Mathematics – Probability

Scientific paper

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2007-03-15

Mathematics

Probability

33 pages, 2 figures

Scientific paper

We consider oriented percolation on Z^d times Z_+ whose bond-occupation probability is pD(...), where p is the percolation parameter and D is a probability distribution on Z^d. Suppose that D(x) decays as |x|^{-d-\alpha} for some \alpha>0. We prove that the two-point function obeys an infrared bound which implies that various critical exponents take on their respective mean-field values above the upper-critical dimension 2\min{\alpha,2}. We also show that, for every k, the Fourier transform of the normalized two-point function at time n, with a proper spatial scaling, has a convergent subsequence to exp(-c|k|^{\min{\alpha,2}}) for some c>0.

**Chen Lung-Chi**

Physics – Mathematical Physics

Scientist

**Sakai Akira**

Mathematics – Probability

Scientist

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