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arXiv 1507.04880math.AP
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非强制情形下梯度临界增长椭圆问题的多重性

Multiplicity results in the non-coercive case for an elliptic problem with critical growth in the gradient

Colette De Coster, Louis Jeanjean

摘要:

本文考虑边值问题\begin{equation} - Δu = λc(x)u+ μ(x) |\nabla u|^2 + h(x), \qquad u \in H^1_0(Ω) \cap L^{\infty}(Ω), \leqno{(P_λ)} \end{equation},其中$Ω\subset \R^N, N \geq 3$是具有光滑边界的有界区域.假设对于某些$p > N$,$c\gneqq 0$、$c,h$属于$L^p(Ω)$。对于某些$μ_1 \in \R$,还包括$μ\in L^{\infty}(Ω)$和$μ\geq μ_1 >0$。已知当$λ\leq 0$时,问题$(P_λ)$至多有一个解。在本文中,我们研究,在各种假设下,结构的一组解决方案的$(P_λ)$假设$λ>0$。我们的研究揭示了这个问题的丰富结构。我们表明,特别是$λ=0$发生的影响,在所有的半空间$]0,+\infty[\times(H^1_0(Ω) \cap L^{\infty}(Ω))$的解决方案。我们的大多数结果是有效的,没有假设$h$有一个符号。如果我们要求$h$有一个符号,我们观察到,对于$h\gneqq 0$和$h\lneqq 0$,解的集合完全不同。我们还表明,当$h$有一个标志,没有这个标志的解决方案可能存在。还得到了符号解的一些唯一性结果。本文最后列出了一系列悬而未决的问题。

英文摘要:

We consider the boundary value problem \begin{equation} - Δu = λc(x)u+ μ(x) |\nabla u|^2 + h(x), \qquad u \in H^1_0(Ω) \cap L^{\infty}(Ω), \leqno{(P_λ)} \end{equation} where $Ω\subset \R^N, N \geq 3$ is a bounded domain with smooth boundary. It is assumed that $c\gneqq 0$, $c,h$ belong to $L^p(Ω)$ for some $p > N$. Also $μ\in L^{\infty}(Ω)$ and $μ\geq μ_1 >0$ for some $μ_1 \in \R$. It is known that when $λ\leq 0$, problem $(P_λ)$ has at most one solution. In this paper we study, under various assumptions, the structure of the set of solutions of $(P_λ)$ assuming that $λ>0$. Our study unveils the rich structure of this problem. We show, in particular, that what happen for $λ=0$ influences the set of solutions in all the half-space $]0,+\infty[\times(H^1_0(Ω) \cap L^{\infty}(Ω))$. Most of our results are valid without assuming that $h$ has a sign. If we require $h$ to have a sign, we observe that the set of solutions differs completely for $h\gneqq 0$ and $h\lneqq 0$. We also show when $h$ has a sign that solutions not having this sign may exists. Some uniqueness results of signed solutions are also derived. The paper ends with a list of open problems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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