Energy-momentum of isolated systems cannot be null

Abhay Ashtekar; Gary T. Horowitz

doi:10.1016/0375-9601(82)90203-1

Energy-momentum of isolated systems cannot be null

Abhay Ashtekar, Gary T. Horowitz

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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	https://doi.org/10.1016/0375-9601(82)90203-1
State	Published - May 10 1982

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1016/0375-9601(82)90203-1

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title = "Energy-momentum of isolated systems cannot be null",

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).",

author = "Abhay Ashtekar and Horowitz, {Gary T.}",

note = "Funding Information: 2 Supported in part by an Alfred P. Sloan Research Fellow-ship and by the NSF contract PHY80 08154 with Syracuse University.",

year = "1982",

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doi = "10.1016/0375-9601(82)90203-1",

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volume = "89",

pages = "181--184",

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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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DO - 10.1016/0375-9601(82)90203-1

M3 - Article

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VL - 89

SP - 181

EP - 184

JO - Physics Letters A

JF - Physics Letters A

IS - 4

ER -

Energy-momentum of isolated systems cannot be null

Abstract

All Science Journal Classification (ASJC) codes

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