Chiral Kinetic Theory from Effective Field Theory Revisited

Understand

We revisit the chiral kinetic equation from high density effective theory approach, finding a chiral kinetic equation differs from counterpart derived from field theory in high order terms in the $O(1/\mu)$ expansion, but in agreement with the equation derived in on-shell effective field theory upon identification of cutoff.

• By using reparametrization transformation properties of the effective theory, we show that the difference in kinetic equations from two approaches are in fact expected.
• It is simply due to different choices of degree of freedom by effective theory and field theory.
• We also show that they give equivalent description of the dynamics of chiral fermions.