“Kerrr” black hole: The lord of the string

Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Trieste, Italy; Dipartimento di Fisica dell' Università di Trieste, Trieste, Italy
Physics Letters B (Impact Factor: 4.57). 04/2010; DOI: 10.1016/j.physletb.2010.03.075
Source: arXiv

ABSTRACT Kerrr in the title is not a typo. The third “r” stands for regular, in the sense of pathology-free rotating black hole. We exhibit a long search-for, exact, Kerr-like, solution of the Einstein equations with novel features: (i) no curvature ring singularity; (ii) no “anti-gravity” universe with causality violating time-like closed world-lines; (iii) no “super-luminal” matter disk.The ring singularity is replaced by a classical, circular, rotating string with Planck tension representing the inner engine driving the rotation of all the surrounding matter.The resulting geometry is regular and smoothly interpolates among inner Minkowski space, borderline de Sitter and outer Kerr universe. The key ingredient to cure all unphysical features of the ordinary Kerr black hole is the choice of a “non-commutative geometry inspired” matter source as the input for the Einstein equations, in analogy with spherically symmetric black holes described in earlier works.

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