Kerr geodesics, the Penrose process and jet collimation by a black hole

Details Kerr geodesics, the Penrose process and jet collimation by a black hole Kerr geodesics, the Penrose process and jet collimation by a black hole

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010a%26a...515a..15g&link_type=abstract

Astronomy and Astrophysics, Volume 515, id.A15

Physics

3

Black Hole Physics, Acceleration Of Particules, Relativistic Processes

Scientific paper

Aims: We re-examine the possibility that astrophysical jet collimation may arise from the geometry of rotating black holes and the presence of high-energy particles resulting from a Penrose process, without the help of magnetic fields. Methods: Our analysis uses the Weyl coordinates, which are revealed better adapted to the desired shape of the jets. We numerically integrate the 2D-geodesics equations. Results: We give a detailed study of these geodesics and give several numerical examples. Among them are a set of perfectly collimated geodesics with asymptotes ρ = ρ 1 parallel to the z-axis, with ρ 1 only depending on the ratios Q/E2-1 and a/M, where a and M are the parameters of the Kerr black hole, E the particle energy and Q the Carter's constant.

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