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portada Concepts in Hadron Physics: Proceedings of the x. Internationale Universitätswochen für Kernphysik 1971 der Karl-Franzens-Universität Graz, at. – 13Th March 1971 (Few-Body Systems, 8
Type
Physical Book
Publisher
Author
Language
English
Pages
441
Format
Paperback
ISBN13
9783709182864
Edition No.
1

Concepts in Hadron Physics: Proceedings of the x. Internationale Universitätswochen für Kernphysik 1971 der Karl-Franzens-Universität Graz, at. – 13Th March 1971 (Few-Body Systems, 8

Urban Paul (Author) · Springer · Paperback

Concepts in Hadron Physics: Proceedings of the x. Internationale Universitätswochen für Kernphysik 1971 der Karl-Franzens-Universität Graz, at. – 13Th March 1971 (Few-Body Systems, 8 - Urban Paul

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Synopsis "Concepts in Hadron Physics: Proceedings of the x. Internationale Universitätswochen für Kernphysik 1971 der Karl-Franzens-Universität Graz, at. – 13Th March 1971 (Few-Body Systems, 8"

Soluble quantum field theory models are a rare commodity. An infinite number of degrees of freedom and noncompact invariance groups have a nasty habit of ex- ploding in the model-makers' face. Nevertheless, impor- tant progress has recently been made in the class of superrenormalizable relativistic theories, such as a self-interacting boson in a two-dimensional space time [ 1]. These results have been obtained starting with the free field and adding the interaction in a carefully controlled way. Yet, the models successfully studied in this way do DQ have an infinite field strength renormalization, which, at least according to perturbation theory, should appear for realistic relativistic models in four-dimensional space time. 2 !Y !9n_ g_ h _ gg 1 The ultralocal scalar field theories discussed in these lecture notes are likewise motivated by relativistic theories but are based on a different approximatiGn. This approximation formally amounts to dropping the spatial gradient term from the Hamiltonian rather than the non- linear interaction. For a self-interacting boson field in a space-time of (s+l) dimensions (s l), the classical ultralocal model Hamiltonian reads (1-1) The quantum theory of this model is the subject of the present paper. This model differs formally from a rela- tivistic theory by the term f![Z Cl( )]2 d which, it is hoped, can, in one or another way, be added as a pertur- 229 bation in the quantum theory. However, that still remains a problem for the future, and we confine our remarks to . . a careful study of the "unperturbed" model (1-1).

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