The Hyperbolic Lattice Point Count in Infinite Volume with Applications to Sieves

TL;DR

This paper develops new operator-theoretic techniques to asymptotically count lattice points in infinite-volume hyperbolic manifolds and applies these results to prime number problems in orbits of certain groups, achieving bounds similar to classical sieve results.

Contribution

It introduces novel methods for lattice counting in infinite-volume hyperbolic spaces and applies them to affine linear sieves, providing explicit bounds on prime factors in orbits.

Findings

Asymptotic formulas with uniform error terms for lattice counts

Infinitely many integers with bounded prime factors in specific orbits

Bounds on prime factors comparable to Brun's twin prime approach

Abstract

We develop novel techniques using abstract operator theory to obtain asymptotic formulae for lattice counting problems on infinite-volume hyperbolic manifolds, with error terms which are uniform as the lattice moves through "congruence" subgroups. We give the following application to the theory of affine linear sieves. In the spirit of Fermat, consider the problem of primes in the sum of two squares, f(c,d)=c^2+d^2, but restrict (c,d) to the orbit O = (0,1).Gamma, where Gamma is an infinite-index non-elementary finitely-generated subgroup of SL(2,Z). Assume that the Reimann surface Gamma\H^2 has a cusp at infinity. We show that the set of values f(O) contains infinitely many integers having at most R prime factors for any R>4/(delta-theta), where theta>1/2 is the spectral gap and delta<1 is the Hausdorff dimension of the limit set of Gamma. If delta>149/150, then we can take theta=5/6, giving R=25. The limit of this method is R=9 for delta-theta>4/9. This is the same number of prime factors as attained in Brun's original attack on the twin prime conjecture.