Uniqueness of Self-similar Solutions to Smoluchowski’s Coagulation Equations for Kernels that are Close to Constant

Uniqueness of Self-similar Solutions to Smoluchowski’s Coagulation Equations for Kernels that are Close to Constant
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接近常数的核的 Smoluchowski 凝固方程自相似解的唯一性

DOI:
10.1007/s10955-014-1070-3
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发表时间:
2013
影响因子:
1.6
通讯作者:
Juan J. L. Velázquez
Juan J. L. Velázquez
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
B. Niethammer;Juan J. L. Velázquez

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我们考虑Smoluchowski凝聚方程的自相似解,其中核$$K=K(x,y)$$K=K(x,y)是零次齐次的,并且在$$\开始{对齐} -\vareps\le K(x,y)的意义上接近常数。y)-2 \le \varepeil\Big(\Big(\frac{x}{y}\Big)^{\alpha } + \Big(\frac{y}{x}\Big)^{\alpha }\Big)\end{aligned}$$-ε≤K(x,y)-2≤ε((xy)α+(yx)α)for $$\alpha \in [0,1)$$α∈[0,1).我们证明了具有给定质量的自相似解是唯一的,如果$$\vareps $$ε是足够小的,这是第一个这样的唯一性结果的内核是不可解的。我们的证明依赖于一个收缩参数的规范,措施的解决方案的距离相对于弱拓扑的措施。
We consider self-similar solutions to Smoluchowski’s coagulation equation for kernels $$K=K(x,y)$$K=K(x,y) that are homogeneous of degree zero and close to constant in the sense that $$\begin{aligned} -\varepsilon \le K(x,y)-2 \le \varepsilon \Big ( \Big (\frac{x}{y}\Big )^{\alpha } + \Big (\frac{y}{x}\Big )^{\alpha }\Big ) \end{aligned}$$-ε≤K(x,y)-2≤ε((xy)α+(yx)α)for $$\alpha \in [0,1)$$α∈[0,1). We prove that self-similar solutions with given mass are unique if $$\varepsilon $$ε is sufficiently small which is the first such uniqueness result for kernels that are not solvable. Our proof relies on a contraction argument in a norm that measures the distance of solutions with respect to the weak topology of measures.
DOI: 10.1007/s00220-012-1553-5
发表时间: 2013
影响因子: 2.4
作者:
B. Niethammer;J. J. L. Veláquez
通讯作者: J. J. L. Veláquez