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Spacetime Is Real

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Posted by Rowanda on December 24, 2003 16:35:11 UTC

Dear Whittier,

You are confusing coordinates with spacetime. Einstein made it clear that space is real when his Theory of General Relativity predicted that the force of gravity can be replaced by geometric variations of flat space. That leaves open the question of whether time ia a real dimension or just a representation. Time certainly exists but it may not be a dimension.

LQG has further soldidfied the real existence of space by proving that it is quantized and independent of coordinate system. That is, the spin network that underlies space and time do not have apriori location in space. Location is derived from the network, as well as time.

Scientific American has a very readable account of LQG by Lee Smolin. A more advanced discussion can be found in the link I provided to on the Big Bang Forum.


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