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Originally Posted by dleviwing Guelle;
Spacetime was called "ETHER" first. It has also been called Quantum Foam, Aether, and a few other names. There is more to Einstein's paper than just the exert I provided. If you replace spacetime with ether in your other post, (atomic matter in contact with spacetime) you will see cause and effect. Next is to view ether as matter in its ultimate gaseous state or "random chaotic wave functions". No uniform motion.
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Quantum gravity theories like Heim Theory or Loop Quantum Gravity, which unite relativity and quantum mechanics, do have a sort of ether which is consistent with relativity - e.g. the metronic lattice which undisturbed can look like 'pure vacuum' but with any sort of distortion, whether temporary (virtual) or more permanent ('real') looks like particles.
By the way, the original ether link quoted at the top of this thread looks like rubbish - for serious physics of the vacuum one is better off with e.g. Calif. Inst. Technology: Haisch even has ideas of how to extract energy from the vacuum a la Casimir or similar:
http://www.calphysics.org/sci_articles.html
- note the logo here may have been aped by the pseudo-scientific Aether crowd.