Temperature dependent multi-branch test. It works! Then explodes.
Temperature dependent multi-branch test. It works! Then explodes.

Quite numerically unstable. Probably I need to cull the results to
remove the non-interacting (i.e. alpha :-> 0) phonon branches.
The non-temperature dependent Feynman vw variational procedure just ends
up with a very large v and w, whereas it seems to screw up the
line-search for the Osaka free energy, particularly at low temperature.
(fair enough I guess?)

jarvist/PolaronMobility.jl