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arXiv 1712.04091math.APmath.DG
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关于heat equation的古解

On ancient solutions of the heat equation

Fanghua Lin, Qi S. Zhang

摘要:

在欧氏情形下,得到了热方程所有正古解的一个显式表示公式,在里奇曲率为非负的黎曼情形下,也得到了一个类似的但不太显式的表示公式,并证明了任何正古解都是椭圆算子族$Δ- s$的正解的标准拉普拉斯变换,其正解具有$s>0$ .曲率假设的进一步放宽也是可能的。证明了多项式增长的古解的线性空间具有有限维,且这些解是时间多项式。

英文摘要:

An explicit representation formula for all positive ancient solutions of the heat equation in the Euclidean case is found. In the Riemannian case with nonnegative Ricci curvature, a similar but less explicit formula is also found. Here it is proven that any positive ancient solution is the standard Laplace transform of positive solutions of the family of elliptic operator $Δ- s$ with $s>0$. Further relaxation of the curvature assumption is also possible. It is also shown that the linear space of ancient solutions of polynomial growth has finite dimension and these solutions are polynomials in time.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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