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arxiv: 0709.2663 · v1 · submitted 2007-09-17 · 🧮 math.PR

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Regularity of the density for the stochastic heat equation

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classification 🧮 math.PR
keywords equationheatdensitylinearmomentsmultiplicativenegativenoise
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We study the smoothness of the density of a semilinear heat equation with multiplicative spacetime white noise. Using Malliavin calculus, we reduce the problem to a question of negative moments of solutions of a linear heat equation with multiplicative white noise. Then we settle this question by proving that solutions to the linear equation have negative moments of all orders.

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  1. Invariant measures for the open KPZ equation: the Gaussian case

    math.PR 2026-04 unverdicted novelty 4.0

    Brownian motion with drift α is invariant for the open KPZ equation under Neumann boundary conditions ∂x h(t,0) = ∂x h(t,1) = α.