J/A+A/561/A127 ynogkm: code for calculating time-like geodesics (Yang+, 2014)
ynogkm: A new public code for calculating time-like geodesics in the
Kerr-Newmann spacetime.
Yang X.-L., Wang J.-C.
<Astron. Astrophys. 561, A127 (2014)>
=2014A&A...561A.127Y 2014A&A...561A.127Y
ADC_Keywords: Models ; Accretion
Keywords: accretion, accretion disks - black hole physics -
relativistic processes - methods: numerical
Description:
Here we present the source file for a new public code named ynogkm,
aim on calculating the time-like geodesics in a Kerr-Newmann spacetime
fast. In the code the four Boyer-Lindquis coordinates and proper time
are expressed as functions of a parameter p semi-analytically, i.e.,
r(p), µ(p), φ(p), t(p), and σ(p), by using the Weiers-
trass' and Jacobi's elliptic functions and integrals. All of the
ellip- tic integrals are computed by Carlson's elliptic integral
method, which guarantees the fast speed of the code.The source Fortran
file ynogkm.f90 contains three modules: constants, rootfind,
ellfunction, and blcoordinates.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
ynogkm.f90 128 8763 Source Fortran programs
ynogkm.zip 512 180617 Tarball if ynogkm code with examples
readme.txt 80 128 The readme file for the code ynogkm.f90
--------------------------------------------------------------------------------
Acknowledgements:
Xiao-Lin Yang, yangxl(at)ynao.ac.cn
References:
Yang & Wang, YNOGK code, 2013ApJS..207....6Y 2013ApJS..207....6Y
(End) Patricia Vannier [CDS] 18-Nov-2013