Linear temperature dependence of transport coefficients in metals is often ascribed to non-Fermi-liquid physics. Here we demonstrate the $T$-linear behavior of nonlocal conductivity in a clean 2D electron fluid, where carrier collisions assist conduction and lead to hydrodynamic transport with conductance rather than resistance growing with temperature. The key aspect is the occurrence of multiple hydrodynamic modes representing odd-parity modulations of the Fermi surface evolving in space and time. A cascade of such modes results in a linear $T$ dependence that extends down to lowest temperatures, as well as a Kolmogorov-like fractional power $-5/3$ scaling of conductivity vs wave number. This behavior serves as a clear signature of tomographic hydrodynamics driven by such modes, and is expected to be a generic feature of 2D electron fluids with simple near-circular Fermi surfaces.

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• Graphene
• Quantum fluids & solids
• Two-dimensional electron system