Abstract
This paper focuses on the stability analysis of WKB approximate solutions in geometric optics with the absence of strong transparency conditions under the terminology of Joly, Métivier and Rauch. We introduce a compatible condition and a singular localization method which allows us to prove the stability of WKB solutions over long time intervals. This compatible condition is weaker than the strong transparency condition. The singular localization method allows us to do delicate analysis near resonances. As an application, we show the long time approximation of Klein–Gordon equations by Schrödinger equations in the non-relativistic limit regime.
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Communicated by Laure Saint-Raymond
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Lu, Y., Zhang, Z. Partially Strong Transparency Conditions and a Singular Localization Method In Geometric Optics. Arch Rational Mech Anal 222, 245–283 (2016). https://doi.org/10.1007/s00205-016-1000-4
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DOI: https://doi.org/10.1007/s00205-016-1000-4