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Large deviation principle for a stochastic nonlinear damp...
Sandip Roy, Debopriya Mukherjee, Manil Thankamani Mohan · 2025-10-08 · via math.PR updates on arXiv.org

The present paper focuses on the stochastic nonlinear Schrodinger equation with polynomial nonlinearity, and a zero-order (no derivatives involved) linear damping. Here, the random forcing term appears as a mix of a nonlinear noise in the Ito sense and a linear multiplicative noise in the Stratonovich sense. We prove the Laplace principle for the family of solutions to the stochastic system in a suitable Polish space, using the weak convergence framework of Budhiraja and Dupuis. This analysis is nontrivial, since it requires uniform estimates for the solutions of the associated controlled stochastic equation in the underlying solution space in order to verify the weak convergence criterion. The Wentzell Freidlin type large deviation principle is proved using Varadhan's lemma and Bryc's converse to Varadhan's lemma. The local well-posedness of the skeleton equation (deterministic controlled system) is established by employing the Banach fixed point theorem, and the global well posedness is established via Yosida approximation. We show that the conservation law holds in the absence of the linear damping and Ito noise. The well posedness of the stochastic controlled equation is also nontrivial in this case. We use a truncation method, a stopping time argument, and the Yosida technique to get the global well-posedness of the stochastic controlled equation.