Random matrix ensembles with random interactions: Results for EGUE(2)-SU(4)

Details Random matrix ensembles with random interactions: Results for EGUE(2)-SU(4) Random matrix ensembles with random interactions: Results for EGUE(2)-SU(4)

2009-04-03

arxiv.org/abs/0904.0551v2

Pramana 73:521-532,2009

Physics

Nuclear Physics

Nuclear Theory

11 pages, 2 figures, some formulas in Table 1 corrected, Table 1 changed to Table 1 and 2, Fig. 2 modified

Scientific paper

10.1007/s12043-009-0104-x

We introduce in this paper embedded Gaussian unitary ensemble of random matrices, for $m$ fermions in $\Omega$ number of single particle orbits, generated by random two-body interactions that are SU(4) scalar, called EGUE(2)-SU(4). Here the SU(4) algebra corresponds to Wigner's supermultiplet SU(4) symmetry in nuclei. Formulation based on Wigner-Racah algebra of the embedding algebra $U(4\Omega) \supset U(\Omega) \otimes SU(4)$ allows for analytical treatment of this ensemble and using this analytical formulas are derived for the covariances in energy centroids and spectral variances. It is found that these covariances increase in magnitude as we go from EGUE(2) to EGUE(2)-$\cs$ to EGUE(2)-SU(4) implying that symmetries may be responsible for chaos in finite interacting quantum systems.

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