Cactus Einstein Frequently Asked Questions

The latest version of this FAQ is always available on the Cactus Code
web pages, at <http://www.cactuscode.org/Community/Relativity/FAQ>

CVS version: $Id: FAQ,v 1.5 2003/01/26 17:56:23 allen Exp $
CVS date: $Date: 2003/01/26 17:56:23 $

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The Questions:

A. Background

   1.  Who can I send questions about the Cactus Einstein arrangement to?
   2.  Where did the thorns in the Cactus Einstein arrangement come from?
   3.  Are there any future plans for the Cactus Einstein arrangement?
   4.  What license are the thorns distributed under? 
   5.  Can I publish a research paper which uses the thorns in Cactus 
       Einstein? 
   6.  Who maintains the Cactus Einstein arrangement? 

B. ADMBase

   1. Why is shift_state an INTEGER and not a BOOLEAN?
   2. What physical units are used in CactusEinstein?

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A. Background

1.  Who can I send questions about the Cactus Einstein arrangement to?

    Should send questions to the cactuseinstein mailing list, 

    cactuseinstein@cactuscode.org

    which is read by many of the people using the arrangement, and also
    by the Cactus maintainers. Be sure to subscribe to this list first
    to make sure that you see the reply!

2.  Where did the thorns in the Cactus Einstein arrangement come from?

    Some of the code in these thorns actually dates back to the 
    "Black Hole Grand Challenge Project" in the USA, specifically from
    the NCSA group. Most of the code at the moment however comes from 
    the past and present members of the numerical relativity group at 
    the Albert Einstein Institute, and from the many visitors to the 
    group. With the new Einstein arrangement there are now growing 
    contributions from outside the AEI group. 

3.  Are there any future plans for the Cactus Einstein arrangement?

    It is hoped that these thorns will be freely used and extended by the 
    general community. 

4.  What license are the thorns distributed under? 

    All the Cactus Einstein thorns are distributed under the Gnu GPL license.

5.  Can I publish a research paper which uses the thorns in Cactus Einstein? 
 
    Yes. We would like it very much if you would mention both the Cactus 
    framework and the CactusEinstein arrangement in your acknowledgements
    and/or citations ... this helps us to obtain funds for supporting Cactus.

6.  Who maintains the Cactus Einstein arrangement? 

    The arrangement is collectively maintained by the Cactus Team, the
    members of the Albert Einstein Institute numerical relativity group, 
    the original authors, as well as other people who use the thorns.

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B. ADMBase

1. Why is shift_state an INTEGER and not a BOOLEAN?

   Simply because BOOLEAN grid variables are not supported in Cactus

2. What physical units are used in CactusEinstein?

   G=c=1. You are free to pick your own mass or length scale in the initial
   data.

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