Amplitude equations are used to describe the onset of instability in wide classes of partial differential equations (PDEs). One goal of the field is to determine simple universal/generic PDEs, to which many other classes of equations can be reduced, at least on a sufficiently long approximating time scale. In this work, we study the case when the reaction terms are nonlocal. In particular, we consider quadratic and cubic convolution-type nonlinearities. As a benchmark problem, we use the Swift-Hohenberg equation. The resulting amplitude equation is a Ginzburg-Landau PDE, where the coefficients can be calculated from the kernels. Our proof relies on separating critical and noncritical modes in Fourier space in combination with suitable kernel bounds.
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July 2018
Research Article|
July 24 2018
Validity of amplitude equations for nonlocal nonlinearities Available to Purchase
Christian Kuehn;
Christian Kuehn
a)
Technical University of Munich, Faculty of Mathematics, Research Unit “Multiscale and Stochastic Dynamics,”
85748 Garching b. München, Germany
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Sebastian Throm
Sebastian Throm
b)
Technical University of Munich, Faculty of Mathematics, Research Unit “Multiscale and Stochastic Dynamics,”
85748 Garching b. München, Germany
Search for other works by this author on:
Christian Kuehn
a)
Technical University of Munich, Faculty of Mathematics, Research Unit “Multiscale and Stochastic Dynamics,”
85748 Garching b. München, Germany
Sebastian Throm
b)
Technical University of Munich, Faculty of Mathematics, Research Unit “Multiscale and Stochastic Dynamics,”
85748 Garching b. München, Germany
a)
Electronic mail: [email protected]
b)
Electronic mail: [email protected]
J. Math. Phys. 59, 071510 (2018)
Article history
Received:
June 27 2017
Accepted:
July 01 2018
Citation
Christian Kuehn, Sebastian Throm; Validity of amplitude equations for nonlocal nonlinearities. J. Math. Phys. 1 July 2018; 59 (7): 071510. https://doi.org/10.1063/1.4993112
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