Error estimates for Gaussian beam superpositions
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- by Hailiang Liu, Olof Runborg and Nicolay M. Tanushev PDF
- Math. Comp. 82 (2013), 919-952 Request permission
Abstract:
Gaussian beams are asymptotically valid high frequency solutions to hyperbolic partial differential equations, concentrated on a single curve through the physical domain. They can also be extended to some dispersive wave equations, such as the Schrödinger equation. Superpositions of Gaussian beams provide a powerful tool to generate more general high frequency solutions that are not necessarily concentrated on a single curve. This work is concerned with the accuracy of Gaussian beam superpositions in terms of the wavelength $\varepsilon$. We present a systematic construction of Gaussian beam superpositions for all strictly hyperbolic and Schrödinger equations subject to highly oscillatory initial data of the form $Ae^{i\Phi /\varepsilon }$. Through a careful estimate of an oscillatory integral operator, we prove that the $k$-th order Gaussian beam superposition converges to the original wave field at a rate proportional to $\varepsilon ^{k/2}$ in the appropriate norm dictated by the well-posedness estimate. In particular, we prove that the Gaussian beam superposition converges at this rate for the acoustic wave equation in the standard, $\varepsilon$-scaled, energy norm and for the Schrödinger equation in the $L^2$ norm. The obtained results are valid for any number of spatial dimensions and are unaffected by the presence of caustics. We present a numerical study of convergence for the constant coefficient acoustic wave equation in $\mathbb {R}^2$ to analyze the sharpness of the theoretical results.References
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Additional Information
- Hailiang Liu
- Affiliation: Department of Mathematics, Iowa State University, Ames, Iowa 50011
- Email: hliu@iastate.edu
- Olof Runborg
- Affiliation: Department of Numerical Analysis, CSC, KTH, 100 44 Stockholm, Sweden – and – Swedish e-Science Research Center (SeRC), KTH, 100 44 Stockholm, Sweden
- Email: olofr@nada.kth.se
- Nicolay M. Tanushev
- Affiliation: Department of Mathematics, The University of Texas at Austin, 1 University Station, C1200, Austin, Texas 78712
- Address at time of publication: Z-Terra Inc., 17171 Park Row, Suite 247, Houston, Texas 77084
- Email: nicktan@math.utexas.edu
- Received by editor(s): August 6, 2010
- Received by editor(s) in revised form: June 2, 2011, and August 31, 2011
- Published electronically: November 6, 2012
- © Copyright 2012
American Mathematical Society
The copyright for this article reverts to public domain 28 years after publication. - Journal: Math. Comp. 82 (2013), 919-952
- MSC (2010): Primary 35J10, 35L05, 35A35, 41A60, 35L30
- DOI: https://doi.org/10.1090/S0025-5718-2012-02656-1
- MathSciNet review: 3008843