## Stochastic inertial manifold.(English)Zbl 0854.60059

Summary: A nonlinear stochastic evolution equation in Hilbert space with generalized additive white noise is considered. A concept of stochastic inertial manifold is introduced, defined as a random manifold depending on time, which is finite-dimensional, invariant for the dynamic, and attracts exponentially fast all the trajectories as $$t \to \infty$$. Under the classical spectral gap condition of the deterministic theory, the existence of a stochastic inertial manifold is proved. It is obtained as the solution of a stochastic partial differential equation of degenerate parabolic type, studied by a variant of Bernstein method. A result of existence and uniqueness of a stationary inertial manifold is also proved; the stationary inertial manifold contains the random attractor, introduced in previous works.

### MSC:

 60H15 Stochastic partial differential equations (aspects of stochastic analysis)
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