A causal microscopic kinetic model can reproduce arbitrary rest-frame stable dissipative dispersion relations at real k through suitable initialization, providing a counterexample to claims that micro-causality alone restricts the analytic form of such relations.
Gavassino, (2026), arXiv:2602.21254 [math-ph]
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How acausal equations emerge from causal dynamics
A causal microscopic kinetic model can reproduce arbitrary rest-frame stable dissipative dispersion relations at real k through suitable initialization, providing a counterexample to claims that micro-causality alone restricts the analytic form of such relations.