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Search: All articles in the CJM digital archive with keyword monotonicity

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1. CJM Online first

Du, Zhuoran; Fang, Yanqin; Gui, Changfeng
A class of degenerate elliptic equations with nonlinear boundary conditions
We consider positive solutions of the problem \begin{equation} (*)\qquad \left\{ \begin{array}{l}-\mbox{div}(x_{n}^{a}\nabla u)=bx_{n}^{a}u^{p}\;\;\;\;\;\mbox{in}\;\;\mathbb{R}_{+}^{n}, \\ \frac{\partial u}{\partial \nu^a}=u^{q} \;\;\;\;\;\;\;\; \;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\mbox{on}\;\;\partial \mathbb{R}_{+}^{n}, \\ \end{array} \right. \end{equation} where $a\in (-1,0)\cup(0,1)$, $b\geq 0$, $p, q\gt 1$ and $\frac{\partial u}{\partial \nu^a}:=-\lim_{x_{n}\rightarrow 0^+}x_{n}^{a}\frac{\partial u}{\partial x_{n}}$. In special case $b=0$, it is associated to fractional Laplacian equation $(-\Delta)^{s}u=u^{q} $ in entire space $\mathbb{R}^{n-1}$. We obtain the existence of positive axially symmetric solutions to ($*$) for the case $a\in (-1,0)$ in $n\geq3$ for supercritical exponents $p\geq\frac{n+a+2}{n+a-2}, \;\;q\geq\frac{n-a}{n+a-2}$. The nonexistence is obtained for the case $a\in (-1,0)$, $b\geq 0$ and any $p,~q\gt 1$ in $n=2$ as well.

Keywords:existence, non-existence, positive solutions, degenerate elliptic equation, nonlinear boundary conditions, symmetry, monotonicity
Categories:35D30, 35J70, 35J25

2. CJM 2014 (vol 67 pp. 350)

Colombo, Maria; De Pascale, Luigi; Di Marino, Simone
Multimarginal Optimal Transport Maps for One-dimensional Repulsive Costs
We study a multimarginal optimal transportation problem in one dimension. For a symmetric, repulsive cost function, we show that given a minimizing transport plan, its symmetrization is induced by a cyclical map, and that the symmetric optimal plan is unique. The class of costs that we consider includes, in particular, the Coulomb cost, whose optimal transport problem is strictly related to the strong interaction limit of Density Functional Theory. In this last setting, our result justifies some qualitative properties of the potentials observed in numerical experiments.

Keywords:Monge-Kantorovich problem,optimal transport problem, cyclical monotonicity
Categories:49Q20, 49K30

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