Giachetti, Daniela and Murat, François:
An Elliptic Problem with a Lower Order Term Having Singular Behaviour
Bollettino dell'Unione Matematica Italiana Serie 9 2 (2009), fasc. n.2, p. 349-370, (English)
pdf (308 Kb), djvu (172 Kb). | MR 2537275 | Zbl 1173.35469
Sunto
We prove the existence of distributional solutions to an elliptic problem with a lower order term which depends on the solution $u$ in a singular way and on its gradient $Du$ with quadratic growth. The prototype of the problem under consideration is $$\begin{cases} - \Delta u + \lambda u = \pm \frac{|Du|^{2}}{|u|^{k}} + f \quad & \text{in} \, \Omega, \\ u=0 & \text{on} \, \partial \Omega, \end{cases}$$ where $\lambda > 0$, $k > 0$; $f(x) \in L^{\infty}(\Omega)$, $f(x) \ge 0$ (and so $u \ge 0$). If $0 < k < 1$, we prove the existence of a solution for both the "+" and the "-" signs, while if $k \ge 1$, we prove the existence of a solution for the "+" sign only.
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