Homological stability and densities of generalized configuration spaces

Ho, Quoc P

doi:10.2140/gt.2021.25.813

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Homological stability and densities of generalized configuration spaces

Quoc P Ho

Geometry & Topology 25 (2021) 813–912

DOI: 10.2140/gt.2021.25.813

Abstract

We prove that the factorization homologies of a scheme with coefficients in truncated polynomial algebras compute the cohomologies of its generalized configuration spaces. Using Koszul duality between commutative algebras and Lie algebras, we obtain new expressions for the cohomologies of the latter. As a consequence, we obtain a uniform and conceptual approach for treating homological stability, homological densities, and arithmetic densities of generalized configuration spaces. Our results categorify, generalize, and in fact provide a conceptual understanding of the coincidences appearing in the work of Farb, Wolfson and Wood (2019). Our computation of the stable homological densities also yields rational homotopy types which answer a question posed by Vakil and Wood in 2015. Our approach hinges on the study of homological stability of cohomological Chevalley complexes, which is of independent interest.

Keywords

generalized configuration spaces, homological stability, homological densities, chiral algebras, chiral homology, factorization algebras, Koszul duality, Ran space

Mathematical Subject Classification 2010

Primary: 81R99

Secondary: 18G55

References

Publication

Received: 11 September 2019

Revised: 3 May 2020

Accepted: 3 May 2020

Published: 27 April 2021

Proposed: Benson Farb

Seconded: Paul Seidel, David M Fisher

Authors

Quoc P Ho
Institute of Science and Technology Austria (IST Austria) Klosterneuburg Austria

Volume 25, issue 2 (2021)