Non-Fermi Liquid Effects in QCD at High Density

Abstract

We study non-Fermi liquid effects due to the exchange of unscreened magnetic gluons in high density QCD by using an effective field theory. A one-loop calculation gives the well known result that magnetic gluons lead to a logarithmic enhancement in the fermion self energy near the Fermi surface. The self energy is of the form $\Sigma (\omega )\sim \omega \gamma \log (\omega )$, where $\omega$ is the energy of the fermion, $\gamma =O(g^2)$, and $g$ is the coupling constant. Using an analysis of the Dyson-Schwinger equations we show that, in the weak coupling limit, this result is not modified by higher order corrections even in the regime where the logarithm is large, $\gamma \log (\omega )\sim 1$. We also show that this result is consistent with the renormalization group equation in the high density effective field theory.

Comments: 16 pages, 4 figures