Degeneracy

Analogous to the change in the effective mass (the ‘self energy’) of the electron due to electromagnetic fields in a solid.

In the chiral symmetry limit a1 and r are degenerate (model independent) -- but how?
- Single degenerate peak?
- Degenerate broad spectra function?

Analogous to the change in the effective mass (the ‘self energy’) of the electron due to electromagnetic fields in a solid.