Wessel Valkenburg, Martin Kunz, Valerio Marra
We argue that there is an intrinsic noise on measurements of the equation of state parameter w=p/rho from large-scale structure around us. The presence of the large scale structure leads to an ambiguity in the definition of the background universe and thus there is a maximal precision with which we can determine the equation of state of dark energy. To study the uncertainty due to local structure, we model density perturbations stemming from a standard inflationary power spectrum by means of the exact Lemaitre-Tolman-Bondi solution of Einstein's equation, and show that the usual distribution of matter inhomogeneities in a LCDM cosmology causes a variation of w - as inferred from distance measures - of several percent.
View original:
http://arxiv.org/abs/1302.6588
No comments:
Post a Comment