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Geokerr: Computing Photon Orbits in a Kerr Spacetime

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Geokerr: Computing Photon Orbits in a Kerr Spacetime

Postby owlice » Mon Nov 08, 2010 7:13 pm

Geokerr: Computing Photon Orbits in a Kerr Spacetime

Abstract: Relativistic radiative transfer problems require the calculation of photon trajectories in curved spacetime. Programmed in Fortran, Geokerr uses a novel technique for rapid and accurate calculation of null geodesics in the Kerr metric. The equations of motion from the Hamilton-Jacobi equation are reduced directly to Carlson's elliptic integrals, simplifying algebraic manipulations and allowing all coordinates to be computed semi-analytically for the first time.

Credit: Dexter, Jason; Agol, Eric

Site: http://faculty.washington.edu/agol/geokerr/index.html
http://adsabs.harvard.edu/abs/2009ApJ...696.1616D

Bibcode: 2010ascl.soft11015D

ID: ascl:1011.015
Last edited by Ada Coda on Sun Aug 27, 2017 4:13 pm, edited 1 time in total.
Reason: Updated code entry.
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owlice
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Re: Geokerr: Computing Photon Orbits in a Kerr Spacetime

Postby owlice » Tue May 31, 2016 1:21 am

Edited abstract; previously, it was:
Relativistic radiative transfer problems require the calculation of photon trajectories in curved spacetime. We present a novel technique for rapid and accurate calculation of null geodesics in the Kerr metric. The equations of motion from the Hamilton-Jacobi equation are reduced directly to Carlson's elliptic integrals, simplifying algebraic manipulations and allowing all coordinates to be computed semi-analytically for the first time. We discuss the method, its implementation in a freely available FORTRAN code, and its application to toy problems from the literature.
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Re: Geokerr: Computing Photon Orbits in a Kerr Spacetime

Postby owlice » Sun Aug 27, 2017 4:13 pm

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