Non-arithmetic hyperbolic orbifolds attached to unitary Shimura varieties

Abstract

We develop a new method of constructing non-arithmetic lattices in the projective orthogonal group $\text{PO}(n,1)$ for every integer $n$ larger than one. The technique is to consider anti-holomorphic involutions on a complex arithmetic ball quotient, glue their fixed loci along geodesic subspaces, and show that the resulting metric space carries canonically the structure of a complete real hyperbolic orbifold. The volume of various of these non-arithmetic orbifolds can be explicitly calculated.

73 pages. v4: paper rewritten, main results reformulated

References in corpus (1)

• Stacks of cyclic covers of projective spaces