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arXiv 1003.0707math.APmath-phmath.MP
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等变波映射的稳定自相似爆破

On stable self-similar blow up for equivariant wave maps

Roland Donninger

摘要:

本文考虑从(3+1)Minkowski空间到三球面的共旋波映射.这是一个能量超临界模型,已知它通过自相似解表现出有限时间爆破。基态自相似解$f_0$是已知的封闭形式和基于数值的,它应该描述系统的一般爆破行为。在假设$f_0$不存在不稳定模式的条件下,证明了通过$f_0$的爆破是稳定的.这个条件等价于线性二阶普通微分算子的谱假设。换句话说,我们把稳定爆破问题归结为一个线性常微分方程谱问题。虽然我们目前还不能严格地验证$f_0$的模式稳定性,但已知可能的不稳定本征值被限制在复平面中的某个紧凑区域内。因此,可以应用高度可靠的数值技术,并且所有可用的结果都强烈表明不存在不稳定模式,即,假设的$f_0$模式稳定性。

英文摘要:

We consider co--rotational wave maps from (3+1) Minkowski space into the three--sphere. This is an energy supercritical model which is known to exhibit finite time blow up via self-similar solutions. The ground state self--similar solution $f_0$ is known in closed form and based on numerics, it is supposed to describe the generic blow up behavior of the system. We prove that the blow up via $f_0$ is stable under the assumption that $f_0$ does not have unstable modes. This condition is equivalent to a spectral assumption for a linear second order ordinary differential operator. In other words, we reduce the problem of stable blow up to a linear ODE spectral problem. Although we are unable, at the moment, to verify the mode stability of $f_0$ rigorously, it is known that possible unstable eigenvalues are confined to a certain compact region in the complex plane. As a consequence, highly reliable numerical techniques can be applied and all available results strongly suggest the nonexistence of unstable modes, i.e., the assumed mode stability of $f_0$.

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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