An additive divisor problem in \(\mathbb{Z}[i]\)

Abstract

Let \(\tau(\alpha)\) be the number of divisors of the Gaussian integer \(\alpha\). An asymptotic formula for the summatory function \(\sum\limits_{N(\alpha)\leq x}\tau(\alpha)\tau(\alpha+\beta)\) is obtained under the condition \(N(\beta)\leq x^{3/8}\). This is a generalization of the well-known additive divisor problem for the natural numbers.