[MHGinTN]

Have you ever considered the notion that dimension Time may be the source of inertial resistance?... All things that exist in spacetime are therefore in the 'flow of time' in one way common to all ... all things are in motion if they exist 'inside' the universe of our spacetime. Could it be that there is a frame of temporal reference which is more than just 'inside' our frame of reference and therefore our brane exists stuck to a larger brane which contains our brane? It is this notion which relates to what I offered of volumetric time ... the volume would contain the plane of our time but be a greater temporal field; inertia results from 'things' of our spacetime being stuck 'in' the volume of the greater temporal background.

One might be tempted to consider gravity as an aspect of a greater brane which causes inertia, but this won't specifically work since the entire universe is a gravitational field sourced in the 'allness' and 'concentrated' at spots of accumulated mass. The physical processes of the universe would be variable depending upon the mass neighborhood, upsetting the extreme balance of the whole.

[Alamo-Girl]

Thank you so much for sharing your insights on the question wrt volumetric time!

The only other speculation I've seen which speaks of temporal phases wrt to the "origin of inertia" question is here.

A brane translates to a membrane in my way of looking at the space/time continuum. A field, OTOH, exists at all points of space/time (regardless of dimensions.)