Warp Drives and Negative Energy: Physicists Give Chances of Faster-Than-Light Space Travel a Boost

https://scitechdaily.com ^ | MAY 16, 2021 | By MARIO BORUNDA, OKLAHOMA STATE UNIVERSITY

[NobleFree]

If your physics tells you that in some circumstances, an entire dimension of space collapses and the universe becomes 2-dimensional (as relativity does in some reference frames)

False.

"One of the defining conditions of an inertial reference frame is that there exists a proper orthochronous Lorentz transformation which converts that frame into any other inertial reference frame, and vice versa. But for all such transformations, the starting and ending frames are moving at some relative speed less than c; however, any photons that may exist will be moving at speed c in both frames. There is no way to use a Lorentz transformation to produce an inertial reference frame that moves at c with respect to any other inertial frame" - https://physics.stackexchange.com/a/21972

[NobleFree]

This point is elaborated at https://wtamu.edu/~cbaird/sq/2014/11/03/why-is-time-frozen-from-lights-perspective/

[Boogieman]

What has that to do with anything I said? If you set a reference frame to the photon, moving at c, one of the 3 spatial dimensions collapses, due to length contraction in the direction of the photon’s travel. Of course it’s still possible to translate to any other reference frame with Lorentz transformations, but the fact remains that there are reference frames that depict the universe as 2-dimensional, which is not an accurate depiction of reality as we intuitively experience it. This highlights why “no preferred reference frame” is not the same as saying “all reference frames are equally valid ontologically”.

[NobleFree]

If you set a reference frame to the photon

You can't - that's the point of my last two posts and the sources therein.