## Advances in Differential Equations

- Adv. Differential Equations
- Volume 17, Number 7/8 (2012), 605-634.

### Liouville-type theorems and bounds of solutions for Hardy-Hénon elliptic systems

#### Abstract

We consider the Hardy-Hénon system $-\Delta u =|x|^a v^p$, $-\Delta v =|x|^b u^q$ with $p,q>0$ and $a,b\in {\mathbb R}$ and we are concerned in particular with the Liouville property, i.e., the nonexistence of positive solutions in the whole space ${\mathbb R}^N$. In view of known results, it is a natural conjecture that this property should be true if and only if $(N+a)/(p+1)+(N+b)/(q+1)>(N-2)$. In this paper, we prove the conjecture for dimension $N=3$ in the case of bounded solutions and in dimensions $N\le 4$ when $a,b\le 0$, among other partial nonexistence results. As far as we know, this is the first optimal Liouville-type result for the Hardy-H\'enon system. Next, as applications, we give results on singularity and decay estimates as well as a priori bounds of positive solutions.

#### Article information

**Source**

Adv. Differential Equations, Volume 17, Number 7/8 (2012), 605-634.

**Dates**

First available in Project Euclid: 17 December 2012

**Permanent link to this document**

https://projecteuclid.org/euclid.ade/1355702970

**Mathematical Reviews number (MathSciNet)**

MR2963798

**Zentralblatt MATH identifier**

1262.35108

**Subjects**

Primary: 35J60: Nonlinear elliptic equations 35B53: Liouville theorems, Phragmén-Lindelöf theorems 35B33: Critical exponents 35B45: A priori estimates 35B40: Asymptotic behavior of solutions

#### Citation

Phan, Quoc Hung. Liouville-type theorems and bounds of solutions for Hardy-Hénon elliptic systems. Adv. Differential Equations 17 (2012), no. 7/8, 605--634. https://projecteuclid.org/euclid.ade/1355702970