A11pl3Z

[stryder]

That's physics. Every mass interacts with every other mass, and the only body that can be considered "at rest" is a co-moving body in the same frame of reference (same direction and velocity). There is no "rest frame" or "absolute rest" in physics.

That's Classical Physics, however there is potentially some future changes through Theoretical Physics that might come due.

General Relativity is not classical physics.
There's no frontier of physics that foresees any change in frames of reference.

Multiworlds.

[Syne]

That's physics. Every mass interacts with every other mass, and the only body that can be considered "at rest" is a co-moving body in the same frame of reference (same direction and velocity). There is no "rest frame" or "absolute rest" in physics.

That's Classical Physics, however there is potentially some future changes through Theoretical Physics that might come due.

General Relativity is not classical physics.
There's no frontier of physics that foresees any change in frames of reference.

Multiworlds.

The Many-worlds interpretation of QM doesn't change the physics of GR domain frames of reference. This is because there is no theory of quantum gravity, whereby a QM interpretation could alter General Relativity. Even if there were, we have no way to prove that Many-worlds is a better, more valid interpretation of QM than several others. And if there were, GR has proven so successful that a theory of quantum gravity would still have to reproduce the predictions of GR, hence maintaining frames of reference within that domain.