Speaker: Prof. CHEN Yifei, Associate Research Fellow, Academy of Mathematics and Systems Science, Chinese Academy of SciencesVenue: Lecture Hall, Institute of Advanced Mathematics, No.7 East Teaching Building, Zijingang CampusAbstract:Singularities play an important role in the Minimal Model Program (MMP), which aims to birationally classify algebraic varieties. In this talk, I will introduce main conjectures of singularities in MMP, as well as some recent progress in the direction, including a joint work with Caucher Birkar for Shokurov's Conjecture.

Speaker: Dr. XU Qing, Financial Policy Expert of Sustainable Development Goals, United Nations Development Agency in ChinaScan the QR code to join the online meeting on Dingtalk.

Speaker: Prof. WU Hao, YAU Mathematical Sciences Center, Tsinghua UniversityVenue: Room 200-9, Run Run Shaw Business Administration Building, Yuquan CampusAbstract:Two-dimensional Gaussian free field (GFF) is a natural 2D time analogue of Brownian motion. It is also known as free bosonic field in physics literatures, and it is the building block in conformal field theory, quantum gravity and statistical physics. In this talk, we focus on estimates of crossing probability in GFF. Such crossing probability is a delicate quantity for GFF. We will introduce discrete GFF (dGFF) and metric graph GFF (mGFF). Both objects converge to continuum GFF as distributions. However, the crossing probabilities in dGFF and in mGFF are distinct. To derive the scaling limits of crossing probabilities in dGFF and in mGFF, we will introduce Schramm Loewner evolution (SLE). It turns out that the crossing probability in dGFF converges to the so-called pure partition functions of multiple SLEs, and that the crossing probability in mGFF converges to the "fusion" of pure partition functions.  This talk is based on joint works with J. Ding (UPenn), M. Wirth (UPenn), and with M. Liu (Tsinghua).  Contact Person: Su Zhonggen（suzhonggen@zju.edu.cn, Tel：0571-87953676）

Theme: Changes in Time Use and Experienced HappinessSpeaker: Jeehoon Han, assistant professor, School of Economics, Zhejiang UniversityVenue: Room 121 Lecture Hall, School of Economics, Zijingang Campus

Speaker: SHI Yuguang, professor, School of Mathematical ScienPeking UniversityOnline Seminar: Room 200-9, Run Run Shaw Business Administration Building, Yuquan Campus In this talk, we will prove positive mass theorems for ALF and ALG manifolds with model spaces $R^{n-1}\times S^1$ and $R^{n-2}\times T^2$ respectively in dimensions no greater than 7. Different from the compatibility condition for spin structure in Theorem 2 of V. Minerbe’s paper A mass for ALF manifolds, Comm. Math. Phys. 289 (2009), no. 3, 925–955 we show that some type of incompressible condition for $S^1$ and $T^2$ is enough to guarantee the nonnegativity of the mass. As in the asymptotically flat case, we reduce the desired positive mass theorems to those ones concerning non-existence of positive scalar curvature metrics on closed manifolds coming from generalize surgery to -torus. Finally, we investigate certain fill-in problems and obtain an optimal bound for total mean curvature of admissible fill-ins for flat product 2-torus $S^1(l_1)\times S^1(l_2)$. This talk is based on the paper joint with my Ph.D. students Peng Liu and Jintian Zhu, here is the link of the paper :http://arxiv.org/abs/2103.11289.  Contact Person: Sheng Weimin（shengweimin@zju.edu.cn）

Speaker：LI Wei, associate professor, College of Business, Shanghai University of Finance and Economics Venue：Room 530, School of Economics, Zijingang CampusAbstract：We study the consumption-portfolio decision of a household with limited information-processing ca-pacity (rational inattention) in a two-country equilibrium model under recursive utility. Our rationally inattentive household reacts gradually to asset return innovations and naturally concerns about long-run consumption risk, which implies less volatile and less cross-country correlated stochastic discount factors. Despite the high correlation of international stock markets, we are able to generate 1) relative consumption growth and real exchange rate depreciations has a correlation close to zero or negative (Backus-Smith puzzle); 2)fluctuations in exchange rate is not so volatile; 3)consumption is less volatile than real exchange rate.

Speaker: WANG Xianhua, Professor of Shanghai International Studies University，Director of Institute for Global History of Civilization, Shanghai International Studies UniversityVenue: Room 429, School of Humanities, Zijingang Campus

Speaker: Malcolm Forster, Distinguished Professor, Fudan UniversitySpeaker: Malcolm Forster, Distinguished Professor, Fudan University, Shanghai, Chinahttp://philosophy.fudan.edu.cn/03/a4/c14253a263076/page.htmVenue: Room 513, School of Humanities, Zijingang Campus

Speaker: ZHANG Hong, investigator, Institute of Biophysics, Chinese Academy of SciencesVenue: Room 205, Administrative Building, School of Medicine, Zijingang Campus