### Abstract

We exhibit two three-parameter families of locally conformal symplectic forms on the solvmanifold M _{n,k} considered in [1], and show, using the Hodge-de Rham theory for the Lichnerowicz cohomology that that they are not d _{ω} exact, i.e. their Lichnerowicz classes are non-trivial (Theorem 1). This has several important geometric consequences (Corollary 2, 3). This also implies that the group of automorphisms of the corresponding locally conformal symplectic structures behaves much like the group of symplectic diffeomorphisms of compact symplectic manifolds. We initiate the classification of the local conformal symplectic forms in each 3-parameter family (Theorem 2, Corollary 1). We also show that the first (and) third Lichnerowicz cohomology classes are non-zero (Theorem 3). We observe finally that the manifolds M _{n,k} carry several interesting foliations and Poisson structures.

Original language | English (US) |
---|---|

Pages (from-to) | 1-13 |

Number of pages | 13 |

Journal | Journal of Geometry |

Volume | 87 |

Issue number | 1-2 |

DOIs | |

State | Published - Dec 1 2007 |

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### All Science Journal Classification (ASJC) codes

- Geometry and Topology

### Cite this

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_{ω}-exact locally conformal symplectic forms',

*Journal of Geometry*, vol. 87, no. 1-2, pp. 1-13. https://doi.org/10.1007/s00022-006-1849-8

**Examples of non d _{ω}-exact locally conformal symplectic forms.** / Banyaga, Augustin.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Examples of non d ω-exact locally conformal symplectic forms

AU - Banyaga, Augustin

PY - 2007/12/1

Y1 - 2007/12/1

N2 - We exhibit two three-parameter families of locally conformal symplectic forms on the solvmanifold M n,k considered in [1], and show, using the Hodge-de Rham theory for the Lichnerowicz cohomology that that they are not d ω exact, i.e. their Lichnerowicz classes are non-trivial (Theorem 1). This has several important geometric consequences (Corollary 2, 3). This also implies that the group of automorphisms of the corresponding locally conformal symplectic structures behaves much like the group of symplectic diffeomorphisms of compact symplectic manifolds. We initiate the classification of the local conformal symplectic forms in each 3-parameter family (Theorem 2, Corollary 1). We also show that the first (and) third Lichnerowicz cohomology classes are non-zero (Theorem 3). We observe finally that the manifolds M n,k carry several interesting foliations and Poisson structures.

AB - We exhibit two three-parameter families of locally conformal symplectic forms on the solvmanifold M n,k considered in [1], and show, using the Hodge-de Rham theory for the Lichnerowicz cohomology that that they are not d ω exact, i.e. their Lichnerowicz classes are non-trivial (Theorem 1). This has several important geometric consequences (Corollary 2, 3). This also implies that the group of automorphisms of the corresponding locally conformal symplectic structures behaves much like the group of symplectic diffeomorphisms of compact symplectic manifolds. We initiate the classification of the local conformal symplectic forms in each 3-parameter family (Theorem 2, Corollary 1). We also show that the first (and) third Lichnerowicz cohomology classes are non-zero (Theorem 3). We observe finally that the manifolds M n,k carry several interesting foliations and Poisson structures.

UR - http://www.scopus.com/inward/record.url?scp=38849183994&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=38849183994&partnerID=8YFLogxK

U2 - 10.1007/s00022-006-1849-8

DO - 10.1007/s00022-006-1849-8

M3 - Article

VL - 87

SP - 1

EP - 13

JO - Journal of Geometry

JF - Journal of Geometry

SN - 0047-2468

IS - 1-2

ER -