Connected components of Brownian path intersections

Let B_t and W_t be two independent planar Brownian motions, started at uniform points in the unit square and run for unit time. Let S be the intersection of their ranges, i.e., the set of points visited by both paths. Are all the connected components of  S single points (almost surely on the event that S  is nonempty) ?

It is known (see [1]) that the range of \{B_t\} is intersection-equivalent in the unit square to a dyadic fractal percolation limit set
where squares of side-length 2^{-k} are retained with probability 1/k. We can deduce that S is
intersection-equivalent in the unit square to a fractal percolation limit set Q, where squares of side-length 2^{-k} are retained with probability 1/k^2. It follows from [2] that Q almost surely contains connected components that are larger than points; however, intersection equivalence is not strong enough to conclude that S also has this property.

 

[1] Peres, Yuval. "Intersection-equivalence of Brownian paths and certain branching processes." Communications in mathematical physics 177, no. 2 (1996): 417-434.

[2] Chayes, Jennifer T., Lincoln Chayes, and Richard Durrett. "Connectivity properties of Mandelbrot's percolation process." Probability theory and related fields 77, no. 3 (1988): 307-324.

Send me questions about this open problem