Effective Lagrangian for Nambu-Goldstone modes in nonequilibrium open systems
High Energy Physics - Theory
2021-03-31 v1 Quantum Gases
Statistical Mechanics
High Energy Physics - Phenomenology
Nuclear Theory
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 semi-classical 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.
Cite
@article{arxiv.1907.08609,
title = {Effective Lagrangian for Nambu-Goldstone modes in nonequilibrium open systems},
author = {Masaru Hongo and Suro Kim and Toshifumi Noumi and Atsuhisa Ota},
journal= {arXiv preprint arXiv:1907.08609},
year = {2021}
}
Comments
6 pages(+3 pages supplemental material), 1 figure