We consider Quasi-Extremal Kerr and Quasi-Extremal Schwarzschild-de Sitter Black Holes. From the known analytical expressions obtained for their Quasi-Normal Modes frequencies, we suggest an area quan-tization prescription for those objects.

A combined model of the Kerr spinning particle and superparticle is considered. The structure of the Kerr geometry is presented in a complex form as being created by a complex source. A natural supergeneralization of this construction is obtained corresponding to a complex " supersource ". Peforming a supershift to the Kerr and Kerr-Sen solutions we obtain metrics of supergravity black holes wi...

We consider Quasi-Extreme Kerr and Quasi-Extreme Schwarzschild-de Sitter Black Holes. From the known analytical expressions obtained for their Quasi-Normal Modes frequencies, we suggest an area quan-tization prescription for those objects.

The magnetization reversal in square lattice cobalt antidot arrays with the applied field at 45° to the anti dot rows was investigated using Lorentz electron microscopy in the Fresnel mode. While the hysteresis loops from magneto-optical Kerr effect measurements only reflect the easy axis character of the reversal, several different reversal processes were identified in the Fresnel images depen...

We criticize and generalize some properties of Nöther charges presented in a paper by V. Iyer and R. M. Wald and their application to entropy of black holes. The first law of black holes thermodynamics is proven for any gauge-natural field theory. As an application charged Kerr-Newman solutions are considered. As a further example we consider a (1 + 2) black hole solution. 1

When the term " black hole " was originally coined in 1968, it was immediately conjectured that the only pure vacuum equilibrium states were those of the Kerr family. Efforts to confirm this made rapid progress during the " classical phase " from 1968 to 1975, and some gaps in the argument have been closed during more recent years. However the presently available demonstration is still subject ...

Adapting and extending the techniques developed in recent work with Vasy for the study of the Cauchy horizon of cosmological spacetimes, we obtain boundedness, regularity and decay of linear scalar waves on subextremal Reissner–Nordström and (slowly rotating) Kerr spacetimes, without any symmetry assumptions; in particular, we provide simple microlocal and scattering theoretic proofs of analogo...