Collective modes 8 Atomic physics 4 Approximation theory 2 Brownian motors 2 COLLECTIVE MODES 2 CRISTALES FOTONICOS 2 Collisionless collective modes 2 Colloidal particle 2 Colloids 2 Continuum mechanics 2 Continuum theory 2 Coupled oscillators 2 Coupled phase oscillators 2 Coupling delays 2 Crystal separation 2 Degrees of freedom (mechanics) 2 Density functional theory 2 Differential equations 2 Discrete lattices 2 Dynamical density functional theories 2 EXCITACIONES COLECTIVAS 2 Elastic coupling 2 Elastic moduli 2 Electric currents 2 Electron traps 2 Fermi liquids 2 Fermi temperature 2 Fermions 2 Ion crystals 2 Ions 2