Abstract
Under general conditions we show an a priori probabilistic Harnack inequality for the non-negative solution of a stochastic partial differential equation of the following form
We also show that the solutions of the above equation are almost surely strictly positive if the initial condition is non-negative and not identically vanishing.
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Acknowledgements
The project was initially started by the author and Doctor Yu Wang (currently in Goldman Sachs) in 2014 upon the completion of [6]. Although the collaboration ended after the departure of Yu Wang, the discussion with him has helped clarify many confusions. His contribution to this project is greatly appreciated.
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Wang, Z. A probabilistic Harnack inequality and strict positivity of stochastic partial differential equations. Probab. Theory Relat. Fields 171, 653–684 (2018). https://doi.org/10.1007/s00440-017-0789-6
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DOI: https://doi.org/10.1007/s00440-017-0789-6