Lubotzky–Sarnak conjecture on property tau for hyperbolic 3-manifold groups

Let $M$ be a hyperbolic $3$-manifold, and let $\pi_1(M)$ be its fundamental group. Lubotzky–Sarnak conjecture. The group $\pi_1(M)$ does not have property $(\tau)$. This is presented as a weaker conjecture related to the virtually positive Betti number conjecture. The source does not state a resolution.