A contour line of the continuum Gaussian free field

Details A contour line of the continuum Gaussian free field A contour line of the continuum Gaussian free field

2010-08-14

arxiv.org/abs/1008.2447v1

Mathematics

Probability

44 pages, 1 figure

Scientific paper

Consider an instance $h$ of the Gaussian free field on a simply connected planar domain with boundary conditions $-\lambda$ on one boundary arc and $\lambda$ on the complementary arc, where $\lambda$ is the special constant $\sqrt{\pi/8}$. We argue that even though $h$ is defined only as a random distribution, and not as a function, it has a well-defined zero contour line connecting the endpoints of these arcs, whose law is SLE(4). We construct this contour line in two ways: as the limit of the chordal zero contour lines of the projections of $h$ onto certain spaces of piecewise linear functions, and as the only path-valued function on the space of distributions with a natural Markov property.

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