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Transactions of the American Mathematical Society

Published by the American Mathematical Society since 1900, Transactions of the American Mathematical Society is devoted to longer research articles in all areas of pure and applied mathematics.

ISSN 1088-6850 (online) ISSN 0002-9947 (print)

The 2020 MCQ for Transactions of the American Mathematical Society is 1.48.

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Justification of multidimensional single phase semilinear geometric optics
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by Jean-Luc Joly and Jeffrey Rauch PDF
Trans. Amer. Math. Soc. 330 (1992), 599-623 Request permission

Abstract:

For semilinear strictly hyperbolic systems $Lu= f(x,u)$, we construct and justify high frequency nonlinear asymptotic expansions of the form \[ {u^\varepsilon }(x)\sim \sum \limits _{j \geq 0} {{\varepsilon ^j}{U_j}(x,\varphi (x)/\varepsilon }, \quad L{u^\varepsilon } - f(x,{u^\varepsilon })\sim 0 .\] The study of the principal term of such expansions is called nonlinear geometric optics in the applied literature. We show (i) formal expansions with periodic profiles ${U_j}$ can be computed to all orders, (ii) the equations for the profiles from (i) are solvable, and (iii) there are solutions of the exact equations which have the formal series as high frequency asymptotic expansion.
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Additional Information
  • © Copyright 1992 American Mathematical Society
  • Journal: Trans. Amer. Math. Soc. 330 (1992), 599-623
  • MSC: Primary 35C20; Secondary 35L40, 35L60, 78A05
  • DOI: https://doi.org/10.1090/S0002-9947-1992-1073774-7
  • MathSciNet review: 1073774