2004/07/09 by Mike Chu, Lloyd Knox · 16 citations
Physics and Astronomy · #Advanced Mathematical Theories and Applications #Baryon #Cosmological constant #Cosmological model #Cosmology #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Ionization #Observable #astro-ph
paper · pdf · doi:10.1086/427064
published in The Astrophysical Journal 620(1), 1-6 (IOP Publishing) · 5 pages, submitted to ApJ
arxiv created 2004/07/09 · openalex publication_date 2005/02/09 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Cosmological parameters affect observables in physically distinct ways. For example, the baryon density ω b affects the ionization history and also the pressure of the pre-recombination fluid. To investigate the relative importance of different physical effects to the determination of ω b and to test the cosmological model, we artificially split ω b into two "metaparameters": ω be , which controls the ionization history, and ω bp , which plays the role of ω b for everything else. In our demonstration of the technique we find ω b = 0.0229 ± 0.0012 (with no parameter splitting), ω bp = 0.0238 ± 0.0021, ω be = 0.0150 ± 0.0034, and ω bp - ω be = 0.0088 ± 0.0039.