Erd\H{o}s-Kac type theorem for the number of scattering geodesics on modular surface

Abstract

In 1917, Hardy and Ramanujan showed that if $\omega(n)$ is the number of distinct prime factors of a randomly chosen positive integer $n,$ then the normal order of $\omega(n)$ is $\log \log \, n.$ This led Erd\H{o}s and Kac to prove their celebrated result showing a Gaussian behaviour for $\omega(n).$ In this article we prove an Erd\H{o}s-Kac kind result for the number of scattering geodesics on the modular surface with a common sojourn time.