Asymptotic expansions relating to the lengths of longest monotone subsequences of involutions

We study the distribution of the length of longest monotone subsequences in random (fixed-point free) involutions of $n$ integers as $n$ grows large, establishing asymptotic expansions in powers of $n^{-1\mathrm{/}6}$ in the general case and in powers of $n^{-1\mathrm{/}3}$ in the fixed-point free cases. Whilst the limit laws were shown by Baik and Rains to be one of the Tracy-Widom distributions $F_{\beta }$ for $\beta =1$ or $\beta =4$, we find explicit analytic expressions of the first few expansion terms as linear combinations of higher order derivatives of $F_{\beta }$ with rational polynomial coefficients. Our derivation is based on a concept of generalized analytic de-Poissonization and is subject to the validity of certain hypotheses for which we provide compelling (computational) evidence. In a preparatory step expansions of the hard-to-soft edge transition laws of L$\beta$E are studied, which are lifted into expansions of the generalized Poissonized length distributions for large intensities. (This paper continues our work arXiv:2301.02022, which established similar results in the case of general permutations and $\beta =2$.)