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xPert: Computer algebra for metric perturbation theory

Authors: David Brizuela, José M. Martín-García and Guillermo A. Mena Marugán, © 2006-2020 under GPL.

Article: D. Brizuela, J. M. Martín-García and G. A. Mena Marugán, Gen. Rel. Grav. 41 (2009), 2415--2431, arXiv: 0807.0824.


This is a package for fast construction and manipulation of the equations of metric perturbation theory, of interest in General Relativity and other field theories. It is based on the use of explicit formulas for the construction of the n-th order perturbation of the most relevant curvature tensors.

See xPert.History

Download and installation

Current version: 1.0.6 (as of 28 February 2018). It is recommended to download the main xAct bundle, but you can also download the different files separately:

See the Installation notes.