Long-range quasi-static gauge-boson interactions lead to anomalous (non-Fermi-liquid) behavior of the specific heat in the low-temperature limit of an electron or quark gas with a leading $T\ln T^{ -1}$ term. We obtain perturbative results beyond the leading log approximation and find that dynamical screening gives rise to a low-temperature series involving also anomalous fractional powers $T^{ (3+2n)/3}$. We determine their coefficients in perturbation theory up to and including order $T^{ 7/3}$ and compare with exact numerical results obtained in the large-$N_f$ limit of QED and QCD.
Categories: hep-ph cond-mat.str-el