Abstract By the hydrodynamic linear response theory, dynamical correlation functions decay as power laws along certain velocities, determined by flux Jacobian. Such correlations are obtained projections, and physically, they due to propagating ‘sound waves’ or generalisation thereof, transporting conserved quantities between observables. However, some observables do not emit sound waves, such o...

Hydrodynamic transport coefficients may be evaluated from first principles in a weakly coupled scalar field theory at arbitrary temperature. In a theory with cubic and quartic interactions, the infinite class of diagrams which contribute to the leading weak coupling behavior are identified and summed. The resulting expression may be reduced to a single linear integral equation, which is shown t...

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