Reversal of force and energy coupling around a rotating black hole

Details Reversal of force and energy coupling around a rotating black hole Reversal of force and energy coupling around a rotating black hole

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.261..625c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 261, no. 3, p. 625-629.

Astronomy and Astrophysics

Astronomy

5

Black Holes (Astronomy), Gravitation Theory, Relativity, Rotating Plasmas, Angular Momentum, Kepler Laws

Scientific paper

The net force acting on a test particle orbiting around a rotating black hole reverses its sign several times, as opposed to just once around a rotating Newtonian star. Recently, this behavior has been explained in terms of reversal of the centrifugal force near a black hole or in terms of increase of the gravitational attraction below the photon orbit. We show that the phenomenon could be understood from the general relativistic coupling of various 'Newtonian' energy terms. In this case, one need not alter the concept of the centrifugal or the gravitational force from that provided by Newtonian physics. The new effects due to the non-linearity could be qualitatively reproduced in Newtonian geometry by, for example, introducing a quadrupole moment to the Newtonian star.

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