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arXiv 0712.1391math.NTmath.SP
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无限体上双曲格点计数及其在筛上的应用

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

Alex V. Kontorovich

摘要:

我们开发了新的技术,使用抽象算子理论,以获得渐近公式的晶格计数问题的无限体积双曲流形,误差项是统一的晶格移动通过“同余”子群。我们给出仿射线性筛理论的下列应用。根据费马的思想,考虑两个平方和中的素数问题,f(c,d)=c^2+d^2,但将(c,d)限制在轨道O =(0,1).Gamma,其中Gamma是SL(2,Z)的无限指数非初等有限生成子群。假设Reimann曲面Gamma \H^2在无穷远处有一个尖点。我们证明了f(O)的值集包含无穷多个整数,对于任意R&gt;4/(delta-theta),至多有R个素因子,其中theta&gt;1/2是谱隙,delta为<1 is the Hausdorff dimension of the limit set of Gamma. If delta>149/150,那么我们可以取theta=5/6,给出R=25。对于delta-theta&gt;4/9,该方法的极限为R=9。这是相同数量的素因子达到布伦的原始攻击的孪生素数猜想。

英文摘要:

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.

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