A. Jüngel, D. Matthes:

"The Derrida-Lebowitz-Speer-Spohn equation: existence nonuniqueness, and decay rates of the solutions";

SIAM Journal on Mathematical Analysis,39(2008), 6; S. 1996 - 2015.

Siehe englisches Abstract.

A logarithmic fourth-order equation, called the Derrida-Lebowitz-Speer-Spohn equation, with periodic boundary conditions is analyzed. The global-in-time existence of weak nonnegative solutions in up to three space dimensions is shown. Furthermore, a family of entropy-entropy dissipation inequalities is derived in arbitrary space dimensions, and rates of the exponential decay of the weak solutions to the homogeneous steady state are estimated. The proofs are based on the algorithmic entropy construction method developed by the authors and on an exponential variable transformation. Finally, an example for nonuniqueness of

the solution is provided.

Entropy methods, fourth-order parabolic equation

Erstellt aus der Publikationsdatenbank der Technischen Universität Wien.