Z_2-gradings of Clifford algebras and multivector structures

Details Z_2-gradings of Clifford algebras and multivector structures Z_2-gradings of Clifford algebras and multivector structures

2002-12-05

arxiv.org/abs/math-ph/0212020v2

J. Phys. A 36, 4395-4405 (2003)

Physics

Mathematical Physics

10 pages, LaTeX; v2 accepted for publication in J. Phys. A

Scientific paper

10.1088/0305-4470/36/15/312

Let Cl(V,g) be the real Clifford algebra associated to the real vector space V, endowed with a nondegenerate metric g. In this paper, we study the class of Z_2-gradings of Cl(V,g) which are somehow compatible with the multivector structure of the Grassmann algebra over V. A complete characterization for such Z_2-gradings is obtained by classifying all the even subalgebras coming from them. An expression relating such subalgebras to the usual even part of Cl(V,g) is also obtained. Finally, we employ this framework to define spinor spaces, and to parametrize all the possible signature changes on Cl(V,g) by Z_2-gradings of this algebra.

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