The solution on the geography-problem of non-formal compact (almost) contact manifolds

Abstract

Let $(m,b)$ be a pair of natural numbers. For $m$ odd with $m \ge 7$ (resp. $m \ge 5$) and $b=1$ (resp. $b=0$) we show that there is a non-formal compact (almost) contact $m$-manifold with first Betti number $b_1 = b$. Moreover, in the case $b = 0$ with $m \ge 7$, the manifold even is simply-connected.