Mathematics – Logic
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004phdt.......196o&link_type=abstract
Thesis (PhD). UNIVERSITY OF CALIFORNIA, SAN DIEGO, Source DAI-B 65/04, p. 1910, Oct 2004, 191 pages.
Mathematics
Logic
Scientific paper
Spectroscopic observations of absorption systems towards high redshift quasars provide a powerful tool for constraining the values of a variety of cosmological parameters. The measurement of the primordial D/H ratio, within the framework of standard big bang nucleosynthesis, gives a determination of the baryon density Ωbh2. A measurement of the mean flux decrement DA of the Lyα forest, when combined with sophisticated hydrodynamical simulations, provides constraints on the baryon density Ωbh 2, the amplitude of mass fluctuations σ8, and the amplitude of H I photoionizing radiation J912. This thesis presents the D/H abundance in absorption systems towards two quasars, HS 0105+1619 and Q1243+4037, which when combined with other measurements of D/H at high redshift gives a value for the baryon density of Ω bh2 = 0.0214 ± 0.002. Also presented in the thesis is the measurement of DA at a redshift of z ≃ 1.9 of DA = 0.118 ± 0.010 along with constraints on Ωbh 2, σ8, and J912 from an analysis of DA along with one of the largest cosmological simulations performed to date.
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