\documentclass{article} \begin{document} \title{ADMCoupling} \author{Ian Hawke} \date{03/05/2002} \maketitle \abstract{ADMCoupling} \section{Purpose} \label{sec:aux} This thorn is completely trivial (there's already more words in the documentation than in the code). The point is to allow clean coupling of matter thorns and spacetime evolution thorns. By making a spacetime thorn (such as BSSN) a friend of ADMCoupling it can know about the variables of the matter thorns (such as Whisky) as long as they are also friends of ADMCoupling, and then the appropriate stress energy tensor terms can be included through the {\tt CalcTmunu} interface. This avoids explicit dependencies between the spacetime and matter evolution thorns. Note that we need to do the same for certain analysis thorns, such as ADMConstraints. \include{interface} \include{param} \include{schedule} \end{document}