Inferring the Linear Power Spectrum from the Lyman-alpha Forest

Details Inferring the Linear Power Spectrum from the Lyman-alpha Forest Inferring the Linear Power Spectrum from the Lyman-alpha Forest

2001-11-13

arxiv.org/abs/astro-ph/0111230v2

Astrophys.J. 590 (2003) 1-7

Astronomy and Astrophysics

Astrophysics

8 pages, 5 figures

Scientific paper

10.1086/374407

We discuss the determination of the linear power spectrum of dark matter fluctuations from measurements of the transmitted flux Ly-alpha Forest power spectrum. We show that at most scales probed by current measurements, the flux power spectrum is significantly affected by non-linear corrections to the linear dark matter power spectrum due to gravitational clustering. Inferring the linear dark matter power spectrum shape is therefore difficult due to non-linear corrections driving the non-linear power spectrum to a k^{-1.4} shape nearly independent of initial conditions. We argue that some methods used in previous estimates underestimate the uncertainties in the shape of the linear dark matter power spectrum.

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