Farr also mentions some physics, but he only just touches on relativity and quantum mechanics and he does not say anything about quantum phase at all. Farr states that the equations of relativity and quantum physics are fully reversible...but that is not true at all. Relativity represents all matter actions on irreversible determinate geodesics paths and those actions are not reversible in any sense and so there is never any causal confusion with relativity. In fact, the irreversible determinate paths of relativity are absolutely predictable to an unlimited classical precision. All precursors are prior to their outcomes and that is local cause and effect.
It is quantum action that shows a quantum causal confusion of time in quantum reversibility. The quantum nature of matter action shows that quantum phase is very important but quantum phase does not play any role in gravity relativity. Reconciling microscopic quantum phase with the macroscopic irreversible reality of gravity relativity provides a nice understanding of time as emergent, not axiomatic.
Time is not an infinitely divisible and continuous flow of the paths of gravity relativity, rather the notion of continuous time emerges from a very large number of discrete reversible quantum matter actions. All quantum action is reversible because even though a precursor occurs for every outcome, the precursor and outcome exist together for some very brief dephasing time. Therefore, one dimension of time emerges from a characteristic dephasing time that comes from the very slow and inexorable change in the universe.
The second time dimension is in the very rapid ticks of atomic clocks, which all run in the same very slow direction of dephasing, the first time dimension. Despite the microscopic reversibility of each pulse of light, the macroscopic nature of an atomic clock results in dephasing and therefore, an irreversible flow of events.
Note that it only seems like time has two dimensions because there are two kinds of things that happen; slow universe changes and fast atom changes. First of all, the universe changes very slowly as a single gravity event and second, atom changes are very fast and very large in number of quantum events. The two dimensions of time simply emerge from the two very different kinds of things that happen in the universe and therefore the flow of time does not exist otherwise....I still like McTaggart’s times though...