Testing cosmological models and understanding cosmological parameter determinations with metaparameters

Details Testing cosmological models and understanding cosmological parameter determinations with metaparameters Testing cosmological models and understanding cosmological parameter determinations with metaparameters

2004-07-09

arxiv.org/abs/astro-ph/0407198v1

Astrophys.J. 620 (2005) 1-6

Astronomy and Astrophysics

Astrophysics

5 pages, submitted to ApJ

Scientific paper

10.1086/427064

Cosmological parameters affect observables in physically distinct ways. For example, the baryon density, omega_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 omega_b, and to test the cosmological model, we artificially split omega_b into two `metaparameters': omega_{be} which controls the ionization history and omega_{bp} which plays the role of omega_b for everything else. In our demonstration of the technique we find omega_b = .0229 +/- .0012 (with no parameter splitting), omega_{bp} = .0238 +/- .0021, omega_{be}= .0150 +/- .0034 and omega_{bp}-omega_{be} = .0088 +/- .0039.

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