Noncompact groups and the excitation spectrum in superfluid helium-4
β Scribed by Mubarak Ahmed
- Publisher
- Springer US
- Year
- 1976
- Tongue
- English
- Weight
- 249 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0022-2291
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π SIMILAR VOLUMES
The Bethe-Salpeter equation for two-dimensional excitons is solved in the low-density limit. The analysis of the collective modes leads to a spectrum of the Bogolubov type. It was found that the critical temperature of the Kosterlitz-Thouless phase transition to exciton superfluidity scales linearly
The Lie algebra, and the group governing configuration interaction in many of these quasi-bound St2teS are a ComWCt form of Dzr and the compact O(4). respectively. An isomorphic timedependent algebra and group governs their ionization. In 1973 I showed that there is an O(4) group governing configur