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arXiv 1010.5461math.AP
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自相似碎裂和增长碎裂方程的渐近剖面的收敛速率

Rate of convergence to an asymptotic profile for the self-similar fragmentation and growth-fragmentation equations

María J. Cáceres, José A. Cañizo, Stéphane Mischler

摘要:

研究了\partial_t g = Dg + Lg - λg型线性发展方程的渐近性态,其中L是碎裂算子,D是微分算子,λ是Dg + Lg的最大特征值.当Dg = - \partial_x g时,该方程是细胞生长模型生长碎裂方程的重标度;在Dg = -\partial_x g的情况下,已知λ = 2,该方程是自相似碎裂方程,与碎裂方程\partial_t f = Lf的解的自相似行为密切相关.利用熵-熵耗散不等式,给出了线性发展方程在适当归一化条件下,g指数快速收敛到定态G的一般条件.在上面提到的两种情况下,我们证明了这些条件在很宽的碎裂系数范围内都满足,所以指数收敛成立。

英文摘要:

We study the asymptotic behavior of linear evolution equations of the type \partial_t g = Dg + Lg - λg, where L is the fragmentation operator, D is a differential operator, and λ is the largest eigenvalue of the operator Dg + Lg. In the case Dg = -\partial_x g, this equation is a rescaling of the growth-fragmentation equation, a model for cellular growth; in the case Dg = -x \partial_x g, it is known that λ = 2 and the equation is the self-similar fragmentation equation, closely related to the self-similar behavior of solutions of the fragmentation equation \partial_t f = Lf. By means of entropy-entropy dissipation inequalities, we give general conditions for g to converge exponentially fast to the steady state G of the linear evolution equation, suitably normalized. In both cases mentioned above we show these conditions are met for a wide range of fragmentation coefficients, so the exponential convergence holds.

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