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A maximal-acceleration invariant quantum field is defined on thespace-time tangent bundle with vanishing eigenvalue when acted onby the Laplace-Beltrami operator of the bundle, and the case isaddressed in which the space-time is Minkowskian, andthe field is Lorentz invariant. In this case, the field is shownto be automatically regularized at the Planck scale, and particlespectra are cut off at extremely high energies. The microcausalityis addressed by calculating the appropriate field commutators;and it is shown that provided the adjoint field is consistentlygeneralized, the necessary commutators are vanishing and thefield is microcausal, but that there are Planck-scalemodifications of the boundary of the causal domain that aresignificant for extremely large relative four-velocities betweenthe separated space-time points. For vanishing relativefour-velocity, the causal domain is canonical. The geometry of thecausal domain indicates that near the Planck scale, causalconnectivity may occur between spacelike separated points, andalso at larger scales for extremely large relativefour-velocities

Lorentz-invariant quantum fields in the space-time tangent bundle