P. Caldiroli et M. Nolasco, MULTIPLE HOMOCLINIC SOLUTIONS FOR A CLASS OF AUTONOMOUS SINGULAR SYSTEMS IN R-2, Annales de l Institut Henri Poincare. Analyse non lineaire, 15(1), 1998, pp. 113-125
We look for homoclinic solutions for a class of second order autonomou
s Hamiltonian systems in R-2 with a potential V having a strict global
maximum at the origin and a finite set S subset of R-2 of singulariti
es, namely V(x) --> -infinity as dist(x,S) --> 0. We prove that if V s
atisfies a suitable geometrical property then for any k epsilon N the
system admits a homoclinic orbit turning k times around a singularity
xi epsilon S. (C) Elsevier, Paris.