I am trying to calculate the two and three-loop divergences in a certain quantum field theory. This is beyond the domain where I can do anything by hand, and I would appreciate any recommendations for software.
One difficulty is that the theory I am considering is non-Lorentz invariant -- Lorentz symmetry is broken by a background field. As far as I can tell it is hard to implement this in most packages.
Any help is much appreciated!
