Quantum fields give us a feeling as if there should be an ultimate stationary reference frame in our universe since the vacuum is not an empty space but is filled with these fields. This issue is quite non-trivial and I was talking also with professional physicists who were also confused about this topic. In this video, I explain briefly how quantum field theory was created and what these fields mean. It becomes very obvious why these fields can't serve as an ultimate stationary frame of reference in our universe since their Lagrangian densities are invariant under Lorentz transformations.
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