PHI is a FeynCalc add-on that facilitates calculations in Chiral Perturbation Theory (ChPT). It was originally developed by Frederik Orellana during his PhD at the University of Bern.
PHI is currently developed and maintained by F. Orellana, V. Shtabovenko and R. Mertig.
The current version of PHI is for testing purposes only. It is not yet fully compatible with the most recent versions of FeynCalc. Some things might work, some won't.
PHI is designed as an add-on for FeynCalc. To use it you need at least FeynCalc 9.3 (development version) and Mathematica 8.
Install the latest development version of FeynCalc according to the instructions in the wiki
Run the following instruction in a Kernel or Notebook session of Mathematica
Import["https://raw.githubusercontent.com/FeynCalc/PHI/master/install.m"]
InstallPHI[InstallPHIDevelopmentVersion -> True]If the above code fails with URLFetch::invhttp: SSL connect error (e.g. with Mathematica 9 on macOS), try
ImportString[URLFetch["https://raw.githubusercontent.com/FeynCalc/PHI/master/install.m"]]
InstallPHI[InstallPHIDevelopmentVersion -> True] FileNameJoin[{$UserBaseDirectory, "Applications", "FeynCalc", "AddOns"}]and put the source code there.
For usage information see here. Notice that not all code examples are going to work, most of them probably won't :(
If you use PHI in your work, please cite