The boundary-support conjecture for the local time of super-Brownian motion

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Let S(Xt)={x:X(t,x)>0}‾S(X_t)=\overline{\{x:X(t,x)>0\}} be the closed support of XtX_t, let ∂S(Xt)\partial S(X_t) denote its boundary, and let LtL_t be the local-time measure associated with the boundary of the zero set. Here λ0\lambda_0 is the constant appearing in the dimension estimate for the boundary of the zero set. Boundary-support conjecture. The measure LtL_t is supported on ∂S(Xt)\partial S(X_t) and, consequently,

dim⁡(∂S(Xt))=2−2λ0\dim(\partial S(X_t))=2-2\lambda_0

on {Xt≠0}\{X_t\neq 0\}, PX0XP_{X_0}^X-almost surely and N0\mathbb{N}_0-almost everywhere. This would identify the support of the local time with the boundary of the support of the super-Brownian motion and determine the boundary's Hausdorff dimension on the non-extinction event. The claim is presented as a conjecture because it is not established whether BZt∖∂S(Xt)BZ_t\setminus\partial S(X_t) is non-empty; in particular, the existence of isolated zeros remains unresolved.

References

Primary source

Thomas Hughes and Edwin Perkins, “On the boundary of the zero set of super-Brownian motion and its local time”, arXiv:1802.03681 (2018).

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