The large N expansion as a local perturbation theory
โ Scribed by A.A Andrianov
- Publisher
- Elsevier Science
- Year
- 1982
- Tongue
- English
- Weight
- 829 KB
- Volume
- 140
- Category
- Article
- ISSN
- 0003-4916
No coin nor oath required. For personal study only.
๐ SIMILAR VOLUMES
An apparent difference between formulating mean field perturbation theory for @\* field theory via path integrals or via functional differential equations when there are external sources present is shown not to exist when mean lield theory is considered as the N= 1 limit of the O(N) @" field theory.
A system of fermions with short-range interactions at finite density is studied using the framework of effective field theory. The effective action formalism for fermions with auxiliary fields leads to a loop expansion in which particle-hole bubbles are resummed to all orders. For spin-independent i