xPand

xPand is a computer algebra code for doing cosmological perturbation theory on a set of homogenioues background. It is part of the xAct distribution that runs on Mathematica.

INSTALLATION NOTES FOR THE xPand PACKAGE

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General Information:

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Visit http://www2.iap.fr/users/pitrou/xpand.htm

In order to install xPand, you first need to install xAct.

Installation of xAct:

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Download the latest the xAct package on 'http://www.xact.es/download.html'. Install instructions are provided on this website.

Once xAct is installed correctly, it should be located in one of the places that Mathematica prepares for external applications:

Linux:

• system-wide installation (requires root priviledges):

  /usr/share/Mathematica/Applications/

   or
  

  /usr/local/Wolfram/Mathematica/9.0/AddOns/Applications/

• single-user installation:

  $HOME/.Mathematica/Applications/

Mac OS:

• system-wide installation (requires root priviledges):

  /Library/Mathematica/Applications/

   or
  

  /Applications/Mathematica 9.0.app/AddOns/Applications/

• single-user installation:

  /Users//Library/Mathematica/Applications/

MSWindows:

• system-wide installation:

  C:\Documents and settings\All Users\Application data\Mathematica\Applications\

   or
  

  C:\Program Files\Wolfram Research\Mathematica\9.0\AddOns\Applications\

• single-user installation:

  C:\Documents and settings<user>\Application Data\Mathematica\Applications\

Beware that in Windows these directories might be hidden!

Installation of xPand:

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The package can be downloaded as a single tarball xPand_0.4.0.tar.gz. When uncompressed (typing 'tar -xzvf xPand_0.4.0.tar.gz' under Linux), it gives -a folder 'xPand' -a file 'xPand.m' -this documentation file 'documentation_xpand.txt''

Note that in some cases, for instance if you uncompress the tarball by a double click, these 3 items are likely to be placed below a folder named xPand_0.4.0.

The folder xPand, and the file 'xPand.m' must be placed inside the xAct directory. For instance, in a single user installation with Mac OS, there should be a folder /Users//Library/Mathematica/Applications/xAct/xPand and a file /Users//Library/Mathematica/Applications/xAct/xPand.m

Documentation:

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To load the CMB documentation go to `Add-Ons and Packages' in the Documentation Center (versions 6.0 of Mathematica at least required), then in 'xAct Packages' and 'xPand'.

Then the package can be loaded using unix style

    <<xAct/xPand.m

or Mathematica style

    <<xAct`xPand`

If you encouter any problem, don't hesitate to contact me at

    [email protected]

This is the "install" file of xPand. Last update: 8 Feb 2013.