Abstract
This article focuses on computing Hamiltonian matrix exponential. Given a Hamiltonian matrix \(\mathcal {H}\), it is well-known that the matrix exponential \(e^{\mathcal {H}}\) is a symplectic matrix and its eigenvalues form reciprocal \((\lambda ,1/\bar{\lambda })\). It is important to take care of the symplectic structure for computing \(e^{\mathcal {H}}\). Based on the structure-preserving flow proposed by Kuo et al. (SIAM J Matrix Anal Appl 37:976–1001, 2016), we develop a numerical method for computing the symplectic matrix pair \((\mathcal {M},\mathcal {L})\) which represents \(e^{\mathcal {H}}\).
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We thank the Editor, Professor Volker Mehrmann, and the anonymous referees for their careful reading, valuable comments and suggestions on the manuscript.
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Kuo, YC., Lin, WW. & Shieh, SF. A structure preserving flow for computing Hamiltonian matrix exponential. Numer. Math. 143, 555–582 (2019). https://doi.org/10.1007/s00211-019-01065-3
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DOI: https://doi.org/10.1007/s00211-019-01065-3