Precision Cosmology from the Lyman-alpha Forest: Power Spectrum and Bispectrum

Details Precision Cosmology from the Lyman-alpha Forest: Power Spectrum and Bispectrum Precision Cosmology from the Lyman-alpha Forest: Power Spectrum and Bispectrum

2003-02-06

arxiv.org/abs/astro-ph/0302112v2

Mon.Not.Roy.Astron.Soc. 344 (2003) 776

Astronomy and Astrophysics

Astrophysics

14 pages, 17 figures, accepted to MNRAS; minor changes made (section 2) and references added

Scientific paper

10.1046/j.1365-8711.2003.06859.x

We investigate the promise of the Ly-alpha forest for high precision cosmology in the era of the Sloan Digital Sky Survey using low order N-point statistics. We show that with the existing data one can determine the amplitude, slope and curvature of the slope of the matter power spectrum with a few percent precision. Higher order statistics such as the bispectrum provide independent information that can confirm and improve upon the statistical precision from the power spectrum alone. The achievable precision is comparable to that from the cosmic microwave background with upcoming satellites, and complements it by measuring the power spectrum amplitude and shape at smaller scales. Since the data cover the redshift range 22.

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