TY - JOUR
T1 - Energy-momentum of isolated systems cannot be null
AU - Ashtekar, Abhay
AU - Horowitz, Gary T.
N1 - Funding Information:
2 Supported in part by an Alfred P. Sloan Research Fellow-ship and by the NSF contract PHY80 08154 with Syracuse University.
PY - 1982/5/10
Y1 - 1982/5/10
N2 - 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).
AB - 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).
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U2 - 10.1016/0375-9601(82)90203-1
DO - 10.1016/0375-9601(82)90203-1
M3 - Article
AN - SCOPUS:0001918310
VL - 89
SP - 181
EP - 184
JO - Physics Letters, Section A: General, Atomic and Solid State Physics
JF - Physics Letters, Section A: General, Atomic and Solid State Physics
SN - 0375-9601
IS - 4
ER -