Precise measurement of the matter power spectrum amplitude and the background radiation amplitude

Details Precise measurement of the matter power spectrum amplitude and the background radiation amplitude Precise measurement of the matter power spectrum amplitude and the background radiation amplitude

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004phdt.........5j&link_type=abstract

Thesis (PhD). UNIVERSITY OF CALIFORNIA, SAN DIEGO, Source DAI-B 65/03, p. 1365, Sep 2004, 82 pages.

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Scientific paper

We investigate the one dimensional flux power spectrum of the Lymanα forest and compare it with Lymanα forest simulations using state of the art hydrodynamical simulations. We investigate how properties of the forest, such as the mean flux , b parameter distribution (specifically, the mode of the b parameter distribution, bmode) and flux power amplitude [P], depend on cosmological and astrophysical parameters such as σ8, the background UV radiation amplitude J, and the Helium reheating rate Jhe. We present our results of scaling relationships between the cosmological and astrophysical variables, J, σ8, Jhe, and observable astrophysical values, , [P], bmode. These scaling relations are used to determine the best fit values of the cosmological parameters; J = 1.1, σ8 = 0.93 and Jhe = 2.6. These values are remarkably close to the best fit values found by using WMAP data.

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