Abstract
This paper presents a rigorous study, for Fermi–Pasta–Ulam (FPU) chains with large particle numbers, of the formation of a packet of modes with geometrically decaying harmonic energies from an initially excited single low-frequency mode and the metastability of this packet over longer time scales. The analysis uses modulated Fourier expansions in time of solutions to the FPU system, and exploits the existence of almost-invariant energies in the modulation system. The results and techniques apply to the FPU α- and β-models as well as to higher-order nonlinearities. They are valid in the regime of scaling between particle number and total energy in which the FPU system can be viewed as a perturbation to a linear system, considered over time scales that go far beyond standard perturbation theory. Weak non-resonance estimates for the almost-resonant frequencies determine the time scales that can be covered by this analysis.
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References
Bambusi D., Ponno A.: On metastability in FPU. Commun. Math. Phys. 264, 539–561 (2006)
Bambusi D., Ponno A.: Resonance, metastability and blow up in FPU. Lect. Notes Phys. 728, 191 (2008)
Benettin, G., Carati, A., Galgani, L., Giorgilli, A.: The Fermi-Pasta-Ulam Problem and the Metastability Perspective. The Fermi-Pasta-Ulam Problem, Lecture Notes in Physics, vol. 728, pp. 152–189. Springer, Berlin, 2008
Benettin G., Gradenigo G.: A study of the Fermi–Pasta–Ulam problem in dimension two. Chaos Interdiscip. J. Nonlinear Sci. 18, 013112 (2008)
Benettin G., Livi R., Ponno A.: The Fermi–Pasta–Ulam problem: scaling laws vs. initial conditions. J. Stat. Phys. 135(5), 873–893 (2009)
Berchialla L., Galgani L., Giorgilli A.: Localization of energy in FPU chains. Discrete Contin. Dyn. Syst. (DCDS-A) 11(4), 855–866 (2004)
Berman G.P., Izrailev F.M.: The Fermi–Pasta–Ulam problem: fifty years of progress. Chaos Interdiscip. J. Nonlinear Sci. 15, 015104 (2005)
Cohen D., Hairer E., Lubich C.: Numerical energy conservation for multi-frequency oscillatory differential equations. BIT 45, 287–305 (2005)
Cohen D., Hairer E., Lubich C.: Long-time analysis of nonlinearly perturbed wave equations via modulated Fourier expansions. Arch. Ration. Mech. Anal. 187, 341–368 (2008)
DeLuca J., Lichtenberg A.J., Ruffo S.: Energy transitions and time scales to equipartition in the Fermi–Pasta–Ulam oscillator chain. Phys. Rev. E 51, 2877–2885 (1995)
Fermi, E., Pasta, J., Ulam, S.: Studies of Non Linear Problems. Tech. Report LA-1940, Los Alamos, 1955, Later published in E. Fermi: Collected Papers Chicago 1965 and reprinted in [14]
Flach S., Ivanchenko M.V., Kanakov O.I.: q-Breathers in Fermi–Pasta–Ulam chains: existence, localization, and stability. Phys. Rev. E 73, 036618 (2006)
Ford J.: The Fermi–Pasta–Ulam problem: paradox turns discovery. Phys. Rep. 213, 271–310 (1992)
Gallavotti, G. (ed.): The Fermi–Pasta–Ulam Problem. A Status Report, Lecture Notes in Physics, vol. 728. Springer, Berlin, 2008
Gauckler, L.: Long-Time Analysis of Hamiltonian Partial Differential Equations and Their Discretizations. Ph.D. thesis, Univ. Tübingen, 2010
Gauckler L., Lubich C.: Nonlinear Schrödinger equations and their spectral semi-discretizations over long times. Found. Comput. Math. 10, 141–169 (2010)
Hairer E., Lubich C.: Long-time energy conservation of numerical methods for oscillatory differential equations. SIAM J. Numer. Anal. 38, 414–441 (2001)
Hairer, E., Lubich, C., Wanner, G.: Geometric Numerical Integration. Structure-Preserving Algorithms for Ordinary Differential Equations, 2nd edn. Springer Series in Computational Mathematics, vol. 31. Springer, Berlin, 2006
Paleari, S., Penati, T.: Numerical Methods and Results in the FPU Problem. The Fermi–Pasta–Ulam Problem, Lecture Notes in Physics, vol. 728, pp. 239–282. Springer, Berlin, 2008
Weissert T.P.: The Genesis of Simulation in Dynamics: Pursuing the Fermi–Pasta–Ulam Problem. Springer, New York (1997)
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Hairer, E., Lubich, C. On the Energy Distribution in Fermi–Pasta–Ulam Lattices. Arch Rational Mech Anal 205, 993–1029 (2012). https://doi.org/10.1007/s00205-012-0526-3
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DOI: https://doi.org/10.1007/s00205-012-0526-3