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The maple package NPTOOLS; a symbolic algebra package for tetrad formalisms in general relativity

journal contribution
posted on 1998-12-02, 00:00 authored by S Cyganowski, John Carminati
In this paper, we present and discuss the NPTOOLS package written for the computer algebra system Maple. The package contains the main routines "nulltran", "inv", "nullor", "ornull" and "pptype". The routine "nulltran" is an implementation of the 6-parameter Lorentz group in the Newman-Penrose (null tetrad) formalism, and "inv" checks for invariance of equations under subgroups of the Lorentz group. The routines "nullor" and "ornull" provide a translation between the Newman-Penrose quantities associated with the null tetrad and the orthonormal tetrad quantities associated with the Ellis-MacCallum formalism. Finally, "pptype" determines the Petrov-Plebański type of the Ricci tensor. © 1998 Elsevier Science B.V.

History

Journal

Computer physics communications

Volume

115

Issue

2-3

Pagination

200 - 214

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

0010-4655

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

1998, Elsevier B.V.

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