
Relativity without Einstein
It’s true! The concept of 4dimensional spacetime is by no means necessary in order to explain the physics of relativity!Yes, relativity exists in our physical world. – But do we need Einstein?
No, we do not. And more than that:
Einstein's 4dimensional spacetime is
unnecessarily compli The original approach to relativity as used by Hendrid A. Lorentz avoids these complications and ends up with a theory which is not only much easier to understand and more closely related to physical realities, but also solves problems which are till now unresolved.
What is the difference between Einstein and Lorentz? The fundamental difference in the starting points of Einstein and Lorentz was their assessment of the speed of light. The existing measurements of the speed of light seem at the first glance compatible with Einstein's assumptions. However, the constancy of c with respect to any moving frame of reference is only apparent, because the real variations in c are obscured by changes in the moving instruments used to measure it. And Einstein's assumption can be clearly refuted by the Sagnac experiment.
Einstein based his approach to relativity on postulates, called principles. His basic postulate is the principle of relativity. It says that the physicsal laws have the same form in any intertial system. This also covers the constancy of the speed of light [1]. This, however, is purely an assumption; the appropriate measurements do not confirm this result [2]. The approach of Lorentz is based on the properties of elementary particles and fields. These properties are not postulates but facts established in an independent context, namely particle physics. The advantage which we see in the Lorentzian approach is that it is founded in physics, as well as being easier to understand and requiring a simpler mathematical treatment. This is particularly true of the processes in General Relativity, which become so simple that they can be treated at school  with similar results to the complicated reasoning of Einstein. And it has the potential to solve problems like cosmological inflation, dark matter, and dark energy.
Now the details: What we call RELATIVITY comprises the following measureable phenomena: For Special Relativity:
(1) Physical objects contract when in motion
(4) The speed of light ‘c’
is reduced in a gravitational field Einstein explained the phenomena of relativity by assuming that space and time form a close unit, which is described by the 4dimensional geometry of “spacetime”. In the general case, this 4dimensional system is curved. The mathematical treatment
of 4dimensional curved space is a highly challenging task. Only few physicists are able to do this.
How does this work?
Einstein’s assumptions regarding spacetime can be replaced by the following facts, which exist independently of relativity:
For details of this process please refer to the origin of relativity and the origin of mass.
For details of this process, please refer to the origin of gravity. 

The conflict between Einstein's basic assumptions and actual observations


 
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