Editing Luminiferous aether (section)

=== Other models ===
{{Main|Aether theories}}
In later years there have been a few individuals who advocated a neo-Lorentzian approach to physics, which is Lorentzian in the sense of positing an absolute true state of rest that is undetectable and which plays no role in the predictions of the theory. (No violations of [[Lorentz covariance]] have ever been detected, despite strenuous efforts.) Hence these theories resemble the 19th century aether theories in name only. For example, the founder of quantum field theory, [[Paul Dirac]], stated in 1951 in an article in Nature, titled "Is there an Aether?" that "we are rather forced to have an aether".<ref>Dirac wrote about his theory: "We have now the velocity at all points of space-time, playing a fundamental part in electrodynamics. It is natural to regard it as the velocity of some real physical thing. Thus with the new theory of electrodynamics we are rather forced to have an aether."</ref><ref group=A name=dirac /> However, Dirac never formulated a complete theory, and so his speculations found no acceptance by the scientific community.