# American Institute of Mathematical Sciences

August  2016, 9(4): 1109-1118. doi: 10.3934/dcdss.2016044

## Normal forms à la Moser for aperiodically time-dependent Hamiltonians in the vicinity of a hyperbolic equilibrium

 1 School of Mathematics, University of Bristol, Bristol BS8 1TW, United Kingdom, United Kingdom

Received  March 2015 Revised  August 2015 Published  August 2016

The classical theorem of Moser, on the existence of a normal form in the neighbourhood of a hyperbolic equilibrium, is extended to a class of real-analytic Hamiltonians with aperiodically time-dependent perturbations. A stronger result is obtained in the case in which the perturbing function exhibits a time decay.
Citation: Alessandro Fortunati, Stephen Wiggins. Normal forms à la Moser for aperiodically time-dependent Hamiltonians in the vicinity of a hyperbolic equilibrium. Discrete & Continuous Dynamical Systems - S, 2016, 9 (4) : 1109-1118. doi: 10.3934/dcdss.2016044
##### References:
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##### References:
 [1] L. Chierchia and G. Gallavotti, Drift and diffusion in phase space,, Ann. Inst. H. Poincaré Phys. Théor., 60 (1994).   Google Scholar [2] A. Fortunati and S. Wiggins, Persistence of Diophantine flows for quadratic nearly integrable Hamiltonians under slowly decaying aperiodic time dependence,, Regul. Chaotic Dyn., 19 (2014), 586.  doi: 10.1134/S1560354714050062.  Google Scholar [3] A. Fortunati and S. Wiggins, A Kolmogorov theorem for nearly integrable Poisson systems with asymptotically decaying time-dependent perturbation,, Regul. Chaotic Dyn., 20 (2015), 476.  doi: 10.1134/S1560354715040061.  Google Scholar [4] G. Gallavotti, Hamilton-Jacobi's equation and Arnold's diffusion near invariant tori in a priori unstable isochronous systems,, Rend. Sem. Mat. Univ. Politec. Torino, 55 (1997), 291.   Google Scholar [5] A. Giorgilli, On a Theorem of Lyapounov,, Rendiconti dell'Istituto Lombardo Accademia di Scienze e Lettere, 146 (2012), 133.   Google Scholar [6] A. Giorgilli, Persistence of invariant tori.,, , ().   Google Scholar [7] A. Giorgilli, Exponential stability of Hamiltonian systems,, in Dynamical systems. Part I, (2003), 87.   Google Scholar [8] A. Giorgilli and E. Zehnder, Exponential stability for time dependent potentials,, Z. Angew. Math. Phys., 43 (1992), 827.  doi: 10.1007/BF00913410.  Google Scholar [9] J. Moser, The analytic invariants of an area-preserving mapping near a hyperbolic fixed point,, Comm. Pure Appl. Math., 9 (1956), 673.  doi: 10.1002/cpa.3160090404.  Google Scholar
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