Multibump homoclinic solutions for a class of second order, almost periodic Hamiltonian systems

1997 ◽  
Vol 4 (1) ◽  
pp. 77-99 ◽  
Author(s):  
V. Coti Zelati ◽  
P. Montecchiari ◽  
M. Nolasco
Keyword(s):  
Hamiltonian Systems ◽  
Second Order ◽  
Homoclinic Solutions ◽  
Almost Periodic

scholarly journals Homoclinic Solutions for a Class of Second Order Nonautonomous Singular Hamiltonian Systems

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
Ziheng Zhang ◽  
Fang-Fang Liao ◽  
Patricia J. Y. Wong
Keyword(s):  
Hamiltonian Systems ◽  
Bounded Function ◽  
Homoclinic Solution ◽  
Second Order ◽  
Homoclinic Solutions ◽  
Global Maximum ◽  
Continuous Bounded Function ◽  
Almost Periodic ◽  
Strong Force ◽  
Singular Hamiltonian Systems

We are concerned with the existence of homoclinic solutions for the following second order nonautonomous singular Hamiltonian systemsu¨+atWuu=0, (HS) where-∞<t<+∞,u=u1,u2, …,uN∈ℝNN≥3,a:ℝ→ℝis a continuous bounded function, and the potentialW:ℝN∖{ξ}→ℝhas a singularity at0≠ξ∈ℝN, andWuuis the gradient ofWatu. The novelty of this paper is that, for the case thatN≥3and (HS) is nonautonomous (neither periodic nor almost periodic), we show that (HS) possesses at least one nontrivial homoclinic solution. Our main hypotheses are the strong force condition of Gordon and the uniqueness of a global maximum ofW. Different from the cases that (HS) is autonomousat≡1or (HS) is periodic or almost periodic, as far as we know, this is the first result concerning the case that (HS) is nonautonomous andN≥3. Besides the usual conditions onW, we need the assumption thata′t<0for allt∈ℝto guarantee the existence of homoclinic solution. Recent results in the literature are generalized and significantly improved.

Homoclinics for strongly indefinite almost periodic second order Hamiltonian systems

2017 ◽  
Vol 8 (1) ◽  
pp. 372-385
Author(s):  
Alexander Pankov
Keyword(s):  
Hamiltonian Systems ◽  
Careful Analysis ◽  
Energy Functional ◽  
Nehari Manifold ◽  
Second Order ◽  
Homoclinic Solutions ◽  
Almost Periodic ◽  
Second Order Hamiltonian Systems

Abstract Under certain assumptions, we prove the existence of homoclinic solutions for almost periodic second order Hamiltonian systems in the strongly indefinite case. The proof relies on a careful analysis of the energy functional restricted to the generalized Nehari manifold, and the existence and fine properties of special Palais–Smale sequences.

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