Vanishing of Symplectic Homology and Obstruction to Flexible Fillability

For any asymptotically dynamically convex contact manifold $Y$, we show that $S{H}_{\ast }(W)=0$ is a property independent of the choice of topologically simple (i.e.\ $c_1(W)=0$ and ${\pi }_1(Y)\to {\pi }_1(W)$ is injective) Liouville filling $W$. In particular, if $Y$ is the boundary of a flexible Weinstein domain, then any topologically simple Liouville filling $W$ has vanishing symplectic homology. As a consequence, we answer a question of Lazarev partially: a contact manifold $Y$ admitting flexible fillings determines the integral cohomology of all the topologically simple Liouville fillings of $Y$. The vanishing result provides an obstruction to flexible fillability. As an application, we show that all Brieskorn manifolds of dimension $\ge 5$ cannot be filled by flexible Weinstein manifolds.