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An integral model structure and truncation theory for coherent group actions

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Abstract

In this work we study the homotopy theory of coherent group actions from a global point of view, where we allow both the group and the space acted upon to vary. Using the model of Segal group actions and the model categorical Grothendieck construction we construct a model category encompassing all Segal group actions simultaneously. We then prove a global rectification result in this setting. We proceed to develop a general truncation theory for the model-categorical Grothendieck construction and apply it to the case of Segal group actions. We give a simple characterization of n-truncated Segal group actions and show that every Segal group action admits a convergent Postnikov tower built out of its n-truncations.

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Author information

Authors and Affiliations

  1. Département de Mathématiques et Applications, École Normale Supérieure, 45 rue d’Ulm, 75015, Paris, France

    Yonatan Harpaz

  2. Einstein Institute of Mathematics, Edmond J. Safra Campus, The Hebrew University of Jerusalem, Givat Ram, 9190401, Jerusalem, Israel

    Matan Prasma

Authors
  1. Yonatan Harpaz
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  2. Matan Prasma
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Correspondence to Yonatan Harpaz.

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Harpaz, Y., Prasma, M. An integral model structure and truncation theory for coherent group actions. Isr. J. Math. 221, 511–561 (2017). https://doi.org/10.1007/s11856-017-1551-6

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  • DOI: https://doi.org/10.1007/s11856-017-1551-6

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