Mapping the dark energy with varying alpha

Parkinson, D., Bassett, B. A. and Barrow, J. D. (2004) Mapping the dark energy with varying alpha. Physics Letters B, 578 3-4: 235-240. doi:10.1016/j.physletb.2003.10.081


Author Parkinson, D.
Bassett, B. A.
Barrow, J. D.
Title Mapping the dark energy with varying alpha
Journal name Physics Letters B   Check publisher's open access policy
ISSN 0370-2693
1873-2445
Publication date 2004-01
Sub-type Article (original research)
DOI 10.1016/j.physletb.2003.10.081
Open Access Status DOI
Volume 578
Issue 3-4
Start page 235
End page 240
Total pages 6
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Abstract Cosmological dark energy is a natural source of variation of the fine structure constant. Using a model-independent approach we show that once general assumptions about the alpha-varying interactions are made, astronomical probes of its variation constrain the dark-energy equation of state today to satisfy -1 < wf < -0.96 at 3-sigma and significantly disfavour late-time changes in the equation of state. We show how dark-energy-induced spatial perturbations of alpha are linked to violations of the equivalence principle and are thus negligible at low-redshift, in stark contrast to the BSBM theories. This provides a new test of dark energy as the source of alpha variation.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
 
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Created: Mon, 28 Feb 2011, 09:46:34 EST