One massless particle equals two Dirac singletons - Letters in Mathematical Physics
- ️Fronsdal, C.
- ️Fri Sep 01 1978
Abstract
The ‘remarkable representations of the 3+2 de Sitter group’, discovered by Dirac, later called singleton representations and here denoted Di and Rac, are shown to possess the following truly remarkable property: Each of the direct products Di ⊗ Di, Di ⊗ Rac, and Rac ⊗ Rac decomposes into a direct sum of unitary, irreducible representations, each of which admits an extension to a unitary, irreducible representation of the conformal group SO(4, 2). Therefore, in de Sitter space, every state of a free, ‘massless’ particle may be interpreted as a state of two free singletons — and vice versa. The term ‘massless’ is associated with a set of particle-like representations of SO(3, 2) that, besides the noted conformal extension, exhibit other phenomena typical of masslessness, especially gauge invariance.
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M. Flato
Present address: Physique-Mathématique, Faculté des Sciences, Mirande, Université de Dijon, 21, Dijon, France
Authors and Affiliations
Dept. of Physics, University of California, 90024, Los Angeles, Calif., USA
M. Flato & C. Fronsdal
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- M. Flato
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- C. Fronsdal
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Flato, M., Fronsdal, C. One massless particle equals two Dirac singletons. Lett Math Phys 2, 421–426 (1978). https://doi.org/10.1007/BF00400170
Received: 24 April 1978
Issue Date: September 1978
DOI: https://doi.org/10.1007/BF00400170