%0 Journal Article %T $A_\infty$-actions and Recognition of Relative Loop Spaces %A Eduardo Hoefel %A Muriel Livernet %A Jim Stasheff %J Mathematics %D 2013 %I arXiv %X We show that relative loop spaces are recognized by $A_\infty$-actions. A certain version of the 2-sided bar construction is used to prove such recognition theorem. The operad ${\sf Act}_\infty$ of $A_\infty$-actions is presented in terms of the Boardman-Vogt resolution of the operad ${\sf Act}$. We exhibit an operad homotopy equivalence between such resolution and the $1$-dimensional Swiss-cheese operad $\mathcal{SC}_1$. %U http://arxiv.org/abs/1312.7155v1