## 幾何コロキウム

開催情報 金曜日　10:00～11:30　数理科学研究科棟(駒場) 126号室 植田一石，金井雅彦，二木昭人 開始時間と開催場所などは変更されることがあるので, セミナーごとにご確認ください.

### 2012年10月31日(水)

10:30-12:00   数理科学研究科棟(駒場) 128号室

Hofer-Zehnder capacity and a Hamiltonian circle action with noncontractible orbits (JAPANESE)
[ 講演概要 ]
Hofer-Zehnder (HZ) capacity is an invariant of symplectic manifolds, which is important in symplectic topology and Hamiltonian dynamics. The energy-capacity inequality (due to Hofer and many others) claims that HZ capacity of a domain is bounded from above by its dispalcement energy.
In this talk, we prove a variant of this inequality, which is applicable to nondisplaceable domains. We also give some applications, including case of disc cotangent bundles.