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arXiv 1909.00538math.DSmath.CTmath.DG
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同构向量场上相对平衡点的等变分支

Equivariant Bifurcation from Relative Equilibria via Isomorphic Vector Fields

Stef Klajbor-Goderich

摘要:

我们提出了一个框架来研究等变向量场在相对平衡点附近的动力学。为了克服在相对平衡点上线性化的不足或轨道空间可能的非光滑性,我们对等变向量场空间进行了分类。对象是等变向量场的类别首先由Hepworth在平滑堆栈的上下文中引入[Hepworth,Theory Appl. Categ. 22(2009),542-587]。我们的方法的核心是同构等变向量场的概念。其思想是,考虑等变向量场及其相应的动力学,直到同构是一种考虑群作用的对称性而不传递到轨道空间的方法。特别地,在相对平衡点附近的等变向量场范畴等价于在相对平衡点的切片表示上的等变向量场范畴。在本文中,我们将其应用于分支和相对平衡,并从相对平衡等变分支的条件的通用性。

英文摘要:

We present a framework for studying the dynamics of equivariant vector fields near relative equilibria. To overcome the lack of linearization at a relative equilibrium or the possible non-smoothness of the orbit space, we categorify the space of equivariant vector fields. A category where the objects are equivariant vector fields was first introduced by Hepworth in the context of smooth stacks [Hepworth, Theory Appl. Categ. 22 (2009), 542-587]. Central to our approach is the ensuing notion of isomorphic equivariant vector fields. The idea is that considering equivariant vector fields, and their corresponding dynamics, up to isomorphism is a way to take into account the symmetries of the group action without passing to the orbit space. In particular, the category of equivariant vector fields near a relative equilibrium is equivalent to the category of equivariant vector fields on the slice representation of the relative equilibrium. In this paper we apply this to bifurcations to and from relative equilibria, and to the genericity of conditions for equivariant bifurcation from relative equilibria.

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