Distribution of hooks in self-conjugate partitions

Abstract

We confirm the speculation that the distribution of $t$-hooks among unrestricted integer partitions essentially descends to self-conjugate partitions. Namely, we prove that the number of hooks of length $t$ among the size $n$ self-conjugate partitions is asymptotically normally distributed with mean $\mu_t(n) \sim \frac{\sqrt{6n}}{\pi} + \frac{3}{\pi^2} - \frac{t}{2}+\frac{\delta_t}{4}$ and variance $\sigma_t^2(n) \sim \frac{(\pi^2 - 6) \sqrt{6n}}{\pi^3},$ where $\delta_t:=1$ if $t$ is odd, and is 0 otherwise.