Carleman Estimates and Controllability of Stochastic degenerate parabolic Heat Equations

This paper concerns the null controllability for a class of stochastic degenerate parabolic equations.

We first establish a global Carleman estimate for a linear forward stochastic degenerate equation with multiplicative noise.

Using this estimate we prove the null controllability of the backward equation and obtain a partial result for the controllability of the forward equation.

Also, using a new Carleman estimate for backward equation with weighted function which does not vanish at time t = 0 and the duality method HUM we get the null controllability of a forward stochastic degenerate equation under the action of two controls.