Recovery of the Shape of the Mass Power Spectrum from the Lyα Forest

We propose a method for recovering the shape of the mass power spectrum onlarge scales from the transmission fluctuations of the Lyman-alpha forest,which takes into account directly redshift-space distortions. The procedure, indiscretized form, involves the inversion of a triangular matrix which projectsthe mass power spectrum in 3-D real-space to the transmission power spectrum in1-D redshift-space. We illustrate the method by performing a linear calculationrelating the two. A method that does not take into account redshift-spaceanisotropy tends to underestimate the steepness of the mass power spectrum, inthe case of linear distortions. The issue of the effective bias-factor for thelinear distortion kernel is discussed.Comment: 18 pages, 4 figures; minor revision