Topological sigma models & dissipative hydrodynamics
- Author(s): Haehl, FM
- Loganayagam, R
- Rangamani, M
- et al.
Published Web Locationhttps://doi.org/10.1007/JHEP04(2016)039
© 2016, The Author(s). Abstract: We outline a universal Schwinger-Keldysh effective theory which describes macroscopic thermal fluctuations of a relativistic field theory. The basic ingredients of our construction are three: a doubling of degrees of freedom, an emergent abelian symmetry associated with entropy, and a topological (BRST) supersymmetry imposing fluctuationdissipation theorem. We illustrate these ideas for a non-linear viscous fluid, and demonstrate that the resulting effective action obeys a generalized fluctuation-dissipation theorem, which guarantees a local form of the second law.