FeynCalc manual (development version)

CSI

CSI[i] can be used as input for 3-dimensional \sigma ^i with 3-dimensional Cartesian index i and is transformed into PauliSigma[CartesianIndex[i]] by FeynCalcInternal.

See also

Overview, PauliSigma.

Examples

CSI[i]

\overline{\sigma }^i

CSI[i, j] - CSI[j, i]

\overline{\sigma }^i.\overline{\sigma }^j-\overline{\sigma }^j.\overline{\sigma }^i

StandardForm[FCI[CSI[i]]]

(*PauliSigma[CartesianIndex[i]]*)

CSI[i, j, k, l]

\overline{\sigma }^i.\overline{\sigma }^j.\overline{\sigma }^k.\overline{\sigma }^l

StandardForm[CSI[i, j, k, l]]

(*CSI[i] . CSI[j] . CSI[k] . CSI[l]*)