Effective field theory near and far from equilibrium


Glorioso, P. (2019). Effective field theory near and far from equilibrium. Perimeter Institute. https://pirsa.org/19120016


Glorioso, Paolo. Effective field theory near and far from equilibrium. Perimeter Institute, Dec. 06, 2019, https://pirsa.org/19120016


          @misc{ pirsa_19120016,
            doi = {},
            url = {https://pirsa.org/19120016},
            author = {Glorioso, Paolo},
            keywords = {Condensed Matter},
            language = {en},
            title = {Effective field theory near and far from equilibrium},
            publisher = {Perimeter Institute},
            year = {2019},
            month = {dec},
            note = {PIRSA:19120016 see, \url{https://pirsa.org}}


In this talk I will discuss effective field theories for two classes of non-equilibrium systems, one far and one near equilibrium. The backbone of the approach is the Schwinger-Keldysh formalism, which is the natural starting point for doing field theory in non-equilibrium situations. In the first part of the talk I will present an effective response for topological driven (Floquet) systems, which are inherently far from equilibrium. As an example, I will discuss a chiral Floquet drive coupled to a background $U(1)$ field, which gives rise to a theta term in the response action, and show that this is independent of smooth deformations of the underlying system. In the second part, I will discuss an ongoing project using effective field theories for hydrodynamics. I will show that chiral diffusion for interacting systems in 1+1 dimensions, which may be relevant to edge transport in quantum Hall systems, has an infrared instability. I will then discuss the fate of this instability.