幾何コロキウム

過去の記録 ~03/28次回の予定今後の予定 03/29~

開催情報 金曜日 10:00~11:30 数理科学研究科棟(駒場) 126号室
担当者 植田一石,金井雅彦,二木昭人
備考 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
入江慶 氏 (京都大学)
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.