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Existence of solutions for a model of self-gravitating particles with external potential

Andrzej Raczyński (2004)

Banach Center Publications

We study the existence of solutions to a nonlinear parabolic equation describing the temporal evolution of a cloud of self-gravitating particles with a given external potential. The initial data are in spaces of (generalized) pseudomeasures. We prove existence of local and global-in-time solutions, and also a kind of stability of global solutions.

Existence of solutions for a semilinear elliptic system

Mohamed Benrhouma (2013)

ESAIM: Control, Optimisation and Calculus of Variations

This paper deals with the existence of solutions to the following system: - Δ u + u = α α + β a ( x ) | v | β | u | α - 2 u in N - Δ v + v = β α + β a ( x ) | u | α | v | β - 2 v in N . −Δu+u=αα+βa(x)|v|β|u|α−2u inRN−Δv+v=βα+βa(x)|u|α|v|β−2v inRN. With the help of the Nehari manifold and the linking theorem, we prove the existence of at least two nontrivial solutions. One of them is positive. Our main tools are the concentration-compactness principle and the Ekeland’s variational principle.

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