Published online by Cambridge University Press: 13 March 2017
We prove the existence of infinitely many solutions $u\in W_{0}^{1,2}(\unicode[STIX]{x1D6FA})$ for the Kirchhoff equation
$$\begin{eqnarray}\displaystyle -\biggl(\unicode[STIX]{x1D6FC}+\unicode[STIX]{x1D6FD}\int _{\unicode[STIX]{x1D6FA}}|\unicode[STIX]{x1D6FB}u|^{2}\,dx\biggr)\unicode[STIX]{x1D6E5}u=a(x)|u|^{q-1}u+\unicode[STIX]{x1D707}f(x,u)\quad \text{in }\unicode[STIX]{x1D6FA}, & & \displaystyle \nonumber\end{eqnarray}$$
$\unicode[STIX]{x1D6FA}\subset \mathbb{R}^{N}$ is a bounded smooth domain,
$a(x)$ is a (possibly) sign-changing potential,
$0<q<1$,
$\unicode[STIX]{x1D6FC}>0$,
$\unicode[STIX]{x1D6FD}\geq 0$,
$\unicode[STIX]{x1D707}>0$ and the function
$f$ has arbitrary growth at infinity. In the proof, we apply variational methods together with a truncation argument.
The first author was partially supported by the National Council for Scientific and Technological Development (CNPq), Brazil.