- 06-157 Arne Jensen, Gheorghe Nenciu
- On the Fermi Golden Rule: Degenerate Eigenvalues
May 14, 06
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Abstract. We review and further develop the framework in  of the
stationary theory of resonances, arising by perturbation of either
threshold, or embedded in the continuum, eigenvalues. While in 
only non-degenerate eigenvalues were considered, here we add some results
for the degenerate case.
 A. Jensen and G. Nenciu, The Fermi Golden Rule and its form
at thresholds in odd dimensions,
Comm. Math. Phys. 261 (2006), 693--727.