Simplicial resolutions and Ganea fibrations

Abstract

In this work, we compare the two approximations of a path-connected space $X$, by the Ganea spaces $G_n(X)$ and by the realizations $\Vert {\Lambda }_{\bullet }X{\Vert }_n$ of the truncated simplicial resolutions emerging from the loop-suspension cotriple $\Sigma \Omega$. For a simply connected space $X$, we construct maps $\Vert {\Lambda }_{\bullet }X{\Vert }_{n-1}\to G_n(X)\to \Vert {\Lambda }_{\bullet }X{\Vert }_n$ over $X$, up to homotopy. In the case $n=2$, we prove the existence of a map $G_2(X)\to \Vert {\Lambda }_{\bullet }X{\Vert }_1$ over $X$ (up to homotopy) and conjecture that this map exists for any $n$.