Speaker
Description
Hydrodynamics provides an effective macroscopic description for systems near thermal equilibrium. In hydrodynamic metals, due to the weak explicit breaking of translation invariance from impurity and/or phonon scattering, momentum relaxes slowly with a certain rate, which formally appears on the right-hand side of the momentum dynamical equation and causes a Drude-like peak in the thermoelectric conductivities. In this talk, I will discuss a systematic approach for constructing a hydrodynamic theory which incorporates momentum-relaxing gradient corrections beyond Drude i.e. arising at subleading order in the gradient expansion. The subleading terms arise at the same order as the shear and bulk viscosities. They effectively renormalize the weight of the Drude pole in the thermoelectric conductivities, and contribute to the dc conductivities at the same order as the incoherent conductivities. Our model is able to perfectly capture the transport properties of strongly-coupled holographic
metallic phases with broken translation invariance.
