# About the non-locality of gravitational energy 2

Gravitational energy is non-local which is essentially because of the equivalence principle. The equivalence principle says that you can always transform your frame so that you feel like in a Minkowski space-time locally. Mathematically, there is no tensor-like definition for gravitational energy in General Relativity. All energy-momentum tensor for gravitational energy must be pseudo-tensor, namely frame-dependent tensor. About the non-locality of gravitational energy I have a question:

How can the non-locality of gravitational energy be implemented in String theory where, for example, gravitons are simply zero modes of closed strings and strings are explicitly local (of course except for the resolution of strings which, as I see, is different from the non-locality of gravitational energy)?

• This seems like a re-post of physics.stackexchange.com/q/240793. Mar 3, 2016 at 9:09
• @CuriousOne, Qmechanic removed my second question there since there should be only one question for one post. Mar 3, 2016 at 9:11
• That explains why I had the feeling to have seen the entire question before. I don't think you need the introduction part, to begin with. We know that gravitational energy is non-local. Mar 3, 2016 at 9:16
• Except that it doesn't have anything to do with the question. If string theory describes gravity correctly, at least in the weak field limit, then the answer is trivial. If it doesn't do even that... then who needs string theory? I am not quite sure what you mean by "implementation" to begin with. Are you saying that this has to be forced into string theory because it's not naturally in there, already? Mar 3, 2016 at 9:22
• You can experimentally localize the energy in the field of a point charge? Mar 3, 2016 at 9:43