Mapping the Dark Energy with Varying Alpha
Astrophysics
2015-06-24 v1 General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
High Energy Physics - Theory
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 < w_f < -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.
Cite
@article{arxiv.astro-ph/0307227,
title = {Mapping the Dark Energy with Varying Alpha},
author = {David Parkinson and Bruce A. Bassett and John D. Barrow},
journal= {arXiv preprint arXiv:astro-ph/0307227},
year = {2015}
}
Comments
5 pages, 4 colour eps figures