# American Institute of Mathematical Sciences

March  2015, 35(3): 891-907. doi: 10.3934/dcds.2015.35.891

## Blow up of solutions of semilinear heat equations in non radial domains of $\mathbb{R}^2$

 1 Dipartimento di Matematica, Università di Roma Tor Vergata, Via della Ricerca Scientica 1, 00133 Roma, Italy 2 Dipartimento di Matematica e Fisica, Seconda Università di Napoli, V.le Lincoln 5, 81100 Caserta, Italy

Received  February 2014 Revised  May 2014 Published  October 2014

We consider the semilinear heat equation $$\label{problemAbstract}\left\{\begin{array}{ll}v_t-\Delta v= |v|^{p-1}v & \mbox{ in }\Omega\times (0,T)\\ v=0 & \mbox{ on }\partial \Omega\times (0,T)\\ v(0)=v_0 & \mbox{ in }\Omega \end{array}\right.\tag{\mathcal P_p}$$ where $p>1$, $\Omega$ is a smooth bounded domain of $\mathbb{R}^2$, $T\in (0,+\infty]$ and $v_0$ belongs to a suitable space. We give general conditions for a family $u_p$ of sign-changing stationary solutions of ($\mathcal P_p$), under which the solution of ($\mathcal P_p$) with initial value $v_0=\lambda u_p$ blows up in finite time if $|\lambda-1|>0$ is sufficiently small and $p$ is sufficiently large. Since for $\lambda=1$ the solution is global, this shows that, in general, the set of the initial conditions for which the solution is global is not star-shaped with respect to the origin. In [5] this phenomenon has been previously observed in the case when the domain is a ball and the sign changing stationary solution is radially symmetric. Our conditions are more general and we provide examples of stationary solutions $u_p$ which are not radial and exhibit the same behavior.
Citation: Francesca De Marchis, Isabella Ianni. Blow up of solutions of semilinear heat equations in non radial domains of $\mathbb{R}^2$. Discrete & Continuous Dynamical Systems - A, 2015, 35 (3) : 891-907. doi: 10.3934/dcds.2015.35.891
##### References:
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##### References:
 [1] Adimurthi and M. Grossi, Asymptotic estimates for a two dimensional problem with polynomial nonlinearity,, Proc. Amer. Math. Soc., 132 (2004), 1013. doi: 10.1090/S0002-9939-03-07301-5. Google Scholar [2] T. Cazenave, F. Dickstein and F. B. Weissler, Sign-changing stationary solutions and blow up for the nonlinear heat equation in a ball,, Math Ann., 344 (2009), 431. doi: 10.1007/s00208-008-0312-6. Google Scholar [3] F. De Marchis, I. Ianni and F. Pacella, Sign changing solutions of Lane Emden problems with interior nodal line and semilinear heat equations,, Journal of Differential Equations, 254 (2013), 3596. doi: 10.1016/j.jde.2013.01.037. Google Scholar [4] F. De Marchis, I. Ianni and F. Pacella, Asymptotic analysis and sign changing bubble towers for Lane-Emden problems,, accepted for publication in Journal of the European Mathematical Society, (). Google Scholar [5] F. Dickstein, F. Pacella and B. Sciunzi, Sign-changing stationary solutions and blow up for the nonlinear heat equation in dimension two,, Journal of Evolution Equation, 14 (2014), 617. doi: 10.1007/s00028-014-0230-x. Google Scholar [6] P. Esposito, M. Musso and A. Pistoia, On the existence and profile of nodal solutions for a two-dimensional elliptic problem with large exponent in nonlinearity,, Proc. Lond. Math. Soc., 94 (2007), 497. doi: 10.1112/plms/pdl020. Google Scholar [7] M. Grossi, C. Grumiau and F. Pacella, Lane Emden problems: Asymptotic behavior of low energy nodal solutions,, Ann. Inst. H. Poincare Anal. Non Lineaire, 30 (2013), 121. doi: 10.1016/j.anihpc.2012.06.005. Google Scholar [8] M. Grossi, C. Grumiau and F. Pacella, Lane Emden problems with large exponents and singular Liouville equations,, Journal Math. Pure and Appl., 101 (2014), 735. doi: 10.1016/j.matpur.2013.06.011. Google Scholar [9] V. Marino, F. Pacella and B. Sciunzi, Blow-up of solutions of semilinear heat equations in general domains,, Comm. Cont. Math., 14 (2014), 617. doi: 10.1142/S0219199713500429. Google Scholar [10] P. Quittner and P. Souplet, Superlinear Parabolic Problems,, Birkhäuser Basel-Boston-Berlin, (2007). Google Scholar [11] X. Ren and J. Wei, Single-point condensation and least-energy solutions,, Proc. Amer. Math. Soc., 124 (1996), 111. doi: 10.1090/S0002-9939-96-03156-5. Google Scholar
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