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## Main Question or Discussion Point

**Are some vacuums more "slippery" than others?**

What is the proprogation of electric and magnetic fields near a neutron star, should there be a delay if a light signal passes near by? There is a delay, but the speed of light is the same! It took longer to get to other side, but the speed is the same! Mustn't that have been the opposite of a shortcut? Is the delay proportional to the path extension (note that notion of path is not simple-easy in GR)?

How do you calculate the permittivity and permeability of the vacuum as a function of radius from charged subatomic particles inside a plane of glass?

Couldn't the factor of a "lorentz contraction" or a like factor be the same as the factor by which [itex](electric\ permittivity*magnetic\ permeability)^{1/2}[/itex] of a medium increases? It is utterly false, unconcievable, and unphysical that all lorentz contractions (as well as refractive indices) have to do with is the increase of [itex](electric\ permittivity*magnetic\ permeability)^{1/2}[/itex]?

Why is curvature of space time not considered as due to local variation of the local electric permittivity and magnetic permeability of the vacuum with respect to a distant observer? Note that angular momentum of a system of fundmental particles (including emitted photons) is conserved, with time dilation of the system relative to an external observer (affecting the relative rotations of particles) being compensated with the increase in inertial mass of the system of particles.

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