At the critical point of a Glauber-Kawasaki reaction-diffusion process, the only slow observable is the total density, whose fluctuations converge to a cubic nonlinear SDE, while all other modes are Gaussian and fast.
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Critical dynamical fluctuations in reaction-diffusion processes
At the critical point of a Glauber-Kawasaki reaction-diffusion process, the only slow observable is the total density, whose fluctuations converge to a cubic nonlinear SDE, while all other modes are Gaussian and fast.