## 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.

### 2014年06月26日(木)

10:00-11:30   数理科学研究科棟(駒場) 122号室

Entropic curvature-dimension condition and Bochner’s inequality (JAPANESE)
[ 講演概要 ]
As a characterization of "lower Ricci curvature bound and upper dimension bound”, there appear several conditions which make sense even on singular spaces. In this talk we show the equivalence in complete generality between two major conditions: a reduced version of curvature-dimension bounds of Sturm-Lott-Villani via entropy and optimal transport and Bakry–¥'Emery's one via Markov generator or the associated heat semigroup. More precisely, it holds for metric measure spaces where Cheeger's L^2-energy functional is a quadratic form. In particular, we establish the full Bochner inequality, which originally comes from the Bochner-Weitzenb¥"ock formula, on such spaces. This talk is based on a joint work with M. Erbar and K.-T. Sturm (Bonn).