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arXiv · 2212.14398

An Ultra-Weak Space-Time Variational Formulation for the Schr\"odinger Equation

Stefan Hain·Karsten Urban
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Abstract

We present a well-posed ultra-weak space-time variational formulation for the time-dependent version of the linear Schr\"odinger equation with an instationary Hamiltonian. We prove optimal inf-sup stability and introduce a space-time Petrov-Galerkin discretization with optimal discrete inf-sup stability. We show norm-preservation of the ultra-weak formulation. The inf-sup optimal Petrov-Galerkin discretization is shown to be asymptotically norm-preserving, where the deviation is shown to be in the order of the discretization. In addition, we introduce a Galerkin discretization, which has suboptimal inf-sup stability but exact norm-preservation. Numerical experiments underline the performance of the ultra-weak space-time variational formulation, especially for non-smooth initial data.

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Stefan Hain, Karsten Urban. 2022-12-29. An Ultra-Weak Space-Time Variational Formulation for the Schr\"odinger Equation. https://arxiv.org/abs/2212.14398

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