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Mathematics of Computation

Published by the American Mathematical Society since 1960 (published as Mathematical Tables and other Aids to Computation 1943-1959), Mathematics of Computation is devoted to research articles of the highest quality in computational mathematics.

ISSN 1088-6842 (online) ISSN 0025-5718 (print)

The 2024 MCQ for Mathematics of Computation is 1.78.

What is MCQ? The Mathematical Citation Quotient (MCQ) measures journal impact by looking at citations over a five-year period. Subscribers to MathSciNet may click through for more detailed information.

 

Semiexplicit symplectic integrators for non-separable Hamiltonian systems
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by Buddhika Jayawardana and Tomoki Ohsawa;
Math. Comp. 92 (2023), 251-281
DOI: https://doi.org/10.1090/mcom/3778
Published electronically: September 23, 2022

Abstract:

We construct a symplectic integrator for non-separable Hamiltonian systems combining an extended phase space approach of Pihajoki and the symmetric projection method. The resulting method is semiexplicit in the sense that the main time evolution step is explicit whereas the symmetric projection step is implicit. The symmetric projection binds potentially diverging copies of solutions, thereby remedying the main drawback of the extended phase space approach. Moreover, our semiexplicit method is symplectic in the original phase space. This is in contrast to existing extended phase space integrators, which are symplectic only in the extended phase space. We demonstrate that our method exhibits an excellent long-time preservation of invariants, and also that it tends to be as fast as and can be faster than Tao’s explicit modified extended phase space integrator particularly for small enough time steps and with higher-order implementations and for higher-dimensional problems.
References
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Bibliographic Information
  • Buddhika Jayawardana
  • Affiliation: Department of Mathematical Sciences, The University of Texas at Dallas, 800 W Campbell Rd, Richardson, Texas 75080-3021
  • Email: buddhika.jayawardana@utdallas.edu
  • Tomoki Ohsawa
  • Affiliation: Department of Mathematical Sciences, The University of Texas at Dallas, 800 W Campbell Rd, Richardson, Texas 75080-3021
  • MR Author ID: 892043
  • ORCID: 0000-0002-1367-9492
  • Email: tomoki@utdallas.edu
  • Received by editor(s): November 22, 2021
  • Received by editor(s) in revised form: June 21, 2022
  • Published electronically: September 23, 2022
  • Additional Notes: This work was supported by NSF grant DMS-2006736.
  • © Copyright 2022 American Mathematical Society
  • Journal: Math. Comp. 92 (2023), 251-281
  • MSC (2020): Primary 37M15, 65P10
  • DOI: https://doi.org/10.1090/mcom/3778
  • MathSciNet review: 4496965