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This equation suggests a path integral, of a Lagrangian that contains terms for both general relativity and the Standard Model in highly abbreviated form. Compressing it all into one line is a stunt, of course, rather than an actually useful equation. :) It glosses over many technical issues (for instance that we don't actually know how to do quantum ...


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It is important to remember that Gravity is not a force. The search for gravitons or gravitinos is misguided. As explained by Einstein, Gravity is an affect caused by space being curved, where the curvature is a linear combination of the curvature caused by the sum of the energy density provided by each object in the Universe. Einstein's GR equations lead ...


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We use gauge theories because they - as an experimental fact - describe the world correctly. Asking why that which we use to describe the world describes the world is not a meaningful physics question. Since hitherto gauge theories have been amazingly successful in describing fundamental interactions, we would of course look for a gauge description of a new ...



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