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Pin Groups in General Relativity

There are eight possible Pin groups that can be used to describe the transformation behaviour of fermions under parity and time reversal. We show that only two of these are compatible with general relativity, in the sense that the configuration space of fermions coupled to gravity transforms appropriately under the space-time diffeomorphism group.

preprint2020arXivOpen access
Bas Janssens
math-phmath.MPgr-qcmath.DGhep-th
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Bas Janssens

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