Building on the causal-Machian emergent time theory Jaster2026a and its Planck-scale regularisation Jaster2026b, we examine the implications for quantum field theory in an exploratory and phenomenological spirit. All field actions are evaluated on the physical clock metric g_; the factor in the Lagrangian density follows from the identity -g=-q and is geometrically derived. We work in signature (-, +, +, +) with the convention L-12g^_\, _. Throughout the paper is treated as a fixed semiclassical background in the fixed- approximation; the self-consistent variation generates non-local additional terms and is an open task. Two variants are analysed. In the base model a single cosmological causal field 1 governs all current-epoch physics; all Standard Model predictions that depend only on the local metric are reproduced to the precision of 1- e^-10^{60} (preferred-frame effects from UH^ are not included in this estimate). In the scale-separation model = ₂₎ₒ₌ ₋₎₂, a local causal field ₋₎₂ at the scale m ₋₎₂^-1 is introduced as an approximation valid to O (H ₄ₖ/mH) 10^-17 and may provide candidate ingredients for a modified electroweak phase transition and for the Sakharov conditions; quantitative predictions require calculations not yet performed. The scale-separation model introduces no new dimensionful parameter, but a dimensionless coupling (Section 3. 3) remains undetermined. The scalar is a semiclassical constraint functional requiring no independent quantisation within the present framework.
A. Jaster (Sun,) studied this question.