Research undertaken as part of the Commonwealth Cosmology Initiative (CCI: http://www.thecci.org), an international collaboration supported by the Australian Research Council.
How does the Hubble sphere limit our view of the Universe?★
Article first published online: 25 APR 2012
© 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS
Monthly Notices of the Royal Astronomical Society: Letters
Volume 423, Issue 1, pages L26–L29, June 2012
How to Cite
Lewis, G. F. and van Oirschot, P. (2012), How does the Hubble sphere limit our view of the Universe?★. Monthly Notices of the Royal Astronomical Society: Letters, 423: L26–L29. doi: 10.1111/j.1745-3933.2012.01249.x
- Issue published online: 4 JUN 2012
- Article first published online: 25 APR 2012
- Accepted 2012 February 29. Received 2012 February 21; in original form 2012 January 19
- cosmology: theory
It has recently been claimed that the Hubble sphere represents a previously unknown limit to our view of the universe, with light we detect today coming from a proper distance less than this ‘cosmic horizon’ at the present time. By considering the paths of light rays in several cosmologies, we show that this claim is not generally true. In particular, in cosmologies dominated by phantom energy (with an equation of state of ω < −1) the proper distance to the Hubble sphere decreases, and light rays can cross it more than once in both directions; such behaviour further diminishes the claim that the Hubble sphere is a fundamental, but unrecognized, horizon in the universe.