We explore the structure of momentum distributions of Fermi liquids such ascompletely polarized 3He, unpolarized liquid 3He, and nuclear matter at nonzerotemperatures. The study employs correlated density matrix theory and adapts thealgorithm to deal with spin- and isospin-dependent correlations. The analysisis based on the factor decomposition of the one-body reduced density matrix.The decomposition permits to distinguish between statistical correlations anddynamic (direct) correlations. Together with the concept of renormalizedfermions the formal results open the pathway to investigate the thermalboundaries of normal Fermi phases within correlated density matrix theory. Wealso discuss possible transitions from normal phases to anomalous fermionphases triggered by statistical correlations or by periodic phase-phasestructures.
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