Simon Catterall, Jay Hubisz
We examine the formulation of Kähler fermions on spacetimes with Lorentz signature. In practice we focus on Minkowski spacetime since most of the difficulties that are encountered are visible even when the spacetime is flat. We show that the theory, when interpreted as a Lorentz invariant theory of forms or antisymmetric tensor fields, is non-unitary. We show that unitarity can be restored provided one adopts a modified inner product on the Hilbert space. This modified inner product requires the insertion of an operator J that anti-commutes with certain modes of the Kähler field in such a way as to guarantee all states have positive norm. We give an explicit (and local) form for J and show that while it commutes with the Hamiltonian, it is incompatible with the Lorentz transformation properties of the tensor fields. In flat space, the unitarized formulation is equivalent to 4 Dirac fermions.