# In a universe where the speed of light is infinite, are relativistic models and Newtonian models equivalent?

Take our universe. Observations are consistent with relativity, but not consistent with Newtonian mechanics. Assume that our current (relativistic) model of gravitation is correct. Now increase $c$ to infinity. Experimental observations in this altered universe are still consistent with relativity (by the assumption that relativity is correct). Are they now consistent with Newtonian mechanics as well?

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In terms of special relativity versus Newtonian mechanics, the answer is yes. However in terms of general relativity this would be a much different universe. Instead of having curvature in a 4 dimensional Minkowki space-time, We would have a 1 dimensional time and a 3 dimensional space universe with no possible connections between space and time. So I don't think the equations of general relativity would result in the kind of gravitational forces we experience in our universe.

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Accepting this because the gallery appears to like it, not because I understand it. I shall go and learn about Minkowski spacetime now. –  Robert Norris Jan 10 '12 at 21:34

i think this is the same as asking, for values of v << c will newtonian mechanics apply? (since if c is very large, infinite if you will) if you word the question like that, the answer is obvious that yes, newtonian mechanics would be the only ones that ever apply.

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