  Linear response theory relates hydrodynamic transport coefficients to
equilibrium retarded correlation functions of the stress-energy tensor and
global symmetry currents in terms of Kubo formulas. Some of these transport
coefficients are non-dissipative and affect the fluid dynamics at equilibrium.
We present an algebraic framework for deriving Kubo formulas for such thermal
transport coefficients by using the equilibrium partition function. We use the
framework to derive Kubo formulas for all such transport coefficients of
superfluids, as well as to rederive Kubo formulas for various normal fluid
systems.
