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arXiv · 2601.20566

Local convergence analysis of a linearized Alikhanov scheme for the time fractional sine-Gordon equation

Chang Hou·Hu Chen
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Abstract

This paper investigates the time fractional sine-Gordon equation whose solution exhibits a weak singularity of type t^{\alpha}. By means of the Alikhanov formula we derive a fully discrete, linearized scheme. Using the more general regularity assumption, we derive a sharp truncation-error bound for the fractional derivative. Furthermore, we prove a key inequality and a less restrictive stability result that is valid on general graded temporal meshes. Consequently, the temporal local convergence order is shown to be min{2, r} in H^1-seminorm, where r is the degree of grading; numerical experiments confirm that the optimal rate is already attained as soon as r = 2.

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Chang Hou, Hu Chen. 2026-01-28. Local convergence analysis of a linearized Alikhanov scheme for the time fractional sine-Gordon equation. https://arxiv.org/abs/2601.20566

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