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Gravity and Strings

Gravity and Strings

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Gamma matrices <strong>and</strong> spinors 633<br />

labeled by the index â = (â, 4) which we raise <strong>and</strong> lower with the SO(2, 4) metric ˆη<br />

â ˆb =<br />

diag(++−−−−). Itcan be proved that these matrices are an orthonormal basis in the<br />

space of real 4 × 4 antisymmetric matrices with the trace as scalar product (rasing <strong>and</strong><br />

lowering indices with C):<br />

nâ αβn ˆb βα = 2δâ ˆb ,<br />

(B.146)<br />

n â γδ nâ αβ =−2δ[γδ] [αβ].

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