Bounded $\mathbf{H_\infty}$-Calculus for Differential Operators on Conic   Manifolds with Boundary
  We derive conditions that ensure the existence of a bounded $H_\infty$-calculus in weighted $L_p$-Sobolev spaces for closed extensions $\underline{A}_T$ of a differential operator $A$ on a conic manifold with boundary, subject to differential boundary conditions $T$. In general, these conditions ask for a particular pseudodifferential structure of the resolvent $(\lambda-\underline{A}_T)^{-1}$ in a sector $\Lambda\subset\mathbf{C}$. In case of the minimal extension they reduce to parameter-ellipticity of the boundary value problem $(A,T)$. Examples concern the Dirichlet and Neumann Laplacians. 
S. Coriasco, E. Schrohe, J. Seiler