Degeneracies in a nonintegrable pairing model
arXiv:0811.4250
Abstract
The evolution pattern of exceptional points is studied in a non-integrable limit of the complex-extended 3-level Richardson-Gaudin model. The appearance of a pseudo-diabolic point from the fusion of two exceptional points is demonstrated in the anti-hermitian limit of the model and studied in some details.
11 pages, 5 figures 27th International Workshop on Nuclear Theory, Rila Mountain, Bulgaria