Quantum Dirac Field On Moyal-Minkowski Spacetime - Illustrating Quantum Field Theory Over Lorentzian Spectral Geometry

A sketch of an approach towards Lorentzian spectral geometry (based on joint work with Mario Paschke) is described, together with a general way to define abstractly the quantized Dirac field on such Lorentzian spectral geometries. Moyal-Minkowski spacetime serves as an example. The scattering of the quantized Dirac field by a non-commutative (Moyal-deformed) action of an external scalar potential is investigated. It is shown that differentiating the S-matrix with respect to the strength of the scattering potential gives rise to quantum field operators depending on elements of the non-commutative algebra entering the spectral geometry description of Moyal-Minkowski spacetime, in the spirit of '' Bogoliubov's formula '', in analogy to the situation found in external potential scattering by a usual scalar potential. (author)