Mass anomalous dimension from Dirac eigenmode scaling in conformal and confining systems

Understand

The mode number of the Dirac operator scales with an exponent related to the mass anomalous dimension gamma_m.

• This relation holds both in IR-conformal systems, as well as in confining systems for large enough eigenvalues.
• We investigate the Nf=4, 8 and 12 flavor SU(3) systems at several couplings near the chiral limit, and show that in general the scaling exponent varies with the eigenvalue, describing the dependence of gamma_m on the energy (or, equivalently, on the running coupling).
• This energy dependence can be explored even with fixed lattice parameters (bare coupling and mass).