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
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 ..View full abstract
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.