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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Mathematische Annalen 277 (1987), S. 121-133 
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 43 (1992), S. 449-470 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Bifurkation in unbeschränkten Gebieten führt häufig auf spontane Musterbildung. Dabei wird ein periodisches Grundmuster, das aus dem linearen System ableitbar ist, durch nichtlineare Effekte auf großen Raum- und Zeitskalen moduliert. Die Modulation der Amplitude wird meist durch die Ginzburg-Landau-Gleichung beschrieben. Für die Untersuchung solcher System entwickeln wir ein Verallgemeinerung des Lyapunov-Schmidtschen Reduktionsverfahren, das die Behandlung eines kontinuierlichen Spektrums erlaubt. Damit können wir parabolische Systeme in Plattengebieten auf ein niedrigdimensionaleres Problem zurückführen, das im Linearteil eine partielle Differentialgleichung bezüglich der unbeschränkten Variablen ist, das aber im Nichtlinearteil auch nichtlokale Terme enthält. Unter Verwendung des Modulationsansatzes mit großen Zeit- und Raumskalen führt die Entwicklung nach dem Bifurkations-parameter zu lokalen Termen, die Ableitungen der Amplitudenfunktion enthalten. Wir erhalten genau die klassischen Modulationsgleichungen vom Ginzburg-Landau-Typ.
    Notes: Abstract Bifurcation problems in unbounded domains often lead to spontaneous pattern formation. A basic periodic pattern, derivable from the linearized system, is modulated by nonlinear effects on a slow time and space scale. The modulation of the amplitude is usually described by equations of Ginzburg-Landau type. To study such problems we develop a generalized Lyapunov-Schmidt reduction procedure which allows to treat the case of continuous spectra. Thus, we are able to reduce parabolic systems in plate-like domains to a lower dimensional problem, which is, to first order, a partial differential equation in the unbounded variables only, but contains also non-local terms in the nonlinearity. Using a modulation ansatz with slow time and space variables, the expansion in terms of the bifurcation parameter transfers the non-local terms into local ones involving derivatives of the amplitude function. Thus, we recover the classical modulation equations of Ginzburg-Landau type.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Communications in mathematical physics 189 (1997), S. 829-853 
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract: We develop a method for the stability analysis of bifurcating spatially periodic patterns under general nonperiodic perturbations. In particular, it enables us to detect sideband instabilities. We treat in all detail the stability question of roll solutions in the two–dimensional Swift–Hohenberg equation and derive a condition on the amplitude and the wave number of the rolls which is necessary and sufficent for stability. Moreover, we characterize the set of those wave vectors which give rise to unstable perturbations. Dedicated to Professor K. Kirchgässner on the occasion of his sixty-fifth birthday
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Communications in mathematical physics 199 (1998), S. 71-97 
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract: The Ginzburg–Landau equation on the real line has spatially periodic steady states of the form , with and . For , , we construct solutions which converge for all t〉0 to the limiting pattern as . These solutions are stable with respect to sufficiently small perturbations, and behave asymptotically in time like , where is uniquely determined by the boundary conditions . This extends a previous result of [BrK92] by removing the assumption that should be close to zero. The existence of the limiting profile is obtained as an application of the theory of monotone operators, and the long-time behavior of our solutions is controlled by rewriting the system in scaling variables and using energy estimates involving an exponentially growing damping term.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 44 (1993), S. 386-388 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 47 (1996), S. 338-340 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 46 (1995), S. 820-822 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 41 (1990), S. 928-932 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Archive for rational mechanics and analysis 129 (1995), S. 101-127 
    ISSN: 1432-0673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract The “spatial dynamics” approach is applied to the analysis of bifurcations of the three-dimensional Poiseuille flow between parallel plates. In contrast to the classical studies, we impose time periodicity as well as spatial periodicity with period 2π/α in the streamwise direction. However, we make no assumptions on the behavior in the spanwise direction, except the uniform closeness of the bifurcating solution to the basic flow. In an abstract setting it is shown how the dimension of the critical eigenspace of the spatial dynamics analysis can be uniquely determined from the classical linear stability problem. For the three-dimensional Poiseuille problem we are able to find all relevant coefficients from the analysis of the purely two-dimensional problem. Moreover, we are able to analyze precisely the influence of a spanwise pressure gradient and the associated spanwise mass flux. The study of the reduced problem shows that there are two different kinds of solutions (spirals and ribbons) which are 2αp/β periodic in the spanwise direction, as in the Couette-Taylor problem, and both of them bifurcate in the same direction.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Archive for rational mechanics and analysis 133 (1995), S. 145-198 
    ISSN: 1432-0673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract The existence and linear stability problem for the Stokes periodic wavetrain on fluids of finite depth is formulated in terms of the spatial and temporal Hamiltonian structure of the water-wave problem. A proof, within the Hamiltonian framework, of instability of the Stokes periodic wavetrain is presented. A Hamiltonian center-manifold analysis reduces the linear stability problem to an ordinary differential eigenvalue problem on ℝ4. A projection of the reduced stability problem onto the tangent space of the 2-manifold of periodic Stokes waves is used to prove the existence of a dispersion relation Λ(λ,σ, I 1, I 2)=0 where λ ε ℂ is the stability exponent for the Stokes wave with amplitude I 1 and mass flux I 2 and σ is the “sideband’ or spatial exponent. A rigorous analysis of the dispersion relation proves the result, first discovered in the 1960's, that the Stokes gravity wavetrain of sufficiently small amplitude is unstable for F ε (0,F0) where F 0 ≈ 0.8 and F is the Froude number.
    Type of Medium: Electronic Resource
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