Comparison between Causal and Acausal Diffusion: a Schwinger-Keldysh Effective Field Theory Perspective

Navid Abbasi, Matthias Kaminski, Dirk H. Rischke

In Fick's time-honored theory of diffusion, the system responds instantaneously to external perturbations, resulting in acausal behavior. Maxwell-Cattaneo theory addresses this iss…