LorentzIndexNames is an option for
FCFAConvert, FCCanonicalizeDummyIndices and
other functions. It renames the generic dummy Lorentz indices to the
indices in the supplied list.
Overview, FCFAConvert, FCCanonicalizeDummyIndices, CartesianIndexNames.
LC[i1, i2, i3, i4] GA[i1, i2, i3, i4]
FCCanonicalizeDummyIndices[%]\bar{\gamma }^{\text{i1}}.\bar{\gamma }^{\text{i2}}.\bar{\gamma }^{\text{i3}}.\bar{\gamma }^{\text{i4}} \bar{\epsilon }^{\text{i1}\;\text{i2}\;\text{i3}\;\text{i4}}
\bar{\gamma }^{\text{FCGV}(\text{li191})}.\bar{\gamma }^{\text{FCGV}(\text{li192})}.\bar{\gamma }^{\text{FCGV}(\text{li193})}.\bar{\gamma }^{\text{FCGV}(\text{li194})} \bar{\epsilon }^{\text{FCGV}(\text{li191})\text{FCGV}(\text{li192})\text{FCGV}(\text{li193})\text{FCGV}(\text{li194})}
LC[i1, i2, i3, i4] GA[i1, i2, i3, i4]
FCCanonicalizeDummyIndices[%, LorentzIndexNames -> {mu, nu, rho, si}]\bar{\gamma }^{\text{i1}}.\bar{\gamma }^{\text{i2}}.\bar{\gamma }^{\text{i3}}.\bar{\gamma }^{\text{i4}} \bar{\epsilon }^{\text{i1}\;\text{i2}\;\text{i3}\;\text{i4}}
\bar{\gamma }^{\text{mu}}.\bar{\gamma }^{\text{nu}}.\bar{\gamma }^{\text{rho}}.\bar{\gamma }^{\text{si}} \bar{\epsilon }^{\text{mu}\;\text{nu}\;\text{rho}\;\text{si}}