Abstract
In some physical applications, the decaying rate of asymptotically decaying solution is more important than the solution magnitude itself in understanding the physical system such as the late-time behavior of decaying fields in black hole space-time. In Khanna (J Sci Comput 56(2):366–380, 2013), it was emphasized that high-precision arithmetic and high-order methods are required to capture numerically the correct decaying rate of the late-time radiative tails of black-hole system in order to prevent roundoff errors from inducing a wrong power-law decay rate in the numerical approximation. In this paper, we explain how roundoff errors induce a wrong decay mode in the numerical approximation using simple linear differential equations. Then we describe the orthogonal decomposition method as a possible technique to remove wrong decaying modes induced by roundoff errors in the numerical approximation.






















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The authors sincerely thank the two anonymous reviewers whose comments helped them to understand the problem better and improve their paper.
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Nicponski, J., Jung, JH. A Note on High-Precision Approximation of Asymptotically Decaying Solution and Orthogonal Decomposition. J Sci Comput 76, 189–215 (2018). https://doi.org/10.1007/s10915-017-0619-0
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DOI: https://doi.org/10.1007/s10915-017-0619-0