Free-field approaches to boundary $\mathcal{W} \big[ \widehat{g} \big] (p,p') $ minimal models

Abstract: We apply the background charged bosonic free-field approach to the rational principal quantum Drinfeld-Sokolov (QDS) $\mathcal{W} \big<a href="p,p&#39;" title="" rel="nofollow" data-turbo="false" class="assistant-link"> \widehat{g} \big</a>$ minimal models with boundaries, where $g$ is a simple bosonic Lie algebra. We express their Ishibashi states using the free-field Ishibashi states, and calculate disk two-point correlation functions using the free-field vertex operators with intertwiner insertions. The integral results are obtained by repeatedly applying the Euler-type integral expression and the Taylor expansions of Lauricella's hypergeometric functions $F_{D}<sup>{(n)}$. We also discuss the QDS $\mathcal{W}$ algebras related to a semi-simple Lie algebra $g$, and apply a coset free-field resolution to express diagonal ADE coset $\mathcal{W}$ minimal Ishibashi states.