No motions of bodies produce GW's

A physical consequence of a well-known Fermi's theorem: no motion of masses can generate gravitational waves.

The physical non-existence of gravitational waves (GW's) as a consequence of the non-existence in general relativity (GR) of physically privileged reference frames, and of the ``plasticity'' of relativistic notion of a coordinate system.

A quite evident and radical argument proves that no motion of masses can generate gravitational waves.

I give here: i) a very simple proof that the physical non-existence of gravitational waves (GW's) is quite consistent with the basic principles of general relativity (GR); ii) a new argument against the physical existence of GW's; iii) a criticism of Fock's treatment of the GW's; iv) some remarks on recent experimental investigations concerning the GW's.

The full relativity of the concepts of motion and rest, which is characteristic of the Einsteinian general relativity (GR), does not allow the generation of physical gravitational waves (GW's). -- The undulatory nature of a metric tensor is not an invariant property, but depends on the coordinate frame. -- An undulation of a metric tensor is propagated with a speed that can have any value between zero and infinite.

In general relativity (GR) no observer is physically privileged. As a strict consequence, it can be shown that the physical generation of gravitational waves (GW's) is quite impossible.

A proof that the generation of gravitational waves is physically impossible.

We show that the Maxwell equations describing an electromagnetic wave are a mathematical consequence of the Einstein equations for the same wave. This fact is significant for the problem of the Einsteinian metrics corresponding to the electromagnetic waves.

The gravitational waves are non-physical sinuosities generated, in the last analysis, by undulating reference frames.

There is a perfect concordance between Friedmann's cosmological models and the correspondent (purely gravitational interactions and negligible pressure) Newtonian models. This renders quite intuitive the fact that in general relativity no motion of bodies generates gravitational waves.