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Large Scale Structure with SDSS-III/BOSS

Mariana Vargas-Magaña 1 
1 APC - Cosmologie
APC (UMR_7164) - AstroParticule et Cosmologie
Abstract : My research focuses on the extraction of the signal imprinted by the BAO on the galaxy distribution. The BAO feature is a bump at ∼ 150Mpc in the two-points correlation function of the matter in the Universe. This corresponds to maximum distance travelled by acoustic waves in the matter-radiation fuid during the period from matter/radiation equality to their decoupling at z ∼1100. An excess density at a radius of 150 Mpc was left after decoupling around each dark-matter density peak. The final goal of my work is to perform a complete analysis of the data available up to summer 2011 in SDSS III/BOSS in order to give constraints on isotropised distance DV and constraint the dark energy equation of state parameters w0 and wa . With such observations, one wants to check if the data is consistent with the so-called cosmological constant (corresponding to w0 =1 and wa = 0) or if the dark energy equation of state shows a time evolution (wa ̸= 0) pointing to more complex dark energy scenarios. I studied and tested data analysis tools with log normal simulations and the public DR7 to achieve this goal. I studied the redshift distortions with simulations in the linear regime and I developed a optimization method for the correlation function estimator. The second part of my my work was focused in the analysis of BOSS data.There are to main programs in the SDSS III/BOSS pro ject: the Luminous Red Galaxies catalogue anda new technique based on quasars using the Lyman-alpha forest. I have focused my research on the LRG science. I performed a complete analysis of BOSS-CMASS sample from catalog construction, systematic corrections and cosmological constrains.
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https://tel.archives-ouvertes.fr/tel-00726113
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Submitted on : Wednesday, August 29, 2012 - 3:24:21 PM
Last modification on : Thursday, November 18, 2021 - 3:57:15 AM
Long-term archiving on: : Friday, November 30, 2012 - 2:45:13 AM

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  • HAL Id : tel-00726113, version 1

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Mariana Vargas-Magaña. Large Scale Structure with SDSS-III/BOSS. Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]. Université Paris-Diderot - Paris VII, 2012. English. ⟨tel-00726113⟩

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