Eh
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It's just something that comes out of GR. Any notion of distance is defined as a property of the field, and so it follows that if the theory is true, then space may have no independent existence. This is not proof, as it is possible that the gravitational field does sit on a backdrop of some absolute space, somewhat like icing on a cake. But this backdrop of space is completely redundant. If everything can be defined in terms of the field, the simplest explanation is that space and the field are inseperable.
But the debate over whether space has independent existence has a long history. Modern physics seems to support Descartes notion that space only exists if there is something present in it.
But the debate over whether space has independent existence has a long history. Modern physics seems to support Descartes notion that space only exists if there is something present in it.