Quasiblack holes: general conception and physical applications

by Prof. Oleg Zaslavskii (Karazin National University, Ukraine)

Thursday 9 Jul 2015, 15:00 → 16:00 Europe/Rome

Aula Teorici (Dipartimento di Fisica e Astronomia)

Objects that are on the verge of being extremal black holes but actually are distinct in many ways are called quasi-black holes (QBH). General properties of their space-time geometry are reviewed. The main ones are (i) their geometry remains perfectly regular everywhere, in spite of the existence of infinite redshifts, (ii) in the limit, outer and inner regions become mutually impenetrable and disjoint, although, in contrast to the usual black BHs, this separation is of a dynamic nature, rather than purely causal. This general conception of QBH allows us to derive Smarr mass-formula for black holes and black hole entropy without a black hole. Also, we discuss self-consistent definition of the entropy in the extremal case. Physical recitation of QBHs including Majumdar-Papapetrou systems and their generalization to the scalar field are discussed.