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capítulo de libro
"The BCS-BRST Solution to the Nuclear Pairing Problem: A Case of Broken Symmetries"
Daniel R. Bes
Capítulo A: "BCS Pairing (and Beyond) in Nuclear Structure and Dynamics" del libro Fifty Years of Nuclear BCS - Pairing in Finite Systems, Eds. R.A. Broglia and V.Zelevinsky, World Scientific Publishing Co., Singapore (2013), 692 pp
ISBN: 978-981-4412-48-3 (hardcover)
978-981-4412-50-6 (eBook)
The BCS solution epitomizes the many-body systems described by means of states involving a breakdown of the symmetry of the Hamiltonian. The symmetry can be restored by the introduction of collective variables and associated constraints. This restoration may be implemented by means of the more powerful BRST symmetry. The final solution allows for a perturbation expansion, involving very few complications in addition to those involved in usual perturbation treatments of residual interactions.
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