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arXiv 2103.05739math.NAcs.NAmath.AP
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球面上最优输运的收敛框架

A convergence framework for optimal transport on the sphere

Brittany Froese Hamfeldt, Axel G. R. Turnquist

摘要:

我们考虑一个偏微分方程的方法来数值求解最优运输问题的球。我们专注于传统的平方测地线成本和对数成本,这是在反射器天线的设计问题。在球面上的每一点上,我们用一个广义的Monge-Ampère型方程代替表面偏微分方程,该方程用法坐标表示在切面上。由此产生的非线性偏微分方程,然后可以近似为任何一致的,单调计划的广义Monge-Ampère型方程在平面上。现有的技术证明收敛不立即适用,因为PDE缺乏比较原则和唯一的解决方案,这使得它很难产生一个稳定的,适定的计划。通过增加一个额外的项,约束解的梯度的离散化,我们得到一个强形式的稳定性。一个修改的Barles-Souganwestern收敛框架,然后建立收敛到原来的偏微分方程的均值零解。

英文摘要:

We consider a PDE approach to numerically solving the optimal transportation problem on the sphere. We focus on both the traditional squared geodesic cost and a logarithmic cost, which arises in the reflector antenna design problem. At each point on the sphere, we replace the surface PDE with a generalized Monge-Ampère type equation posed on the tangent plane using normal coordinates. The resulting nonlinear PDE can then be approximated by any consistent, monotone scheme for generalized Monge-Ampère type equations on the plane. Existing techniques for proving convergence do not immediately apply because the PDE lacks both a comparison principle and a unique solution, which makes it difficult to produce a stable, well-posed scheme. By augmenting this discretization with an additional term that constrains the solution gradient, we obtain a strong form of stability. A modification of the Barles-Souganidis convergence framework then establishes convergence to the mean-zero solution of the original PDE.

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