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Mathematics  2005 

Moderate deviations and laws of the iterated logarithm for the renormalized self-intersection local times of planar random walks

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Let B_n be the number of self-intersections of a symmetric random walk with finite second moments in the integer planar lattice. We obtain moderate deviation estimates for B_n - E B_n and E B_n- B_n, which are given in terms of the best constant of a certain Gagliardo-Nirenberg inequality. We also prove the corresponding laws of the iterated logarithm.


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