Absence of Renormalization of the Specific Heat Coefficient of the Interacting Fermion Systems

Abstract

Contrary to the longtime and widely conceived belief, we proved that the specific heat coefficient $γ$ --also called Sommerfeld coefficient -- of the interacting Fermion system is not renormalized by the wave-function renormalization factor $Z$ as far as the system remains a Fermi liquid state.

4 pages, 2 figures, A minor correction of Eq.(5)