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Cactus Code Thorn AHFinderDirect
Authors : Jonathan Thornburg <jthorn@aei.mpg.de>
Maintainer : Jonathan Thornburg <jthorn@aei.mpg.de>
CVS info : $Header$
--------------------------------------------------------------------------
Purpose of the thorn
====================
This thorn finds an apparent horizon given the 3D xyz-grid metric and
extrinsic curvature. It uses a direct method, writing the apparent
horizon equation as an elliptic PDE on angular-coordinate space. This
is fast, but does require an intitial guess for the apparent horizon
position.
Documentation
=============
The doc/ directory contains detailed documentation for this thorn.
Distribution
============
This thorn should eventually become part of the CactusEinstein arrangement.
Copyright
=========
This thorn is copyright (C) 2001 by Jonathan Thornburg <jthorn@aei.mpg.de>
This thorn is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This thorn is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this thorn (see the file COPYING in this directory);
if not, write to the Free Software Foundation, Inc., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA
Other Software Required
=======================
* This thorn requires the Einstein thorn. (More accurately, it requires
various grid functions which are computed by the Einstein thorn.)
* This thorn is written in C++, so you'll need a C++ compiler to compile
this thorn. It calls various C and Fortran numerical libraries; if
these aren't already installed on your system, then you'll need C
and Fortran compilers to compile them.
* Most of this thorn's relativity code is machine-generated using Maple
(version 7), but you don't need Maple unless you want to modify the
relativity code.
Portability
===========
This thorn is known to compile and run successfully on the following
systems:
* Red Hat GNU/Linux, gcc/g++ version 2.96 20000731 (Red Hat Linux 7.1 2.96-98)
* OpenBSD, gcc/g++ version 2.95.3 20010125 (prerelease)
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