Abstract
In this article we study the induced geodesic distance of fractional order Sobolev metrics on the groups of (volume preserving) diffeomorphisms and symplectomorphisms. The interest in these geometries is fueled by the observation that they allow for a geometric interpretation for prominent partial differential equations in the field of fluid dynamics. These include in particular the modified Constantin–Lax–Majda and surface quasi-geostrophic equations. The main result of this article shows that both of these equations stem from a Riemannian metric with vanishing geodesic distance.
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Acknowledgements
We would like to thank Martins Bruveris, Stefan Haller, Robert Jerrard, Cy Maor, Peter Michor, and Gerard Misiołek for helpful comments and discussions during the preparation of this manuscript.
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MB was partially supported by NSF-Grant 1912037 (collaborative research in connection with NSF-Grant 1912030). MB was also supported by a first year assistant professor award of the Florida State University. PH was supported by the Freiburg Institute of Advances Studies in the form of a Junior Fellowship. SCP was partially supported by Simons Foundation Collaboration Grant for Mathematicians No. 318969. SCP was also supported by a PSC-CUNY Award, jointly funded by The Professional Staff Congress and The City University of New York.
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Bauer, M., Harms, P. & Preston, S.C. Vanishing Distance Phenomena and the Geometric Approach to SQG. Arch Rational Mech Anal 235, 1445–1466 (2020). https://doi.org/10.1007/s00205-019-01449-7
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DOI: https://doi.org/10.1007/s00205-019-01449-7