Effective Lagrangian for Nambu-Goldstone modes in nonequilibrium open systems
Masaru Hongo, Suro Kim, Toshifumi Noumi, Atsuhisa Ota
Abstract
We develop the effective field theory of diffusive Nambu-Goldstone (NG) modes associated with spontaneous internal symmetry breaking taking place in nonequilibrium open systems. The effective Lagrangian describing semiclassical dynamics of the NG modes is derived and matching conditions for low-energy coefficients are also investigated. Due to new terms peculiar to open systems, the associated NG modes show diffusive gapless behaviors in contrast to the propagating NG mode in closed systems. We demonstrate two typical situations relevant to the condensed matter physics and high-energy physics, where diffusive type-A or type-B NG modes appear.
Topics & Concepts
GoldstoneLagrangianNon-equilibrium thermodynamicsPhysicsClassical mechanicsStatistical physicsTheoretical physicsQuantum electrodynamicsMathematical physicsQuantum mechanicsGeologyGeodesyCold Atom Physics and Bose-Einstein CondensatesQuantum many-body systemsTheoretical and Computational Physics