All observations are made possible through electromagnetic (EM) waves (light), which require a propagation medium or ether to propagate their disturbances (wave motion) and make their wave equation causal and predictable. However, Einstein claimed that EM waves were somehow special, they did not require a propagation medium. Einstein’s resulting ether-less predictions, including time travel and no absolute time and space, cannot be measured.
Wave motion without a propagation medium is not possible. Maxwell established the EM propagation medium and Lorentz used the medium to predict EM wave motion in his Lorentz transform. Reinstating the medium now allows observations to be described naturally, rather than concealing their actual events through an artificial ether-less universe. The medium removes all ambiguities and paradoxes present in Einstein’s relativity.
The medium transmits light and gravity and provides the means (compressible medium) for space time distortion to occur through gravity. Although science fiction classics, such as H. G. Well’s Time Machine, have popularized the concept of time travel, according to the new relativity theory this cannot happen, it’s non causal (impossible). However, it is possible causally, to go back to the past but not to interfere, it has already happened. One can, perhaps view a broken cup reassemble itself or a supernova implode. All these observed light predictions are causal because they are based on a causal solution of the light wave equation, an expression that predicts wave motion. But it is not possible to visit the future, it is not a valid solution, it is non causal, it has not yet happened. Thus, causally, ‘time machines’ can only visit the past but cannot interfere with what has already occurred.
Steady difference electric fields (gravity) and unsteady electric fields (light), are propagated by a well measured EM propagation medium, established by Maxwell. A medium is the basic conduit that supports any kind of wave propagation; there is no known physics that can account for wave propagation without a propagation medium. A vacuum is no exception, it is filled with an electrical medium having measured properties, electrical permeability (inertia) and electrical permittivity, (stiffness) which gives the medium its springiness, enabling EM waves to ‘bounce’ through the vacuum. For systems stationary in a stationary medium away from large gravitational bodies, clocks tick at a constant rate and that rate is the same throughout gravity free space.
These were the causal descriptions of physics that were recognized to govern EM wave propagation before the 1900’s; they have not been superseded since. However, Einstein in 1905 made the situation more confusing and less easy to understand by making the non causal claim that a propagation medium is not required to propagate light. This is as irrational as saying water waves don’t need water or sound waves can travel between the source and observer without air. Einstein believed Lorentz’s invariant speed of light (no difference in light speed in space or moving with an object) and Michelson and Morley’s (MM) invariant speed of light (no difference in light speed on Earth propagating in and against the direction of the Earth’s motion through space) supported his ether-less position (no medium).
But this is not so, it is not supported by Maxwell’s field equations and his propagation medium. It is shown that Lorentz’s contraction of time and space, resulting in an invariant speed of light, is based on Maxwell’s propagation medium, and that the medium moves with the Earth explaining the MM in a causal (rational) way. Sagnac in 1913 with rotating mirrors actually demonstrated motion with respect to the medium stationary on the Earth’s surface. Relativists who support the ether-less view, argue that these effects can be explained by relativistic theory. But again this is not possible, on Earth relativistic effects are negligible compared to the classical motional propagation time asymmetry (PTA) created around a moving source. Einstein’s measured predictions work because his field equations are based on a medium, which he did not realize. Whereas, his ether-less predictions are non causal (cannot be measured).
The Maxwell’s EM wave equation does not allow time travel to the future or to interact with the past, only equivalent descriptions given above are allowable. It is therefore non causal to talk about photons (non massive light particles) traveling to the future or past, light particles are messengers transmitting information and making the predictions causal, they are not affected by motion through the propagation medium. However, it is possible to slow a massive particle’s time down through moving at a high speed relative to the medium. Including passing through supposed worm holes (highly compressed medium threads running through space), where time slows dramatically, making huge travel distances possible in a very short time. Or less glamorous time slowing visiting a compressed medium around a large gravitational body. But this is not time travel; it’s just changing the rate of aging between these various situations.
Real time continues to move forward, where the EM wave equation determines causality. A new theory has been developed that corrects and extends Einstein’s relativity, giving new insight. Restoring the medium now allows relativistic effects to be explained in a rational way, removing the mystical ether-less predictions. But at the same time, the new theory confirms Einstein’s measured predictions based on a medium. We can now extend the theory to a more general solution of the wave equation, not completed previously. For example, distinction can be made between sources (satellites) and observers (telescopes) in motion, not possible without a medium reference. This allows source and observer motion to be plotted on the same medium based space-time diagram, predicting new observations.
Finally, the medium’s restoration now allows the unification of electromagnetism and gravity. Einstein, not recognizing the medium existence, endeavored to achieve unification in his later years without success. Light and gravity, shown to be two forms of the same electric field, now form a common reference between these fields. The medium transmits steady electrostatic fields, clothes sticking together in the cloths drier through electrons being knocked out of orbit, unsteady electric fields through electrons jumping orbit causing electromagnetic disturbances (light), steady difference electric fields from atomic dipoles creating gravity, and residual gravity fields from the total mass in the universe apposing changes in speed of charges (mass acceleration), generating mass inertia.