Quantitative spectral gap for thin groups of hyperbolic isometries
(2015)
Journal Article
Magee, M. (2015). Quantitative spectral gap for thin groups of hyperbolic isometries. Journal of the European Mathematical Society, 17(1), 151-187. https://doi.org/10.4171/jems/500
Let ΛΛ be a subgroup of an arithmetic lattice in SO(n+1,1)SO(n+1,1). The quotient Hn+1/ΛHn+1/Λ has a natural family of congruence covers corresponding to ideals in a ring of integers. We establish a super-strong approximation result for Zariski-dense... Read More about Quantitative spectral gap for thin groups of hyperbolic isometries.