The corre&ted density matrix theory is employed and fitrther developed to analyze the one-body density matrix pl(lrl -r2 [) of the normal and superJhtid phases of a strongly interacting Bose system at non-zero temperature. The approach continues the Jormal developnwnt described in an earlier article and is based on a suitable trial ansatz for the many-body density matrix
We study the current-algebra approach to the Gerasimov-Drell-Hearn sum rule,
paying particular attention to the infinite-momentum limit. Employing the
order-alpha^2 Weinberg-Salam model of weak interactions as a testing ground, we
find that the legitimacy of the infinite-momentum limit is intimately connected
with the validity of the naive equal-times algebra of electric charge
densities. Our results considerably reduce the reliability of a recently
proposed modification of the Gerasimov-Drell-Hearn sum rule, originating from
an anomalous charge-density algebra.Comment: 12 pages; 6 figures; LaTeX; submitted to Z.Phys.
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