# Non-equilibrium effective field theory and second sound

@article{Landry2020NonequilibriumEF, title={Non-equilibrium effective field theory and second sound}, author={Michael Landry}, journal={Journal of High Energy Physics}, year={2020}, volume={2021} }

We investigate the phenomenon of second sound in various states of matter from the perspective of non-equilibrium effective field theory (EFT). In particular, for each state of matter considered, we find that at least two (though sometimes multiple) qualitatively different EFTs exist at finite temperature such that there is always at least one EFT with a propagating second-sound wave and at least one with no such second-sound wave. To aid in the construction of these EFTs, we use the method of…

## 4 Citations

### Holographic Schwinger-Keldysh field theory of SU(2) diffusion

- PhysicsJournal of High Energy Physics
- 2022

We construct effective field theory for SU(2) isospin charge diffusion, based on holographic Schwinger-Keldysh contour [1]. The holographic model consists of a probe SU(2) gauge field in a doubled…

### Holographic Schwinger-Keldysh field theory of SU(2) diffusion

- PhysicsJournal of High Energy Physics
- 2022

We construct effective field theory for SU(2) isospin charge diffusion, based on holographic Schwinger-Keldysh contour [1]. The holographic model consists of a probe SU(2) gauge field in a doubled…

### Effective field theory of fluctuating wall in open systems: from a kink in Josephson junction to general domain wall

- PhysicsSciPost Physics
- 2022

We investigate macroscopic behaviors of fluctuating domain walls in nonequilibrium open systems with the help of the effective field theory based on symmetry.
Since the domain wall in open systems…

### A holographic superfluid symphony

- PhysicsJournal of High Energy Physics
- 2021

We study the hydrodynamic excitations of backreacted holographic superfluids by computing the full set of quasinormal modes (QNMs) at finite momentum and matching them to the existing hydrodynamic…

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