On the Representation Theory of the Ultrahyperbolic BMS group UHB(2, 2). I. General Results

3rd International Conference on Mathematical Modeling in Physical Sciences

物理学;数学

Melas, Evangelos^1

Technological Educational Institution of Patras, Department of Management, Greece^1

关键词: Complex space;    General Relativity;    Irreducible representations;    Locally compact;    Representation theory;    Space time;    Symmetry groups;    Theoretical study;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/574/1/012126/pdf
DOI  :  10.1088/1742-6596/574/1/012126

来源: IOP

【 摘 要 】

The Bondi-Metzner-Sachs (BMS) group B is the common asymptotic group of all asymptotically flat (lorentzian) space-times, and is the best candidate for the universal symmetry group of General Relativity (G.R.). B admits generalizations to real space-times of any signature, to complex space-times, and supersymmetric generalizations for any space- time dimension. With this motivation McCarthy constructed the strongly continuous unitary irreducible representations (IRs) of B some time ago, and he identified B(2,2) as the generalization of B appropriate to the to the 'ultrahyperbolic signature' (+,+,-,-) and asymptotic flatness in null directions. 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 short 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. At the end of the paper we comment on the significance of these results.