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Goodwillie Approximations to Higher Categories

About this Title

Gijs Heuts

Publication: Memoirs of the American Mathematical Society
Publication Year: 2021; Volume 272, Number 1333
ISBNs: 978-1-4704-4893-6 (print); 978-1-4704-6749-4 (online)
DOI: https://doi.org/10.1090/memo/1333
Published electronically: September 21, 2021
Keywords: Goodwillie calculus, infinity-categories, infinity-operads, Tate cohomology, rational homotopy theory

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Table of Contents

Chapters

  • Introduction
  • 1. Main results
  • 2. Constructing $n$-excisive approximations
  • 3. Another construction of polynomial approximations
  • 4. Coalgebras in stable $\infty$-operads
  • 5. The space of Goodwillie towers
  • 6. Examples
  • A. Compactly generated $\infty$-categories
  • B. Some facts from Goodwillie calculus
  • C. Truncations

Abstract

We construct a Goodwillie tower of categories which interpolates between the category of pointed spaces and the category of spectra. This tower of categories refines the Goodwillie tower of the identity functor in a precise sense. More generally, we construct such a tower for a large class of $\infty$-categories $\mathcal {C}$ and classify such Goodwillie towers in terms of the derivatives of the identity functor of $\mathcal {C}$. As a particular application we show how this provides a model for the homotopy theory of simply-connected spaces in terms of coalgebras in spectra with Tate diagonals. Our classification of Goodwillie towers simplifies considerably in settings where the Tate cohomology of the symmetric groups vanishes. As an example we apply our methods to rational homotopy theory. Another application identifies the homotopy theory of $p$-local spaces with homotopy groups in a certain finite range with the homotopy theory of certain algebras over Ching’s spectral version of the Lie operad. This is a close analogue of Quillen’s results on rational homotopy.

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