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Asymptotic limit of cumulants and higher order free cumulants of complex Wigner matrices https://arxiv.org/abs/2407.17608 #mathPR

Asymptotic limit of cumulants and higher order free cumulants of complex Wigner matrices

We compute the fluctuation moments $α_{m_1,\dots,m_r}$ of a Complex Wigner Matrix $X_N$ given by the limit $\lim_{N\rightarrow\infty}N^{r-2}k_r(Tr(X_N^{m_1}),\dots,Tr(X_N^{m_r}))$. We prove the limit exists and characterize the leading order via planar graphs that result to be trees. We prove these graphs can be counted by the set of non-crossing partitioned permutations which permit us to express the moments $α_{m_1,\dots,m_r}$ in terms of simpler quantities $\overlineκ_{m_1,\dots,m_r}$ which we call the pseudo-cumulants. We prove the pseudo-cumulants coincide with the higher order free cumulants up to $r=4$ which permit us to find the higher order free cumulants $κ_{m_1,\dots,m_r}$ associated to the moment sequence $α_{m_1,\dots,m_r}$ up to order 4.

arxiv.org
July 27, 2024 at 3:10 AM · · feed2toot · 0 · 0 · 0
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