Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

In what sense can it be said that spacetime possesses momentum? Can an experiment be envisaged to test this question?

share|cite|improve this question

In the case of an asymptotically flat spacetime (basically, one in which all of the matter is confined to a finite area of the spacetime), there is a quantity called the ADM Momentum that will tell you the total momentum contained in the spacetime, factoring both the matter and a contribution "from the geometry". There are other schemes that let you do stuff like this if you have a timelike or null killing vector defined on a timelike or null 3-d surface. Then, you can talk about the momentum (and energy) contained "within" this surface. There is a review article on the topic here

share|cite|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.