From 2d031812d302379fe809b35d4c834451b0dde2cb Mon Sep 17 00:00:00 2001
From: goodale <goodale@0cbbb82d-14ec-4423-a1fb-2ab18257ecaa>
Date: Thu, 25 Apr 2002 22:03:52 +0000
Subject: Initial import of new Einstein stuff.  This has the new thorns, but
 not all are fully functional yet.

When I have completed this stage I'll send an updated spec out with some
questions which have arisen during this process.

Please don't import anything new without checking with me first, as I want
to play games on the server copying cvs files around to preserve histories
on files which are only minimally touched.

Tom



git-svn-id: http://svn.einsteintoolkit.org/cactus/EinsteinBase/StaticConformal/trunk@2 0cbbb82d-14ec-4423-a1fb-2ab18257ecaa
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 doc/documentation.tex | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++
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+\documentclass{article}
+\begin{document}
+
+\title{StaticConformal}
+\author{Tom Goodale et al}
+\date{April 2002}
+\maketitle
+
+\abstract{Base thorn to provide the variables for the static conformal factor}
+
+\section{Purpose}
+
+This thorn provides the variables defining a static conformal factor
+which is used to transform the physical metric.  If this thorn is
+active and the {\bf ADMBase::metric\_type} parameter is set to
+`static conformal' then the {\bf ADMBase::g...} variables are the
+conformal values as opposed to the physical values.
+
+The transformation is
+
+$$ g_{ij}^{\mbox{physical}} = \psi^4 g_{ij}^{\mbox{conformal}} $$
+
+The extrinsic curvature is not transformed.
+
+Memory is provided for the conformal factor {\bf psi}, its first
+derivatives {\bf psix}, {\bf psiy}, {\bf psiz}, and its second
+derivatives {\bf psixx}, {\bf psixy}, {\bf psixz}, {\bf psiyy}, {\bf
+psiyz}, and {\bf psizz} depending on the setting of the {\bf
+conformal\_storage} parameter.
+
+Thorns need to check the value of the grid scalar 
+{\bf conformal\_state} to determine how many levels of these variables have
+actually been calculated.
+
+\begin{itemize}
+\item[0] 
+No conformal factor has been calculated -- thorns may
+assume the conformal factor is 1 at all points.  (I.e. the metric is physical.)
+\item[1] 
+The conformal factor has been calulated, but no derivatives.
+\item[2]
+The conformal factor and its first derivatives have been calculated.
+\item[3]
+The conformal factor and its first and second derivatives have been calculated.
+\end{itemize}
+
+\section{Comments}
+
+The {\bf StaticConformal} thorn itself does not calculate any conformal
+factor, but does initialise the {\bf conformal\_state} variable to 0. 
+
+% Automatically created from the ccl files by using gmake thorndoc
+\include{interface}
+\include{param}
+\include{schedule}
+
+\end{document}
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