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arXiv 2005.14128math.APmath.DG
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波映射的Bubbling的非唯一性

Non-Uniqueness of Bubbling for Wave Maps

Max Engelstein, Dana Mendelson

摘要:

我们考虑从$\mathbb R^{2+1}$到一个$C^\infty$ -光滑黎曼流形$\mathcal N$的波映射.这样的映射可以表现出能量集中,并且在集中点处,已知映射(适当地重新缩放和平移)微弱地收敛到谐波映射,称为气泡。我们给出了一个例子的波地图,表现出一种类型的非唯一性的冒泡。特别是,我们展示了一个连续的不同的泡沫在原点,其中每一个出现的弱极限沿着不同的时间序列接近爆破时间。这是第一个已知的例子,非唯一性鼓泡色散方程。我们的构造受到Peter Topping [Topping 2004]的工作的启发,他证明了类似的现象可以发生在调和映射热流的设置中,并且我们的非唯一性机制是与该工作中表现出的相同的“缠绕”行为。

英文摘要:

We consider wave maps from $\mathbb R^{2+1}$ to a $C^\infty$-smooth Riemannian manifold, $\mathcal N$. Such maps can exhibit energy concentration, and at points of concentration, it is known that the map (suitably rescaled and translated) converges weakly to a harmonic map, known as a bubble. We give an example of a wave map which exhibits a type of non-uniqueness of bubbling. In particular, we exhibit a continuum of different bubbles at the origin, each of which arise as the weak limit along a different sequence of times approaching the blow-up time. This is the first known example of non-uniqueness of bubbling for dispersive equations. Our construction is inspired by the work of Peter Topping [Topping 2004], who demonstrated a similar phenomena can occur in the setting of harmonic map heat flow, and our mechanism of non-uniqueness is the same 'winding' behavior exhibited in that work.

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