{"title":"$$G_2$$ -orbifolds 分辨率上的 $$G_2$$ -定子","authors":"Daniel Platt","doi":"10.1007/s00220-024-04947-2","DOIUrl":null,"url":null,"abstract":"<p>We explain a construction of <span>\\(G_2\\)</span>-instantons on manifolds obtained by resolving <span>\\(G_2\\)</span>-orbifolds. This includes the case of <span>\\(G_2\\)</span>-instantons on resolutions of <span>\\(T^7/\\Gamma \\)</span> as a special case. The ingredients needed are a <span>\\(G_2\\)</span>-instanton on the orbifold and a Fueter section over the singular set of the orbifold which are used in a gluing construction. In the general case, we make the very restrictive assumption that the Fueter section is pointwise rigid. In the special case of resolutions of <span>\\(T^7/\\Gamma \\)</span>, improved control over the torsion-free <span>\\(G_2\\)</span>-structure allows to remove this assumption. As an application, we construct a large number of <span>\\(G_2\\)</span>-instantons on the simplest example of a resolution of <span>\\(T^7/\\Gamma \\)</span>. We also construct one new example of a <span>\\(G_2\\)</span>-instanton on the resolution of <span>\\((T^3 \\times \\text {K3})/\\mathbb {Z}^2_2\\)</span>.</p>","PeriodicalId":522,"journal":{"name":"Communications in Mathematical Physics","volume":null,"pages":null},"PeriodicalIF":2.2000,"publicationDate":"2024-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"$$G_2$$ -instantons on Resolutions of $$G_2$$ -orbifolds\",\"authors\":\"Daniel Platt\",\"doi\":\"10.1007/s00220-024-04947-2\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>We explain a construction of <span>\\\\(G_2\\\\)</span>-instantons on manifolds obtained by resolving <span>\\\\(G_2\\\\)</span>-orbifolds. This includes the case of <span>\\\\(G_2\\\\)</span>-instantons on resolutions of <span>\\\\(T^7/\\\\Gamma \\\\)</span> as a special case. The ingredients needed are a <span>\\\\(G_2\\\\)</span>-instanton on the orbifold and a Fueter section over the singular set of the orbifold which are used in a gluing construction. In the general case, we make the very restrictive assumption that the Fueter section is pointwise rigid. In the special case of resolutions of <span>\\\\(T^7/\\\\Gamma \\\\)</span>, improved control over the torsion-free <span>\\\\(G_2\\\\)</span>-structure allows to remove this assumption. As an application, we construct a large number of <span>\\\\(G_2\\\\)</span>-instantons on the simplest example of a resolution of <span>\\\\(T^7/\\\\Gamma \\\\)</span>. We also construct one new example of a <span>\\\\(G_2\\\\)</span>-instanton on the resolution of <span>\\\\((T^3 \\\\times \\\\text {K3})/\\\\mathbb {Z}^2_2\\\\)</span>.</p>\",\"PeriodicalId\":522,\"journal\":{\"name\":\"Communications in Mathematical Physics\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.2000,\"publicationDate\":\"2024-03-13\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Communications in Mathematical Physics\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://doi.org/10.1007/s00220-024-04947-2\",\"RegionNum\":1,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"PHYSICS, MATHEMATICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Communications in Mathematical Physics","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1007/s00220-024-04947-2","RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"PHYSICS, MATHEMATICAL","Score":null,"Total":0}
$$G_2$$ -instantons on Resolutions of $$G_2$$ -orbifolds
We explain a construction of \(G_2\)-instantons on manifolds obtained by resolving \(G_2\)-orbifolds. This includes the case of \(G_2\)-instantons on resolutions of \(T^7/\Gamma \) as a special case. The ingredients needed are a \(G_2\)-instanton on the orbifold and a Fueter section over the singular set of the orbifold which are used in a gluing construction. In the general case, we make the very restrictive assumption that the Fueter section is pointwise rigid. In the special case of resolutions of \(T^7/\Gamma \), improved control over the torsion-free \(G_2\)-structure allows to remove this assumption. As an application, we construct a large number of \(G_2\)-instantons on the simplest example of a resolution of \(T^7/\Gamma \). We also construct one new example of a \(G_2\)-instanton on the resolution of \((T^3 \times \text {K3})/\mathbb {Z}^2_2\).
期刊介绍:
The mission of Communications in Mathematical Physics is to offer a high forum for works which are motivated by the vision and the challenges of modern physics and which at the same time meet the highest mathematical standards.