Abstract
We construct theories of free fermions in (2n − 1)-dimensions with SU(1, n) spacetime symmetry from the null reduction of fermions on a 2n-dimensional Ω-deformed Minkowski background for n = 2 and n = 3. These play a role in the 5d SU(1, 3)-invariant theories that are conjectured to offer a full description of certain 6d superconformal field theories. We find the (2n − 1)-dimensional manifestation of the supersymmetry of a free 2n-dimensional boson-fermion system, which we use to fix the fermion two-point functions. It is then shown that the full 2n-dimensional two-point function can be recovered through resummation. Limits of the theories are considered, and it is observed that both Galilean and Carrollian field theories appear in different regimes. We confirm that the correlation functions obey the SU(1, n) Ward identities and the representations of the fermions under this group are discussed.
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Acknowledgments
We thank Neil Lambert for the suggestion of this topic and many helpful discussions. J.S. is supported by the STFC studentship ST/W507556/1.
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Smith, J. Fermions with SU(1, n) spacetime symmetry. J. High Energ. Phys. 2023, 32 (2023). https://doi.org/10.1007/JHEP11(2023)032
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DOI: https://doi.org/10.1007/JHEP11(2023)032