Parametrized spaces model locally constant homotopy sheaves

Details Parametrized spaces model locally constant homotopy sheaves Parametrized spaces model locally constant homotopy sheaves

2007-06-19

arxiv.org/abs/0706.2874v2

Topology Appl. 155 (2008), no. 5, 412--432.

Mathematics

Algebraic Topology

26 pages; exposition improved

Scientific paper

10.1016/j.topol.2007.11.001

We prove that the homotopy theory of parametrized spaces embeds fully and faithfully in the homotopy theory of simplicial presheaves, and that its essential image consists of the locally homotopically constant objects. This gives a homotopy-theoretic version of the classical identification of covering spaces with locally constant sheaves. We also prove a new version of the classical result that spaces parametrized over X are equivalent to spaces with an action of the loop space of X. This gives a homotopy-theoretic version of the correspondence between covering spaces over X and sets with an action of the fundamental group of X. We then use these two equivalences to study base change functors for parametrized spaces.

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