The Effect of Environment on Baryon Acoustic Oscillations Standard Ruler

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Khorraminezhad, Hasti | 2016

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 49097 (04)
University: Sharif University of Technology
Department: Physics
Advisor(s): Baghram, Shant
Abstract:
Whilst often phrased in terms of accelerating expansion of the Universe and discovering the nature of the dark energy, maybe the first thing that we can think about, is measuring distances or the geometric observations. The Baryon Acoustic Oscillations (BAO) are the remaining relic of the baryon and photon decoupling epoch. These oscillations offer a powerful method of measuring cosmological distances as a standard ruler. In this thesis we first review the theoretical, observational and statistical aspects of the BAO as a statistical standard ruler and examine the impact of BAO that will have on our understanding of dark energy. Then we calculate this scale by LRGs data and constraints on cosmological parameters. Then we introduce some errors like Weak Gravitational Lensing, Redshift Space Distortions, bias and non-linearities and calculate the effect of these factors on BAO scale. Additionally we combine these effects and check that what happened on the Baryon Acoustic Oscillations scale. After that we introduce the Linear Point on the two point correlation function and estimate the effect of Weak Gravitational Lensing on this point
Keywords:
Cosmology ; Dark Energy ; Baryonic Dark Matter ; Baryons Acoustic Oscilltions ; Standard Ruler