Abstract

BERMAN, Marcelo Samuel. Gravitomagnetism and angular momenta of black-holes. Rev. mex. astron. astrofis [online]. 2007, vol.43, n.2, pp.297-302. ISSN 0185-1101.

We review the energy contents formulae of Kerr-Newman black-holes, where gravitomagnetic energy term comes into play (Berman 2004, 2006a,b). Then, we obtain the angular momenta formulae, which include the gravitomagnetic effect. Three theorems can be enunciated: (1) No black-hole has its energy confined to its interior; (2) Rotating black-holes do not have confined angular momenta; (3) The energy density of a black-hole is not confined to its interior. The difference between our calculation and previous ones by Virbhadra (1990a,b,c), and Aguirregabiria et al. (1996), lies in the fact that we include a term responsible for the self-gravitational energy, while the cited authors discarded such effect, which appears in the static black hole energy calculation.

Keywords : Black hole physics; gravitation; magnetic fields.

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