Contents Online
Homology, Homotopy and Applications
Volume 25 (2023)
Number 2
The structuring effect of a Gottlieb element on the Sullivan model of a space
Pages: 275 – 296
DOI: https://dx.doi.org/10.4310/HHA.2023.v25.n2.a12
Authors
Abstract
We show a Gottlieb element in the rational homotopy of a simply connected space $X$ implies a structural result for the Sullivan minimal model, with different results depending on parity. In the even-degree case, we prove a rational Gottlieb element is a terminal homotopy element. This fact allows us to complete an argument of Dupont to prove an even-degree Gottlieb element gives a free factor in the rational cohomology of a formal space of finite type. We apply the odd-degree result to affirm a special case of the $2N$-conjecture on Gottlieb elements of a finite complex. We combine our results to make a contribution to the realization problem for the classifying space $\operatorname{\mathit{B}aut}_1 (X)$. We prove a simply connected space $X$ satisfying $\operatorname{\mathit{B}aut}_1 (X_\mathbb{Q}) \simeq S^{2n}_\mathbb{Q}$ must have infinite-dimensional rational homotopy and vanishing rational Gottlieb elements above degree $2n-1$ for $n=1,2,3$.
Keywords
Gottlieb element, Sullivan minimal model, classifying space for a fibration, derivation
2010 Mathematics Subject Classification
Primary 55P62, 55R35. Secondary 55R15.
Received 5 January 2022
Received revised 29 June 2022
Accepted 29 September 2022
Published 1 November 2023