Fig. 2
From: Divergent features of collective gravitational quantum excitations
(a) The real part of matter-wave dispersion of electrostatic (thin curves), gravitational (thick curves) and free particle (dashed curve) relativistic quasiparticle excitations. (b) The imaginary part of matter-wave dispersion of electrostatic (thin curves) and gravitational (thick curves) relativistic quasiparticle excitations. (c) Effective mass (thick curve), phase speed (dashed curve), and group speed (thin curve) of relativistic electrostatic quasiparticles (plasmons). (d) Effective mass (thick curve), phase speed (dashed curve), and group speed (thin curve) of relativistic gravitational quasiparticles (GQ).
