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arXiv 2004.14783math.APmath.PR
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具有对数势的随机Allen-Cahn方程

Stochastic Allen-Cahn Equation with Logarithmic Potential

Federico Bertacco

摘要:

在齐次Neumann边界条件下,证明了带乘性Wiener噪声和对数位势的随机Allen-Cahn方程解的存在唯一性。解的存在性是在变分意义下通过一个近似方程得到的,该方程涉及非线性的Yosida正则化。假设噪声消失在物理相关域的极值点,并满足适当的Lipschitz连续性,允许证明近似解的一致估计。然后进行极限的传递,并验证解对初始数据的连续依赖性。在一个附加的假设下,证明了解析强解的存在性。最后,估计的导数的对数势推导出,鉴于研究的最优控制问题的随机Allen-Cahn方程。

英文摘要:

We prove existence and uniqueness of a solution for the stochastic Allen-Cahn equation with logarithmic potential and multiplicative Wiener noise, under homogeneous Neumann boundary condition. The existence of a solution is obtained in the variational sense by means of an approximated equation involving a Yosida regularization of the nonlinearity. The noise is assumed to vanish at the extremal points of the physical relevant domain and to satisfy a suitable Lipschitz-continuity property, allowing to prove uniform estimates of the approximated solution. The passage to the limit is then carried out and continuous dependence on the initial datum of the solution is verified. Under an additional assumption, the existence of an analytically strong solution is proved. Finally, estimates for the derivatives of the logarithmic potential are derived, in view of the study of an optimal control problem associated to the stochastic Allen-Cahn equation.

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