Abstract: Hydrodynamics provides a low-energy effective description for systems near thermal equilibrium. Conservation equations for the currents associated to various symmetries of the system, along with their constitutive relations expressed as an expansion in gradients, encapsulate the dynamics of the system. However, in real life systems, some of the assumed symmetries might get weakly broken. For instance, the presence of disorder can lead to a weak explicit breaking of translation invariance, and consequently momentum relaxation. In this talk, I will discuss a systematic approach for constructing a hydrodynamic theory which incorporates leading and subleading momentum relaxing effects. It turns out that the leading momentum relaxing effects are captured by a single dissipative transport parameter that leads to a Drude-like peak in the thermoelectric response of the system. Interestingly, the subleading effects are captured by three transport parameters which effectively renormalize the weights of the Drude peaks in the thermoelectric response, and can have observable consequences. The hydrodynamic model is also able to perfectly capture the results previously obtained using gauge/gravity duality for strongly coupled systems.

Meeting ID: 944 6883 7455
Passcode: 476664