The maple package NPTOOLS; a symbolic algebra package for tetrad formalisms in general relativity
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journal contribution
posted on 1998-12-02, 00:00 authored by S Cyganowski, John CarminatiIn 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.
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Journal
Computer physics communicationsVolume
115Issue
2-3Pagination
200 - 214Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0010-4655Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
1998, Elsevier B.V.Usage metrics
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