
The shear-stress response function in massless λφ⁴ theory exhibits a branch-cut singularity along the entire positive imaginary frequency axis, even with classical Boltzmann statistics, indicating the presence of long-lived, non-hydrodynamic modes arising from the interaction's behavior at high energies.


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the-emergence-of-a-branch-cut-singularity-in-the-shear-stress-response-function-of-massless-λφ⁴-theory-with-boltzmann-statistics


The Emergence of a Branch-Cut Singularity in the Shear-Stress Response Function of Massless λφ⁴ Theory with Boltzmann Statistics
