Arithmetic statistics of families of integer Sn-polynomials and application to class group torsion

Abstract: We study the distributions of the splitting primes in certain families of number fields. The first and main example is the family Pn,N of integer polynomials monic of degree n with height less or equal then N, and then let N go to infinity. We prove an average version of the Chebotarev Density Theorem for this family. In particular, this gives Central Limit Theorem for the number of primes with given splitting type in some ranges. As an application, we deduce some estimates for the torsion in the class groups and for the average of ramified primes.