## Random attractors for stochastic porous media equations perturbed by space-time linear multiplicative noise.(English)Zbl 1385.37082

Summary: Unique existence of solutions to porous media equations driven by continuous linear multiplicative space-time rough signals is proven for initial data in $$L^{1}(\mathcal{O})$$ on bounded domains $$\mathcal{O}$$. The generation of a continuous, order-preserving random dynamical system on $$L^{1}(\mathcal{O})$$ and the existence of a random attractor for stochastic porous media equations perturbed by linear multiplicative noise in space and time is obtained. The random attractor is shown to be compact and attracting in $$L^{\infty}(\mathcal{O})$$ norm. Uniform $$L^{\infty}$$ bounds and uniform space-time continuity of the solutions is shown. General noise including fractional Brownian motion for all Hurst parameters is treated and a pathwise Wong-Zakai result for driving noise given by a continuous semimartingale is obtained. For fast diffusion equations driven by continuous linear multiplicative space-time rough signals, existence of solutions is proven for initial data in $$L^{m+1}(\mathcal{O})$$.

### MSC:

 37L55 Infinite-dimensional random dynamical systems; stochastic equations 35R60 PDEs with randomness, stochastic partial differential equations 60H10 Stochastic ordinary differential equations (aspects of stochastic analysis) 60H15 Stochastic partial differential equations (aspects of stochastic analysis) 76S05 Flows in porous media; filtration; seepage 37L30 Attractors and their dimensions, Lyapunov exponents for infinite-dimensional dissipative dynamical systems
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