Precritical pair fluctuations and formation of a pseudogap in low-density nuclear matter

Details Precritical pair fluctuations and formation of a pseudogap in low-density nuclear matter Precritical pair fluctuations and formation of a pseudogap in low-density nuclear matter

1999-02-17

arxiv.org/abs/nucl-th/9902038v1

Phys.Rev.Lett. 83 (1999) 1926-1929

Physics

Nuclear Physics

Nuclear Theory

4 pages, 2 figures, using psfig.sty (included)

Scientific paper

10.1103/PhysRevLett.83.1926

Low-density nuclear matter at finite temperature is considered representing the strong coupling situation of a highly correlated fermion system. One-particle se lf-energies and the density of states in the vicinity of the pairing transition point are presented. Within the Green function approach model calculations are p erformed using the thermodynamic $T$ matrix in ladder approximation. As a main r esult the formation of a pseudogap in the level density near the critical temper ature of the pairing phase transition has been found. It is shown that compared to mean field, the picture of the onset of the pairing transition is essentially changed if correlations are taken into account.

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