DotExpand does not support lightcone components of Dirac matrices

[CalunVier]

• Your Mathematica version

14.1.0 for Microsoft Windows (64-bit) (December 13, 2023)

• Your FeynCalc version

10.1.0

• Did you try to reinstall FeynCalc (stable version) using the automatic installer to make sure that you have the latest bugfixes?

Yes

• Does your Mathematica initialization file contain statements that might influence the behavior of FeynCalc? Sometimes external packages may modify `init.m` in unusual ways, causing troubles for other codes.

(** User Mathematica initialization file **)

• Please provide a minimal working example that illustrates the problem and works on a fresh kernel. The example should be provided either by writing the code (as `InputForm`!) directly in the issue text or by attaching a Mathematica notebook. Please do not post code samples as screenshots, PDF files etc.: Those essentially require us to retype everything by hand, which is annoying and also time consuming. Please explain the difference between the current behavior and the expected behavior.

GALRD[\[Mu], n, nb] . (1 + GA[5]) // DotExpand // StandardForm

output

GALRD[\[Mu], n, nb] + GA[5] GALRD[\[Mu], n, nb]

It should be

GALRD[\[Mu], n, nb] + GA[5].GALRD[\[Mu], n, nb]

GA[5] and GALRD[[Mu], n, nb] should have “.” in the middle instead of a space.

[vsht]

Should be now fixed in the dev version.