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Boundary blow-up solutions to semilinear elliptic equations with nonlinear gradient terms. (English) Zbl 1288.35253
Summary: In this article we study the blow-up rate of solutions near the boundary for the semilinear elliptic problem $\displaylines{ \Delta u\pm |\nabla u|^q=b(x)f(u), \quad x\in\Omega,\cr u(x)=\infty, \quad x\in\partial\Omega, }$ where $$\Omega$$ is a smooth bounded domain in $$\mathbb{R}^N$$, and $$b(x)$$ is a nonnegative weight function which may be bounded or singular on the boundary, and f is a regularly varying function at infinity. The results in this article emphasize the central role played by the nonlinear gradient term $$|\nabla u|^q$$ and the singular weight $$b(x)$$. Our main tools are the Karamata regular variation theory and the method of explosive upper and lower solutions.
##### MSC:
 35J61 Semilinear elliptic equations 35J25 Boundary value problems for second-order elliptic equations 35B50 Maximum principles in context of PDEs 35J65 Nonlinear boundary value problems for linear elliptic equations 35B44 Blow-up in context of PDEs
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