Cutoff conjecture for symmetric simple exclusion with open boundaries

Let $p=\frac{1}{2}$ and let $\alpha,\beta,\gamma,\delta\geq 0$ satisfy

$$\max(\alpha,\gamma)>0,\qquad \max(\beta,\delta)>0.$$

Symmetric cutoff conjecture. The lower bound in the symmetric pre-cutoff estimate is sharp, and cutoff occurs.

This conjecture concerns the mixing behavior of the symmetric simple exclusion process with two open boundaries, viewed heuristically as a symmetric exclusion process on a circle. The source gives no resolution of the conjecture.