Franco, N.; Eckstein, M.
(Symmetry, Integrability and Geometry: Methods and Applications, 2014)
We investigate the causal relations in the space of states of almost commutative Lorentzian geometries. We fully describe the causal structure of a simple model based on the algebra S(R¹,¹)⊗M₂(C), which has a non-trivial ...