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Employing nonresonant step sizes for time integration of highly oscillatory nonlinear Dirac equations

Jahnke, Tobias 1; Kirn, Michael 1
1 Institut für Angewandte und Numerische Mathematik (IANM), Karlsruher Institut für Technologie (KIT)

Abstract:

In the nonrelativistic limit regime, nonlinear Dirac equations involve a small parameter ε>0 which induces rapid temporal oscillations with frequency proportional to ε2. Efficient time integrators are challenging to construct, since their accuracy has to be independent of ε or improve with smaller values of ε. In [10], Yongyong Cai and Yan Wang have presented a nested Picard iterative integrator (NPI-2), which is a uniformly accurate second-order scheme. We propose a novel method called the 'nonresonant nested Picard iterative integrator (NRNPI)', which takes advantage of cancellation effects in the global error to significantly simplify the NPI-2. We prove that for non-resonant step sizes τπ4ε2, the NRNPI has the same accuracy as the 4NPI-2 and is thus more efficient. Moreover, we show that for arbitrary τ<π4ε2 the error decreases proportionally to ε2τ . We provide numerical experiments to illustrate the error behavior as well as the efficiency gain.

Zugehörige Institution(en) am KIT Institut für Angewandte und Numerische Mathematik (IANM)
Sonderforschungsbereich 1173 (SFB 1173)
Publikationstyp Forschungsbericht/Preprint
Publikationsmonat/-jahr 11.2024
Sprache Englisch
Identifikator ISSN: 2365-662X
KITopen-ID: 1000175882
Verlag Karlsruher Institut für Technologie (KIT)
Umfang 36 S.
Serie CRC 1173 Preprint ; 2024/23
Projektinformation SFB 1173/3 (DFG, DFG KOORD, SFB 1173/3)
Externe Relationen Siehe auch
Schlagwörter nonlinear Dirac equation, nonrelativistic limit regime, highly oscillatory problems, time integration, error bounds, resonances

Volltext §
DOI: 10.5445/IR/1000175882
Veröffentlicht am 05.11.2024
Seitenaufrufe: 31
seit 18.11.2024
Downloads: 17
seit 19.11.2024
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