clear that the subject of studying Entropy in Quantum Gravity is far to be exhausted. This special section would focus on different contributions and approaches by some of the leading researchers in this field.