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Ivancevic_Applied-Diff-Geom

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<strong>Applied</strong> Bundle <strong>Geom</strong>etry 675τ( exp( t e 2 e 3 ) ) =τ( exp( t e 2 e 4 ) ) =τ( exp( t e 3 e 4 ) ) =⎛⎞1 0 0 0⎜0 cos 2t − sin 2t 0⎟⎝0 sin 2t cos 2t 0⎠0 0 0 1⎛⎞1 0 0 0⎜0 cos 2t 0 − sin 2t⎟⎝0 0 1 0 ⎠0 sin 2t 0 cos 2t⎛⎞1 0 0 0⎜0 1 0 0⎟⎝0 0 cos 2t − sin 2t⎠ .0 0 sin 2t cos 2t4.13.2 SpinorsIn this subsection, mainly following [Yang (1995)], we define spinors andthe spinor representation of the Clifford algebras.4.13.2.1 Basic PropertiesLet {e i } i=1,...,dim V be an oriented, orthonormal basis of V , that means thereis a preferred ordering of the basis elements modulo even permutations. Thechirality operator 23 isΓ = i p e 1 . . . e dim V∈ C(V ) ⊗ C, wherep =[ ]dim V + 12={dim V2if dim V is even,dim V +12if dim V is odd.The Chirality operator satisfies: Γ 2 = 1 C(V ), and it super–anticommutes with elements v ∈ V , i.e., Γ v + (−1) dim V v Γ = 0.For dim V odd, Γ is in the center of C(V ) ⊗ C.23 Also known as the volume element or the complex unit. Physicists also denote it asγ 5 for the four dimensional case.

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