Closed geodesics and holonomies for Kleinian manifolds
  For a rank one Lie group G and a Zariski dense and geometrically finite subgroup $\Gamma$ of G, we establish equidistribution of holonomy classes about closed geodesics for the associated locally symmetric space. Our result is given in a quantitative form for real hyperbolic geometrically finite manifolds whose critical exponents are big enough. In the case when G=PSL(2, C), our results can be interpreted as the equidistribution of eigenvalues of $\Gamma$ in the complex plane.   When $\Gamma$ is a lattice, this result was proved by Sarnak and Wakayama in 1999. 
Gregory Margulis, Amir Mohammadi, and Hee Oh
math.DS