Vanishing Pohozaev constant and removability of singularities

Vanishing Pohozaev constant and removability of singularities
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Pohozaev 消失常数和奇点可去除性

DOI:
10.4310/jdg/1547607688
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发表时间:
2017-09
影响因子:
2.5
通讯作者:
Miaomiao Zhu
Miaomiao Zhu
中科院分区:
数学1区
文献类型:
--
作者:
Jürgen Jost;Chunqin Zhou;Miaomiao Zhu

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二维变分问题的保形不变性是解的爆破分析和推导奇点可移性的一个已知条件。在本文中,我们给出了奇点可移性的另一个充分且必要的条件。这就是Pohozaev身份的有效性。在这种恒等式不成立的情况下,我们引入一个新的量,称为Pohozaev常数,它一方面测量Pohozaev恒等式失效的程度,另一方面提供解在孤立奇点处的奇异行为的表征。我们将此应用于具有圆锥奇点的Riemann曲面上的超liouville型方程的爆炸分析,因为在这种奇点的存在下,保形不变量不再成立,除非Pohozaev常数消失,否则局部奇点通常是不可去除的。
Conformal invariance of two-dimensional variational problems is a condition known to enable a blow-up analysis of solutions and to deduce the removability of singularities. In this paper, we identify another condition that is not only sufficient, but also necessary for such a removability of singularities. This is the validity of the Pohozaev identity. In situations where such an identity fails to hold, we introduce a new quantity, called the {\it Pohozaev constant}, which on one hand measures the extent to which the Pohozaev identity fails and on the other hand provides a characterization of the singular behavior of a solution at an isolated singularity. We apply this to the blow-up analysis for super-Liouville type equations on Riemann surfaces with conical singularities, because in the presence of such singularities, conformal invariance no longer holds and a local singularity is in general non-removable unless the Pohozaev constant is vanishing.
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