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arXiv 2102.06146math.CTmath.AT
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有效模型结构与$\infty$ -广群对象

The effective model structure and $\infty$-groupoid objects

Nicola Gambino, Simon Henry, Christian Sattler, Karol Szumiło

摘要:

对于一类具有有限极限和良好可数余积的范畴$\mathcal E$,我们在$\mathcal E$中的单纯对象范畴上构造了一个模型结构,称为有效模型结构,推广了单纯集上的Kan-Quillen模型结构.然后,我们证明了有效的模型结构是左和右适当的,并满足下降的意义下的Rezk。由此,我们得到当$\mathcal E$是但不是一般的高阶拓扑时,相应的$\infty$ -范畴有有限极限,余极限满足下降,并且是局部笛卡尔闭的.我们还证明了由有效模型结构提出的$\infty$ -范畴,表明它是$\mathcal E$上由$\mathcal E$中的Kan复体所跨越的预层的完整子范畴,这一结果与精确完备化理论有密切的相似性。

英文摘要:

For a category $\mathcal E$ with finite limits and well-behaved countable coproducts, we construct a model structure, called the effective model structure, on the category of simplicial objects in $\mathcal E$, generalising the Kan--Quillen model structure on simplicial sets. We then prove that the effective model structure is left and right proper and satisfies descent in the sense of Rezk. As a consequence, we obtain that the associated $\infty$-category has finite limits, colimits satisfying descent, and is locally Cartesian closed when $\mathcal E$ is, but is not a higher topos in general. We also characterise the $\infty$-category presented by the effective model structure, showing that it is the full sub-category of presheaves on $\mathcal E$ spanned by Kan complexes in $\mathcal E$, a result that suggests a close analogy with the theory of exact completions.

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