Cosmic Complementarity: H_0 and Omega_m from Combining CMB Experiments and Redshift Surveys

Details Cosmic Complementarity: H_0 and Omega_m from Combining CMB Experiments and Redshift Surveys Cosmic Complementarity: H_0 and Omega_m from Combining CMB Experiments and Redshift Surveys

1998-05-19

arxiv.org/abs/astro-ph/9805239v1

Astrophys.J.504:L57-L61,1998

Astronomy and Astrophysics

Astrophysics

4 pages, LaTeX, 2 Postscript figures; submitted to ApJ Letters

Scientific paper

We show that upcoming CMB satellite experiments and large redshift surveys can be used together to yield 5% determinations of H_0 and Omega_m, an order of magnitude improvement over CMB data alone. CMB anisotropies provide the sound horizon at recombination as a standard ruler. For reasonable baryon fractions, this scale is imprinted on the galaxy power spectrum as a series of spectral features. Measuring these features in redshift space determines the Hubble constant, which in turn yields Omega_m once combined with CMB data. Since the oscillations in both power spectra are frozen in at recombination, this test is insensitive to low-redshift cosmology.

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