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- W2212142004 abstract "The ordinary Bondi—Metzner—Sachs (BMS) group B is the common asymptotic symmetry group of all radiating, asymptotically flat, Lorentzian space—times. As such, B is the best candidate for the universal symmetry group of General Relativity (G.R.). However, in studying quantum gravity, space—times with signatures other than the usual Lorentzian one, and complex space-times, are frequently considered. Generalisations of B appropriate to these other signatures have been defined earlier. In particular, the generalisation B(2, 2) appropriate to the ultrahyperbolic signature (+,+, —,—) has been described in detail, and the study of its irreducible unitary representations (IRs) of B(2, 2) has been initiated. We continue this programme by introducing a new group UHB(2, 2) in the group theoretical study of ultrahyperbolic G.R. which happens to be a proper subgroup of B(2, 2). In this paper we report on the first general results on the representation theory of UHB(2, 2). In particular the main general results are that the all little groups of UHB(2, 2) are compact and that the Wigner—Mackey's inducing construction is exhaustive despite the fact that UHB(2, 2) is not locally compact in the employed Hilbert topology." @default.
- W2212142004 created "2016-06-24" @default.
- W2212142004 creator A5061358424 @default.
- W2212142004 date "2015-07-03" @default.
- W2212142004 modified "2023-09-25" @default.
- W2212142004 title "Representations of the ultrahyperbolic BMS groupUHB(2, 2). I. General Results" @default.
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- W2212142004 doi "https://doi.org/10.1088/1742-6596/626/1/012066" @default.
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