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Universal noninteger ‘‘ground-state degeneracy’’ in critical quantum systems
Abstract
One-dimensional critical quantum sytems have a universal, intensive ``ground-state degeneracy,'' g, which depends on the universality class of the boundary conditions, and is in general noninteger. This is calculated, using the conjectured boundary conditions corresponding to a multichannel Kondo impurity and shown to agree with Bethe-ansatz results. g is argued to decrease under renormalization from a less stable to a more stable critical point and plays a role in boundary critical phenomena quite analogous to that played by c, the conformal anomaly, in the bulk case.
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Research works printed but not linked: 15
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Metadata
- Authors
- Affleck, I., & Ludwig, A. W. W.
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 1991-07-08
- Volume
- 67
- Issue
- 2
- Pages
- 161-164
- ISSN
- 0031-9007 (ISSN-L)
- OpenAlex
- W2094219754
- Cited by
- 999
- References
- 0
- FWCI
- 8.45
- Type
- journal article
- Language
- en
- Open access
- closed
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