Lorentz Jr Posted March 11 Share Posted March 11 (edited) 1 hour ago, Phi for All said: There is no "space time fabric", for instance. Spacetime is a description of the geometry involved in the continuum of spatial and temporal dimensions. And what kind of magic wand are you waving with the "quantization beyond the standard model" part? The same kind of magic wand you physicists wave with the word "geometry". So spacetime has a geometry. So what? Lots of things have geometry. Geometry is just a mathematical description. It doesn't mean fields and gravity waves happen by magic or unicorns or leprechauns. It doesn't mean spacetime isn't implemented by something that an amateur might call a "fabric" or "ether". From Einstein's 1920 address in Leiden: Quote Recapitulating, we may say that according to the general theory of relativity space is endowed with physical qualities; in this sense, therefore, there exists an ether. According to the general theory of relativity space without ether is unthinkable; for in such space there not only would be no propagation of light, but also no possibility of existence for standards of space and time (measuring-rods and clocks), nor therefore any space-time intervals in the physical sense. But this ether may not be thought of as endowed with the quality characteristic of ponderable media, as consisting of parts which may be tracked through time. The idea of motion may not be applied to it. This is only the summary in the last paragraph. There's a fuller discussion earlier in the talk. Edited March 11 by Lorentz Jr Link to comment Share on other sites More sharing options...
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