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)