A question about an interesting implication about inertia drawn in following considerations by Luboš Motl:
[...] Also, the privileged reference frame will mean that any moving object will instantly - within a Planck time or so - dissipate all of its kinetic energy to the extra degrees of freedom in the discrete structure. So the "vacuum" will actually behave as a superdense liquid that immediately stops any "swimmer": inertia becomes totally impossible. One could continue with other flagrant contradictions.
The context was about which properties one could draw about specetime if it would hypothetically assumed to be discrete.
One of the implications one can draw would be that it would neccessarily have a privileged frame of reference.
My question is why this as immediate consequence would also imply that in such hypothetical discrete spacetime any moving massive object would instantly have to dissipate all of its kinetic energy to discrete "spacetime blocks"? Ie, that any object flying around there would be immediately be slowed down; equivalently no inertia effects can appear?
More precisely, why does this solely follow immediately as formal consequence from that such putative discretene specetime would admit a privileged frame of reference?
In other words, does it imply that any putative spacetime model admitting privileged frame of reference would not admit inertia behavior for objects it contains?
