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arXiv 1602.01055math.DG
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弯曲乘积孤子的Pohozaev恒等式

A Pohozaev Identity on Warped Product Solitons

Timothy Carson

摘要:

翘曲积度量是关于向量积$B \times F$的一类黎曼度量,它已经被很好地研究并提供了一组丰富的例子。本文考虑了作为弯曲乘积度量的收缩梯度Ricci孤子。证明了如果度量的曲率有界且基$B$是二维的,则度量实际上一定是一个向量积.该定理是Pohozaev型恒等式的一个推论。这与在$\mathbb{R}^2$中研究反应扩散方程$\partial_t v = Δv + e^v$解的爆破结果非常相似。

英文摘要:

Warped product metrics are a class of Riemannian metrics on cross products $B \times F$ which have been well studied and provide a rich set of examples. In this paper we consider shrinking gradient Ricci solitons which are warped product metrics. We prove that if the curvature of the metric is bounded and the base $B$ has two dimensions, the metric must in fact be a cross product. The theorem is a consequence of a Pohozaev-type identity. This closely parallels results in the study of blow-ups of solutions to the reaction- diffusion equation $\partial_t v = Δv + e^v$ in $\mathbb{R}^2$ .

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