Abstract
Let M be a weakly monotone symplectic manifold and H be a time-dependent 1-periodic Hamiltonian; we assume that the 1-periodic orbits of the corresponding time-dependent Hamiltonian vector field are non-degenerate. We construct a refined version of the Floer chain complex associated to these data and any regular covering of M and derive from it new lower bounds for the number of 1-periodic orbits. Using these invariants we prove in particular that if π 1(M) is finite and solvable or simple, then the number of 1-periodic orbits is not less than the minimal number of generators of π 1(M). For a general closed symplectic manifold with infinite fundamental group, we show the existence of 1-periodic orbit of Conley–Zehnder index 1 − n for any non-degenerate 1-periodic Hamiltonian system.
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Notes
- 1.
- 2.
There is an approach to construct Hamiltonian Floer complex with integer coefficients for non-degenerate periodic Hamiltonian systems on arbitrary closed symplectic manifold [9]. Since the details have not been carried out, we restrict ourselves to the class of weakly monotone symplectic manifolds.
- 3.
In [17], [ω] is a rational cohomology class, i.e., an integral cohomology class after multiplying a suitable integer. Any symplectic form is approximated by rational symplectic forms and the estimate for the number of fixed points of a non-degenerate Hamiltonian diffeomorphism is reduced to the one on a closed symplectic manifolds with rational symplectic class.
- 4.
The symbol \(\lceil z\rceil \) denotes the minimal integer k ≥ z.
- 5.
Our terminology here differs from that of Swan’s paper [23].
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Acknowledgements
The authors started this work during the visit of the second author to RIMS, Kyoto University, in May 2013, and continued it during the visit of the first author to the Nantes University in November 2013. It was finalized during the visit of the second author to the Kavli IPMU, the University of Tokyo, in April 2014.
The first author thanks Laboratoire Jean Leray, Université de Nantes, for the financial support and its hospitality. He is partly supported by JSPS Grant-in-Aid for Scientific Research # 21244002 and # 26247006. The second author gratefully acknowledges the support of RIMS, Kyoto University, the Program for Leading Graduate Schools, MEXT, Japan, and of the Kavli IPMU, the University of Tokyo, and thanks RIMS, Kyoto University, and the Kavli IMPU for their hospitality. The second author thanks A. Lucchini for sending the papers [15, 16].
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Ono, K., Pajitnov, A. (2016). On the Fixed Points of a Hamiltonian Diffeomorphism in Presence of Fundamental Group. In: Rassias, T., Pardalos, P. (eds) Essays in Mathematics and its Applications. Springer, Cham. https://doi.org/10.1007/978-3-319-31338-2_10
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