流形上栈的微分几何粗模空间
微分几何
2023-03-08 v5 代数拓扑
摘要
本文将微分空间视为光滑流形位点上的栈,并考察任意栈的“底层”微分空间。更确切地说,我们将微分空间视为所谓的具体层,并证明将这些层映射为栈的 Grothendieck 构造具有左伴随函子:即将任意栈映射为其微分几何粗模空间(diffeological coarse moduli space)的函子。作为应用,我们将注意力局限于微分栈,并借助 Lie 群胚及其主丛考察粗模空间构造背后的几何结构。在此背景下,我们定义了“格布”(gerbe),并阐明了 Lie 群胚在何种条件下构成此类格布(或栈在何时由其一表示)。此外,我们为栈定义了基本微分形式,并在微分情形下确认这些形式(在特定条件下)与代表性 Lie 群胚上的基本微分形式一致。这些基本微分形式进而与轨道空间上的微分形式相匹配。
引用
@article{arxiv.1406.1392,
title = {Diffeological Coarse Moduli Spaces of Stacks over Manifolds},
author = {Jordan Watts and Seth Wolbert},
journal= {arXiv preprint arXiv:1406.1392},
year = {2023}
}
备注
19 pages; v5: added an application on gerbes (to appear in AMS Contemporary Mathematics). v4: besides some minor changes, the abstract was rewritten and we added an application to the differentiable stack section. v3: condensed the presentation and added more information to the introduction. (Also changed the title.)