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arXiv math/0303080math.APmath.DS
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R^n中抛物型方程的可容许性

On admissibility for parabolic equations in R^n

Martino Prizzi

摘要:

考虑相空间$H^1$中的抛物型方程$$u_t-Δu=F(x,u),\quad (t,x)\in\R_+\times\R^n\tag{P}$$和相应的半流$π$.我们给出了非线性$F(x,u)$的条件,保证了$H^1$的所有有界集在Rybakowski意义下是$π$ -可容许的.如果$F(x,u)$是渐近线性的,在适当的非共振条件下,我们使用Conley指数理论证明了(P)的非平凡平衡点和连接这些平衡点的异宿轨线的存在性。本文所得结果推广了Rybakowski关于$\R^n$的{ \it有界}开子集上的抛物型方程的早期结果.

英文摘要:

We consider the parabolic equation $$u_t-Δu=F(x,u),\quad (t,x)\in\R_+\times\R^n\tag{P}$$ and the corresponding semiflow $π$ in the phase space $H^1$. We give conditions on the nonlinearity $F(x,u)$, ensuring that all bounded sets of $H^1$ are $π$-admissibile in the sense of Rybakowski. If $F(x,u)$ is asymptotically linear, under appropriate non-resonance conditions, we use Conley's index theory to prove the existence of nontrivial equilibria of (P) and of heteroclinic trajectories joining some of these equilibria. The results obtained in this paper extend earlier results of Rybakowski concerning parabolic equations on {\it bounded} open subsets of $\R^n$.

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