Abstract
We have measured variations in the times of flight of 25fsec laser pulses, along a given distance from A to B, in different directions in space. Flights from A to B are termed one-way versus two-way - from A to B and back to A. The isotropy obtained, despite the motion of Earth in global space, supports the possibility that the local space of Earth, and probably that of other stars, is confined - captured inside the sphere of the star. To maintain space continuity, despite this confinement, space must necessarily be an elastic fluid, as Einstein, for a different reason, concluded in 1939.
 
 In addition, we wonder if this confinement of a local space in a star or galaxy explains its non-participation in the Hubble expansion of space.
 
 Our experiment used an auto-correlation technique that dispels the need for clocks, which in one-way measurements require a problematic synchronization scheme.
Highlights
In the past, the understanding was that light doesn't need a medium to propagate through (Einstein, 1905); no need for an Aether
It is clear that electromagnetic waves are the vibrations of an electromagnetic medium, which might be space itself as some are arguing
Intrinsic light velocity is the velocity of the electromagnetic medium’s light wave, which is dependent on its permittivity and permeability
Summary
The understanding was that light doesn't need a medium to propagate through (Einstein, 1905); no need for an Aether. Mutual scattering of light beams in free space, according to the electromagnetic theory, is impossible, since the equations of the theory are linear. This, accrues in free space with high-intensity laser beams (ATLAS Collaboration, 2019). This phenomenon can only be attributed to the nonlinearity of an existing medium, in which the beams interact. Logically you have to attribute the nonlinearity whether to an electromagnetic medium or space itself. Note that this medium, in classical physics and according to GR, follows space topology, as evident from the bending of light. Intrinsic light velocity is the velocity of the electromagnetic medium’s light wave, which is dependent on its permittivity and permeability
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