FeynCalc manual (development version)

FCLoopToGLI

FCLoopToGLI[int, lmoms] converts the integral int depending on the loop momenta lmoms to the GLI-notation. The function returns a GLI-integral and a minimal FCTopology containing only the propagators from the original integral.

See also

Overview, FCLoopFromGLI, FCTopology, GLI, FCLoopValidTopologyQ.

Examples

FCLoopToGLI[FAD[{k, m}], {k}]

\left\{G^{\text{loopint\$19}}(1),\text{FCTopology}\left(\text{loopint\$19},\left\{\frac{1}{(k^2-m^2+i \eta )}\right\},\{k\},\{\},\{\},\{\}\right)\right\}

FCLoopToGLI[FAD[{k1, m1}, {k2, m2}, {k1 - k2}], {k1, k2}]

\left\{G^{\text{loopint\$20}}(1,1,1),\text{FCTopology}\left(\text{loopint\$20},\left\{\frac{1}{(\text{k2}^2-\text{m2}^2+i \eta )},\frac{1}{((\text{k1}-\text{k2})^2+i \eta )},\frac{1}{(\text{k1}^2-\text{m1}^2+i \eta )}\right\},\{\text{k1},\text{k2}\},\{\},\{\},\{\}\right)\right\}