Connections and $L_{\infty}$ liftings of semiregularity maps

Abstract: Let $E^*$ be a finite complex of locally free sheaves on a complex manifold $X$. We prove that to every connection of type $(1,0)$ on $E^*$ it is canonically associated an $L_{\infty}$ morphism $g\colon A^{0, }_X(\mathcal{H}om^_{O_X}(E^,E^))\to \dfrac{A^{,}_X}{A^{\ge 2,*}_X}[2]$ that lifts the 1-component of Buchweitz-Flenner semiregularity map. An application to deformations of coherent sheaves on projective manifolds is given.