In general relativity energy is needed to curve spacetime but this energy cannot be localised. The argument is very simple (See Misner, Thorne and Wheeler 1970) and is as follows: - Einstein’s equivalence principle plays a pivotal role in general relativity. It says that one can always find a frame in which all local gravitational fields disappear. If there are no local gravitational fields, there can be no local gravitational energy, but this does not mean that there is no gravitational energy, it just means that it cannot be localised. ... The similarity between the non-local gravitational energy and the non-local correlation energy involved in the Einstein-Podolsky-Rosen effect has already been noted by Penrose (1996). He has tried to make use of this common feature to provide an alternative way of solving the measurement problem.
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