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On
geometric and analytic mixing scales: comparability and
convergence rates for transport problems
Christian Zillinger |
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Vol. 1 (2019), No. 4, 543–570
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DOI: 10.2140/paa.2019.1.543
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Abstract |
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We are interested in the geometric and analytic mixing scales of solutions to passive scalar problems. Here, we show that both notions are comparable after possibly removing large-scale projections. In order to discuss our techniques in a transparent way, we further introduce a dyadic model problem. In a second part of our article we consider the question of sharp decay rates for both scales for Sobolev regular initial data when evolving under the transport equation and related active and passive scalar equations. Here, we show that slightly faster rates than the expected algebraic decay rates are optimal. |
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Keywords
mixing, damping, transport, Walsh–Fourier
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Mathematical Subject Classification 2010
Primary: 76F25, 35Q35
Secondary: 42C10
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Milestones
Received: 8 May 2018
Revised: 4 April 2019
Accepted: 6 June 2019
Published: 12 October 2019
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Authors |
| Christian Zillinger | |
| Department of Mathematics University of Southern California Los Angeles, CA United States |
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