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Ivancevic_Applied-Diff-Geom

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<strong>Applied</strong> Bundle <strong>Geom</strong>etry 6774.13.2.2 4D CaseNow we look at the spinors in four dimensional vector space.Consider an oriented orthonormal basis {e 1 , e 2 , e 3 , e 4 } of the Euclideanvector space R 4 . Then the standard oriented polarization P of C 4 ∼ = R 4 ⊗Cis generated by{ w 1 = e 1 − i e 2√2, w 2 = e 3 − i e 4√2}, and we haveS + = span C 〈 1 ΛP, w 1 ∧ w 2 〉, S − = span C 〈 w 1 , w 2 〉.Together, we have the following standard basis of S = S + ⊕ S − :{ 1 ΛP, w 1 ∧ w 2 , w 1 , w 2 }.Under this basis, any spinor s ∈ S may be written as a column vectorwith componentss =⎛ ⎞s 1⎜s 2⎟⎝s 3⎠s 4and we have a splitings = s + ⊕ s − =⎛⎝s + 1⎞ ⎛⎠ ⊕ ⎝s − 1s + 2 s − 2⎞⎠ =⎛⎝⎞s 1⎠ ⊕s 2⎛⎝⎞s 3⎠ .s 4Since S ∼ = C 4 , we have a representation: C(V ) ⊗ C ↩→ End(C 4 ). Tofind out the exact correspondencs, let’s consider the Clifford action of w i

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