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SIMIS Seminar on Field Theory and String Theory: Orientifold Calabi-Yau threefolds: divisor exchanges and reflections

Speaker: Xin Gao (Sichuan University) Abstract: We systematically constructed orientifold Calabi-Yau threefolds, encompassing both divisor exchange and multiple divisor reflection involutions. Expanding our classification, we reached h^{1,1}(X)=12 using a database from the Kreuzer-Skarke list. We identified 156,509 proper divisor exchange involutions, and explored over 1 billion reflection types. Under these involutions, we clarified some ambiguities …

SIMIS Seminar on Field Theory and String Theory: Orientifold Calabi-Yau threefolds: divisor exchanges and reflections 查看全文 »

SIMIS Seminar on Field Theory and String Theory: Bootstrapping the Abelian Lattice Gauge Theories

Speaker: Zhijin Li (Southeast University) Abstract: In this talk, I will introduce a recent bootstrap study of the Z2 and U(1) Abelian lattice gauge theories, for which the loop equations and positivity conditions are employed for Wilson loops with lengths L ⩽ Lmax to derive two-sided bounds on the Wilson loop averages. I will address …

SIMIS Seminar on Field Theory and String Theory: Bootstrapping the Abelian Lattice Gauge Theories 查看全文 »

SIMIS Seminar on Field Theory and String Theory: A loop group valued Frobenius period map for a mod $p$ Shimura variety

Speaker: Qijun Yan (BIMSA) Abstract: In this talk, I will describe a variant of the zip period map of the special fibre of a Shimura variety (of good reduction) which defines the Ekedahl-Oort strata of S. The target of the period map is the moduli stack of 1-1 truncated local Shtukas. If time permits, I …

SIMIS Seminar on Field Theory and String Theory: A loop group valued Frobenius period map for a mod $p$ Shimura variety 查看全文 »

SIMIS Seminar on Field Theory and String Theory: Partial entanglement network and geometry reconstruction in AdS/CFT

Speaker: Qiang Wen (YAUC, Southeast University) Abstract: We give a scheme to geometrize the partial entanglement entropy (PEE) in AdS/CFT on a time slice in generic dimensions. More explicitly, the two point PEE is represented by bulk geodesics, which we call the PEE threads. The density of the PEE threads is determined by the physical …

SIMIS Seminar on Field Theory and String Theory: Partial entanglement network and geometry reconstruction in AdS/CFT 查看全文 »

2024年全国优秀大学生夏令营活动通知

复旦大学-上海数学与交叉学科研究院2024年全国优秀大学生夏令营活动通知 一、2024年夏令营活动简介         上海数学与交叉学科研究院(以下简称“研究院”)是由上海市、 杨浦区和复旦大学共同支持的新型研发机构,位于上海市杨浦区。研究院立足上海、辐射长三角,力争搭建集高水平基础研究、人才集聚与培养为一体的国际领先基础科学与交叉研究平台,重点面向基础数学、应用纯数学及人工智能与生物医药的交叉学科应用等领域,攻克重大科学难题和现实挑战,支撑国家重大战略需求,为解决国家当前 面临的卡脖子问题提供理论基础,引领原创性技术发展。 经协商,研究院依托复旦大学,双方共同实施联合培养博士研究生项目,积极探索推进具有中国特色并与国际接轨的博士生教育机制, 培养优秀创新人才。联合培养博士生的学籍属于复旦大学,学生完成培养方案规定的学习要求、通过论文答辩,由复旦大学颁发学历证书; 达到学位申请要求者向复旦大学申请学位。         研究院目前有 8 个研究团队: 1.基础数学:(1)丘成桐院士领衔的微分几何团队、(2)李骏院士领衔的代数几何团队、(3)连文豪教授领衔的弦论团队、(4)胡森教授领衔的数学物理团队; 2.应用数学:(1)张俊教授领衔的信息几何和认知计算团队、(2) 林文伟教授领衔的数值代数和计算几何团队; 3.交叉学科:(1)李明教授领衔的人工智能团队、(2)邬荣领教 授领衔的计算生物学和计算医学团队。联合培养博士生项目以招收直接攻博士生为主,2024年6月下旬举办夏令营,对申请人进行预选拔。如果通过夏令营选拔的优秀生源充足,本年度原则上将不再举行其他推免生预选拔、选拔活动。若有相关活动,届时将另行通知,请及时关注本单位官方网站信息。 二、报名时间         即日起-5月31日17:00。 三、报名条件 四、报名材料 五、报名方式         1. 网上报名         登录复旦大学研究生招生网(https://gsao.fudan.edu.cn),通过“研究生报考服务系统”中的“全国优秀大学生夏令营”进行网上报名。选择“402 上海数学与交叉学科研究院”进行网上报名。         2. 纸质材料寄送说明         本院无需考生寄送纸质材料。 六、计划营员人数         计划营员人数约100名。实际入营人数将根据报名情况适当调整。 七、营员遴选结果通知         营员遴选结果将通过复旦大学研究生报考服务系统发布,请考生及时登录系统查看。暂定6月10日左右在本单位网站公布入营名单。 八、夏令营活动安排         暂定安排如下,以最终通知为准: 九、优秀营员评选实施细则 十、咨询方式和监督申诉渠道         咨询方式:学生办公室,联系电话:021-65660296,邮箱:jiatingli@simis.cn         本《活动通知》自公布之日起实施,未列事项参照学校相关规定执行,由上海数学与交叉学科研究负责解释。 上海数学与交叉学科研究院2024年5月

SIMIS Seminar on Geometric Analysis and PDEs: Some long time existence and convergence results on hypersymplectic flow

Speaker: Yao Chengjian (ShanghaiTech University) Abstract: Hypersymplectic structure on a 4-manifold is a triple of symplectic forms such that any nontrivial linear combination of them is symplectic. The hypersymplectic flow is a natural geometric flow designed with the goal of deforming one given hypersymplectic structure in its cohomology class to a hyperKahler structure. This flow also has close relation with …

SIMIS Seminar on Geometric Analysis and PDEs: Some long time existence and convergence results on hypersymplectic flow 查看全文 »

SIMIS Seminar on Geometric Analysis and PDEs: Free boundaries in optimal transportation

Speaker: Shibing Chen (University of Science and Technology of China) Abstract: In this talk, I will discuss the optimal partial transport problem, in which free boundaries arise. The problem was first investigated by Caffarelli and McCann [Annals 2010], where they established the interior C^{1,\alpha} regularity of the free boundary but left open the higher-order regularity …

SIMIS Seminar on Geometric Analysis and PDEs: Free boundaries in optimal transportation 查看全文 »

代数几何中的正性理论和应用

报告人:张磊(中国科学技术大学) 摘要:我们将首先讨论代数几何中的一些正性的概念,从分析和代数两个角度,然后介绍典范层的正向层的一些正性结论以及证明思想,然后介绍这些结论在代数簇分类中的一些应用。 时间: 2024-05-11, 周六 15:00 地点: 上海市杨浦区伟成路62号创智天地企业中心3号楼6层 Zoom Meeting No.: 423 317 8953Password: SIMIS 组织者: 胡森

Locally constrained inverse curvature flows and applications

Speaker:韦勇(中国科学技术大学) Abstract:The locally constrained inverse curvature flow in space forms was introduced by Brendle, Guan and Li and is a powerful tool to prove the Alexandrov-Fenchel inequalities. In the first part of the talk, we show that h-convexity is preserved by Brendle-Guan-Li’s flow in hyperbolic space and as applications we prove some optimal geometric inequalities …

Locally constrained inverse curvature flows and applications 查看全文 »

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