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项目作者： nubirel

项目描述 ：
bimEX - Bimetric 3+1 Exact Computations
高级语言： Mathematica
项目地址: git://github.com/nubirel/bimEX.git
创建时间： 2019-02-01T10:02:24Z
项目社区：https://github.com/nubirel/bimEX
开源协议：GNU General Public License v3.0
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bimEX

bimetric 3+1 Exact Computations

https://doi.org/10.1016/j.cpc.2019.106948

https://arxiv.org/abs/1904.10464

bimEX is a Mathematica package making use of xAct. It provides a ready-to-use working framework in which one can manipulate the abstract bimetric equations in the 3+1 formalism, and compute them for arbitrary metric ansätze.

Getting started

To use bimEX, download the file bimEX.m and load it into a Mathematica notebook as,

<<"<path>/bimEX.m"

This repository also includes

  • The source file bimEX.nb
  • The working example bimEX_Working_Example.nb
  • Two notebooks bimEX_Decomposition_Lists_Loader.nb and bimEX_Decomposition_xAct_Loader, which are complementary to the working example
  • Two packages Decomposition_Lists.m and Decomposition_xAct.m, generated by bimEX_Working_Example.nb.
  • The file LICENSE.md
  • The file contributing.md

The notebook bimEX_Decomposition_Lists_Loader.nb loads the file Decomposition_Lists.m, whereas the notebook bimEX_Decomposition_xAct_Loader loads the file Decomposition_xAct.m.

Prerequisites

To run bimEX, you need to install Mathematica 11.0 (or later) and the xAct bundle.

Documentation

The documentation is provided in the form of Usage messages in Mathematica. They are accessible by typing

?<name_of_function_or_option>

in the Mathematica notebook. We also refer to the associated paper for additional information.

Testing the package

To test the package, do the following:

  • Put the files bimEX.m and the notebooks bimEX_Working_Example.nb, bimEX_Decomposition_Lists_Loader.nb and bimEX_Decomposition_xAct_Loader in the same folder
  • Open bimEX_Working_Example.nb and evaluate the notebook. This generates the two .m files Decomposition_Lists.m and Decomposition_xAct.m
  • Open bimEX_Decomposition_Lists_Loader.nb and bimEX_Decomposition_xAct_Loader in separate Mathematica’s kernels, and evaluate them.

Contributing

Please see the file contributing.md.

Author

  • Francesco Torsello

License

GNU GPL-3.0

A copy of this license is included in the file LICENSE.md.

Acknowledgments

It is a pleasure to thank Mikica Kocic for all the support and help he gave me during the development of bimEX.