Single-particle spectrum of the degenerate electron gas

Extensive numerical results in the Random Phase Approximation are presented for the spectral weight function, the momentum distribution, and the density of states of the degenerate electron gas over a range of metallic densities. The single-particle spectrum contains not only the damped quasiparticle but also structure due to plasmon effects. At low momenta there is a second elementary excitation of appreciable weight. The density of states has a satellite band at energies more than the plasma energy below the Fermi level. The results confirm the main features of an earlier analysis using a simplified dielectric function.