Originally posted by longhorn
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One of the fundamental discoveries of Einstein is that in our universe, there is indeed no fixed space-time background (Standard Model). In Einstein's theory of general relativity, which replaces Newton's theory of mechanics and the gravitational force (Standard Model), the geometry of spacetime is not fixed. Instead it is an evolving, dynamical quantity (Evolving). Physicists intent on describing our universe cannot just [assume a given geometry].
Instead, geometry is something that needs to be determined by solving (critical free expression or thought) certain equations that include all the effects of matter and energy.
http://www.einstein-online.info/spot...d_independence
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