Einstein Aether Theory
In physics the Einstein æther theory, also called æ-theory, is a controversial generally covariant generalization of general relativity which describes a spacetime endowed with both a metric and a unit timelike vector field named the æther. In particular such theory has a preferred reference frame and so is not Lorentz invariant.
Read more about Einstein Aether Theory: History, Consistency, The Action, Experimental Constraints
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“In so far as the statements of geometry speak about reality, they are not certain, and in so far as they are certain, they do not speak about reality.”
—Albert Einstein (1879–1955)
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—Thomas Henry Huxley (1825–95)