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APS » Journals » Phys. Rev. Lett. » Volume 61 » Issue 10
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Phys. Rev. Lett. 61, 1151–1154 (1988)

Limits on the Variability of G Using Binary-Pulsar Data

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Thibault Damour
Groupe d'Astrophysique Relativiste, Centre National de la Recherche Scientifique, Département d'Astrophysique Relativiste et de Cosmologie, Observatoire de Paris, Section de Meudon, 92195 Meudon Principal Cedex, France

Gary W. Gibbons
Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Silver Street, Cambridge, CB3 9EW, United Kingdom

Joseph H. Taylor
Joseph Henry Laboratories, Physics Department, Princeton University, Princeton, New Jersey 08544

Received 8 June 1988; published in the issue dated 5 September 1988

One of the few experimental handles on unified theories of gravity with other interactions comes from possible time variation of coupling constants over the Hubble time: H0-1≃(7.67×10-11 yr-1)-1. We present a new theory-independent estimate (consistent with zero) of the time variation of Newton's gravitational constant derived from the timing of the binary pulsar PSR 1913+16: Ġ0/G0=(1.0±2.3)×10-11 yr-1. We anticipate that this estimate will become sharper as more data are acquired.

© 1988 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.61.1151
DOI:
10.1103/PhysRevLett.61.1151
PACS:
04.80.+z, 04.50.+h, 06.20.Jr, 97.60.Gb
 
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