131 research outputs found
Time-dependent attractors for non-autonomous nonlocal reaction-diffusion equations
In this paper, the existence and uniqueness of weak and strong solutions for a
non-autonomous nonlocal reaction-diffusion equation is proved. Next, the existence of minimal pullback attractors in the L2 -norm in the frameworks of universes of fixed bounded sets and those given by a tempered growth condition, and some relationships between them are established. Finally, we prove the existence of minimal pullback attractors in the H1-norm and study relationships among these new families and those given previously in the L2
- context. The results are also new in the autonomous framework in order to ensure the existence of global compact attractors, as a particular case.Ministerio de EconomÃa y CompetitividadFondo Europeo de Desarrollo RegionalJunta de AndalucÃ
Sufficient and Necessary Criteria for Existence of Pullback Attractors for Non-compact Random Dynamical Systems
We study pullback attractors of non-autonomous non-compact dynamical systems
generated by differential equations with non-autonomous deterministic as well
as stochastic forcing terms. We first introduce the concepts of pullback
attractors and asymptotic compactness for such systems. We then prove a
sufficient and necessary condition for existence of pullback attractors. We
also introduce the concept of complete orbits for this sort of systems and use
these special solutions to characterize the structures of pullback attractors.
For random systems containing periodic deterministic forcing terms, we show the
pullback attractors are also periodic. As an application of the abstract
theory, we prove the existence of a unique pullback attractor for
Reaction-Diffusion equations on with both deterministic and random
external terms. Since Sobolev embeddings are not compact on unbounded domains,
the uniform estimates on the tails of solutions are employed to establish the
asymptotic compactness of solutions.Comment: References adde
Robustness of time-dependent attractors in H1-norm for nonlocal problems
In this paper, the existence of regular pullback attractors as well as their upper semicontinuous behaviour in H1-norm are analysed for a parameterized family of non-autonomous nonlocal reaction-diffusion equations without uniqueness, improving previous results [Nonlinear Dyn. 84 (2016), 35–50].Ministerio de EconomÃa y CompetitividadFondo Europeo de Desarrollo RegionalJunta de AndalucÃ
Pullback attractors for reaction-diffusion equations in some unbounded domains with an H-1 -valued non-autonomous forcing term and without uniqueness of solutions
The existence of a pullback attractor for a reaction-diffusion equations in an unbounded domain containing a non-autonomous forcing term taking values in the space H−1, and with a continuous nonlinearity which does not ensure uniqueness of solutions, is proved in this paper. The theory of
set-valued non-autonomous dynamical systems is applied to the problem
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