Háskóli ÍslandsUniversity of IcelandFernández, DanielRajagopal, ArunaThorlacius, Larus2020-02-122020-02-122019-12-01Fernández, D., Rajagopal, A. & Thorlacius, L. Non-equilibrium steady states in quantum critical systems with Lifshitz scaling. J. High Energ. Phys. 2019, 115 (2019). https://doi.org/10.1007/JHEP12(2019)1151029-8479https://hdl.handle.net/20.500.11815/1528Publisher's version (útgefin grein).We study out-of-equilibrium energy transport in a quantum critical fluid with Lifshitz scaling symmetry following a local quench between two semi-infinite fluid reservoirs. The late time energy flow is universal and is accommodated via a steady state occupying an expanding central region between outgoing shock and rarefaction waves. We consider the admissibility and entropy conditions for the formation of such a non-equilibrium steady state for a general dynamical critical exponent z in arbitrary dimensions and solve the associated Riemann problem. The Lifshitz fluid with z = 2 can be obtained from a Galilean boost invariant field theory and the non-equilibrium steady state is identified as a boosted thermal state. A Lifshitz fluid with generic z is scale invariant but without boost symmetry and in this case the non-equilibrium steady state is genuinely non-thermal.115eninfo:eu-repo/semantics/openAccessNuclear and High Energy PhysicsEffective Field TheoriesSpace-Time SymmetriesQuantum Dissipative SystemsKjarneðlisfræðiSkammtafræðiinfo:eu-repo/semantics/articleJournal of High Energy Physics10.1007/JHEP12(2019)115