Abstract
It is shown that neither the ADM nor the Bondi four-momentum of an isolated system in general relativity can be null. This strengthens recent results on positivity of energy by showing that the total four-moemtum must be strictly timelike (and future directed).
| Original language | English (US) |
|---|---|
| Pages (from-to) | 181-184 |
| Number of pages | 4 |
| Journal | Physics Letters A |
| Volume | 89 |
| Issue number | 4 |
| DOIs | |
| State | Published - May 10 1982 |
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
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Cite this
Ashtekar, A., & Horowitz, G. T. (1982). Energy-momentum of isolated systems cannot be null. Physics Letters A, 89(4), 181-184. https://doi.org/10.1016/0375-9601(82)90203-1