[Commits] [svn:einsteintoolkit] Paper_EinsteinToolkit_2010/ (Rev. 81)

[tanja.bode at physics.gatech.edu]

User: tbode
Date: 2011/04/28 02:13 PM

Modified:
 /
  ET.tex

Log:
 Analysis section: some rewriting.

File Changes:

Directory: /
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File [modified]: ET.tex
Delta lines: +20 -20
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--- ET.tex	2011-04-28 18:45:59 UTC (rev 80)
+++ ET.tex	2011-04-28 19:13:37 UTC (rev 81)
@@ -1233,28 +1233,30 @@
 
 
 \subsection{Analysis\pages{4 Tanja}}
-It is beneficial to evaluate common analysis quantities online 
-rather than offline, in time-consuming post-processing procedures. 
-Beyond extracting physics, these quantities are often used as measures 
-of how accurately the simulation is progressing. Below we detail the 
-quantities available within Einstein Toolkit modules and the 
-assumptions and equations used by each.  The analysis capabilities of 
-the Einstein Toolkit broadly fall into three categories: horizons, 
-masses and momenta, and gravitational waves.  Many modules bridge these
-these categories and some fall outside them.  The latter are described 
-in the last subsection, including constraint monitoring and tools for 
-commonly required derived spacetime quantities. The following discussion
-is meant as an overview of the most common tools rather than an
-exhaustive list of functionality. In most cases, the analysis modules 
+It is often beneficial and sometimes necessary to evaluate analysis quantities
+during the simulation rather than post-processing variable output. Beyond
+extracting physics, these quantities are often used as measures of how
+accurately the simulation is progressing. In the following, we describe the 
+common quantities available through Einstein Toolkit modules, and how different
+modules approach these quantities with differing assumptions and algorithms.
+The most common analysis quantities provided broadly fall into three
+categories: horizons, masses and momenta, and gravitational waves.  Several
+modules bridge these categories and some fall outside them.  The latter, are
+described in the last subsection, including constraint monitoring and commonly
+desired derived spacetime quantities. The following discussion is meant as an
+overview of the most common tools rather than an exhaustive list of the
+functionality provided by the Einstein Toolkit. In most cases, the analysis modules 
 work on the variables stored in the base modules discussed in 
 Sec.~\ref{sec:base_modules} (\codename{ADMBase}, \codename{TmunuBase}, 
 and \codename{HydroBase}) to create as portable a tool as possible.
 
 \subsubsection{Horizons} 
-For spacetimes which contain a \bh{,} the Einstein Toolkit provides
-one module (\codename{EHFinder}) for finding event horizons and
-two modules for finding \ahz{s} (\codename{AHFinder}
-and \codename{AHFinderDirect}).
+When spacetimes contain a \bh{,} localizing a \bh{'s} horizon are necessary
+for describing time-dependent quasi-local measures of the \bh{} such as 
+mass and spin.  The Einstein Toolkit provides two modules (\codename{AHFinder}
+and \codename{AHFinderDirect}) for locating the \ahz{s}, defined locally on a
+hypersurface.  The module \codename{EHFinder} is also available to search an
+evolved spacetime for the globally defined event horizons.
 
 % Event horizon
 The event horizon module \codename{EHFinder}~\cite{Diener:2003jc} 
@@ -1530,9 +1532,7 @@
 where $S_i=-\frac{1}{\alpha} \left( T_{i0} - \beta^j T_{ij} \right)$.  
 The difference between these modules lies in how they access the stress 
 energy tensor $T_{\mu\nu}$, as the module \codename{ADMConstraints}
-uses a \todo{deprecated?}
-\todo{ES: yes, deprecated}
-functionality which does not require storage
+uses a deprecated functionality which does not require storage
 for $T_{\mu\nu}$.
 
 Finally, \codename{ADMAnalysis} calculates a variety of derived spacetime