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Unformatted text preview: Conventions and Useful Formulae I. Metric (Spacelike Convention) kl = kl 00 = 1 k = 0 , so that A B = A B = A B A B . This convention is the opposite of Peskin and Schroeder (PS): their metric is g = . Thus ( A B ) P S = A B . We always raise and lower indices with or . The natural forms x , will be identical to PS, but the unnatural forms x , will be the negative of the PS ones. For example, the quantum mechanical association of energy and momentum with time and space derivatives, for us, reads p = 1 i = i and the standard plane wave reads e ik x . Generally, our conventions look most like those of quantum mechanics! Units : h = c = 1 = e 2 4 . We, however shall take e > 0, the positron charge, so that the electron charge is e . II. Dirac Matrices , = 0 , 1 , 2 , 3. { , } = 2 where the braces denote the anticommutator. Sometimes we use and i = i . These conventions are identical to PS....
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 Spring '08
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