# turkmath.org

Türkiye'deki Matematiksel Etkinlikler

 Yaz Okulu 15 Ağustos 2022 - 27 Ağustos 2022 IMBM - İstanbul Matematiksel Bilimler Merkezi (Online)   Sekizinci Diferansiyel Geometri Yaz okulu kapsamında, İstanbul Matematiksel Bilimler Merkezinde (IMBM) çevrimiçi olarak, 15 - 27 Ağustos 2022 tarihleri arasında, aşağıdaki araştırma dersleri verilecektir.      1. Craig van Coevering - Extremal Kähler metrics and the moment map   2. Alberto Raffero - Closed G_2 structures    3. Ernani Ribeiro Jr. - 4-dimensional gradient Ricci solitons   4. Eyüp Yalçınkaya - Spin(7) Geometry   5. Mustafa Kalafat - Minimal Surfaces   ------------------------------------ Lecturer: Alberto Raffero Title: Lectures on closed G_2 structures Abstract: Two introductory lectures on G2 geometry and two lectures concerning recent developments and open problems on closed G2 structures. ------------------------------------ Lecturer: Ernani Ribeiro Jr. Title: Four-dimensional gradient Ricci solitons Abstract: In this minicourse, we discuss the geometry of four-dimensional gradient shrinking Ricci solitons. Initially, we will show that gradient Ricci solitons are special (self-similar) solutions of the Ricci flow. Moreover, we will present some basic results and examples of gradient shrinking Ricci solitons. In the second part, we will discuss some important results on the classification of four-dimensional gradient shrinking Ricci solitons. To conclude, we will talk about some open problems and their motivations.   ------------------------------------ Lecturer: Eyüp Yalçınkaya Title: Spin(7) Geometry  Abstract: Spin structures have wide applications to mathematical physics, in particular to quantum field theory. In order to study the geometry of the special class Spin(7), there are different approaches. One of them is by holonomy groups. According to the Berger classification (1955), the group Spin(7) is one of the members of the list of holonomy classes. Firstly, we are going to present its properties [1]. After that, we will present normed algebras. Normed algebras are an important concept of this geometry to define metric and measure angle between vectors. Finally, we talk about Calabi-Yau manifolds which play an important role in string theory. Induced from the properties of Calabi-Yau manifolds, we will investigate Mirror Duality on Spin(7) manifolds [2] [3]. References D. Joyce, Lectures on Calabi-Yau and special Lagrangian geometry, Arxiv, (2002). S. Akbulut, S. Salur, Mirror Duality via G 2 and Spin(7) Manifolds, Arithmetic and Geometry Around Quantization, Progress in Mathematics, vol 279, (2010). E. Yalcinkaya, Mirror Duality on Spin(7) manifolds, Preprint. ------------------------------------ Lecturer: Mustafa Kalafat Title: Minimal Surfaces Abstract: A minimal surface is a surface that locally minimizes its area. This is equivalent to having zero mean curvature. They are 2-dimensional analog to geodesics, which are analogously defined as critical points of the length functional. Currently, the theory of minimal surfaces has diversified to minimal submanifolds in other ambient geometries, becoming relevant to mathematical physics (e.g. the positive mass conjecture, the Penrose conjecture) and three-manifold geometry (e.g. the Smith conjecture, the Poincaré conjecture, the Thurston Geometrization Conjecture). In this lecture series, we will give an introduction to some topics in minimal submanifold theory. The topics to be covered are as follows. Mean curvature vector field on a Riemannian submanifold. First variational formula for the volume functional. Second variation of energy for a minimally immersed submanifold. Stability of minimal submanifolds.    We will be using the following resources. References: Li, Peter. Geometric analysis. Cambridge University Press, 2012. ------------------------------------ Lecturer: Craig van Coevering Title: Extremal Kähler metrics and the moment map Abstract: An extremal Kähler metric is a canonical Kähler metric, introduced by E. Calabi, which is somewhat more general than a constant scalar curvature Kähler metric. The existence of such a metric is an ongoing research subject and expected to be equivalent to some form of geometric stability of the underlying polarized complex manifold (M, J, [ω]) –the Yau-Tian-Donaldson conjecture. Thus it is no surprise that there is a moment map, the scalar curvature (A. Fujiki, S. Donaldson), and the problem can be described as an infinite dimensional version of the familiar finite dimensional G.I.T. In this talk I will give an introduction to extremal metrics. Then I will describe how the moment map can be used to describe the local deformation problem of extremal metrics. Essentially, the local picture can be reduced to finite dimensional G.I.T. In particular, we can construct a course moduli space of extremal Kähler metrics with a fixed polarization [ω] ∈ H2(M, R), which is an Hausdorff complex analytic space. ------------------------------------   Dersler ''Online'' olarak gerçekleşecek, güncel araştırma konularında, fakat elementer düzeyde olacak.  NOT: Katılım ücretsiz olup kayıt gereklidir. Dersler Zoom yazılımı üzerinden verilecektir. Geometri, Topoloji Etkinliğin Web Sayfası okelekci@gmail.com, eyupyalcinkaya@gmail.com adgs 24.08.2022

## İLETİŞİM

Akademik biriminizin ya da çalışma grubunuzun ülkemizde gerçekleşen etkinliklerini, ilan etmek istediğiniz burs, ödül, akademik iş imkanlarını veya konuk ettiğiniz matematikçileri basit bir veri girişi ile kolayca turkmath.org sitesinde ücretsiz duyurabilirsiniz. Sisteme giriş yapmak için gerekli bilgileri almak ya da görüş ve önerilerinizi bildirmek için iletişime geçmekten çekinmeyiniz. Katkı verenler listesi için tıklayınız.

Özkan Değer ozkandeger@gmail.com

## DESTEK VERENLER

31. Journees Arithmetiques Konferansı Organizasyon Komitesi

Web sitesinin masraflarının karşılanması ve hizmetine devam edebilmesi için siz de bağış yapmak, sponsor olmak veya reklam vermek için lütfen iletişime geçiniz.