Research was undertaken as part of the Commonwealth Cosmology Initiative (CCI; http://www.thecci.org), an international collaboration supported by the Australian Research Council.
Fractal Bubble cosmology: a concordant cosmological model?★
Article first published online: 12 AUG 2009
© 2009 The Authors. Journal compilation © 2009 RAS
Monthly Notices of the Royal Astronomical Society: Letters
Volume 399, Issue 1, pages L6–L10, October 2009
How to Cite
Kwan, J., Francis, M. J. and Lewis, G. F. (2009), Fractal Bubble cosmology: a concordant cosmological model?. Monthly Notices of the Royal Astronomical Society: Letters, 399: L6–L10. doi: 10.1111/j.1745-3933.2009.00703.x
- Issue published online: 1 OCT 2009
- Article first published online: 12 AUG 2009
- Accepted 2009 June 17. Received 2009 February 22
- cosmological parameters;
- cosmology: observations;
- cosmology: theory
The Fractal Bubble model has been proposed as a viable cosmology that does not require dark energy to account for cosmic acceleration, but rather attributes its observational signature to the formation of structure. In this Letter, it is demonstrated that, in contrast to previous findings, this model is not a good fit to cosmological supernovae data; there is significant tension in the best-fitting parameters obtained from different samples, whereas Λcold dark matter (ΛCDM) is able to fit all data sets consistently. Furthermore, the concordance between galaxy-clustering scales and data from the cosmic microwave background is not achieved with the most recent supernova compilations. The validity of the Fractal Bubble formalism as a sound cosmological model is further challenged as it is shown that previous studies of this model achieve concordance by requiring a value for the present-day Hubble constant that is derived from supernovae data containing an arbitrary distance normalization.