Journal article

Constraining a Possible Variation of G with Type Ia Supernovae

Jeremy Mould, Syed A Uddin

Publications of the Astronomical Society of Australia | CAMBRIDGE UNIV PRESS | Published : 2014

Abstract

Astrophysical cosmology constrains the variation of Newton's Constant in a manner complementary to laboratory experiments, such as the celebrated lunar laser ranging campaign. Supernova cosmology is an example of the former and has attained campaign status, following planning by a Dark Energy Task Force in 2005. In this paper, we employ the full SNIa data set to the end of 2013 to set a limit on G variation. In our approach, we adopt the standard candle delineation of the redshift distance relation. We set an upper limit on its rate of change |̇G/G| of 0.1 parts per billion per year over 9 Gyrs. By contrast, lunar laser ranging tests variation of G over the last few decades. Conversely, one ..

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University of Melbourne Researchers

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Funding Acknowledgements

The authors are grateful to Chris Blake and Michael Murphy for helpful advice and to an anonymous referee for emphasising the issue of the quantum of <SUP>56</SUP>Ni. CAASTRO is the ARC's Centre of Excellence for All-Sky Astrophysics, funded by grant CE11001020.