Eigenvector Occupation Statistics and Extremes in the Rosenzweig-Porter Model

We study the occupation probabilities pᵢ=|uᵢ|² of a normalized bulk eigenvector in the GUE Rosenzweig-Porter model AN=BN+τNGN, with τN²=N1-γ and $1<γ<2$. Conditioning on an eigenvalue at a regular bulk energy E through the normalized one-eigenpair Kac-Rice law, we derive an exact finite-N projective density and reduce its asymptotic analysis to a Hubbard-Stratonovich integral over 2×2 Hermitian matrices, which we evaluate by the saddle-point method. The resulting occupation field is governed by a self-consistent Lorentzian profile with effective resonant size KN(E) N2-γ and local exponential fluctuations. We prove the asymptotics of all generalized inverse participation sums and identify a transition at $q=1/2$. We also obtain a two-branch thickened amplitude-counting spectrum. At the two ends of the occupation field we prove marked Poisson point-process limits: the largest components have Gumbel fluctuations, whereas the smallest component has an exponential limit on the scale N-1-γ. Finally, for every fixed $q>0$ the largest component contributes an asymptotically vanishing fraction of the inverse participation sum, showing that these fixed-q statistics do not freeze. The statements are quenched, uniformly on a high-probability regularity event for the diagonal disorder, and hence also hold in the annealed setting.