بررسی اثر محیط بر روی طول مشخصه نوسانات آکوستیکی باریون ها

The Effect of Environment on Baryon Acoustic Oscillations (BAO)

هستی خرمی نژاد (دانشکده فیزیک دانشگاه صنعتی شریف)

استاد راهنما: شانت باغرام

دفاع از رساله کارشناسی ارشد

Abstract:   Whilst often phrased in terms of accelerating expansion of the Universe or 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. And 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 BAO will have on our understanding of dark energy. Then we calculate this scale by LRGs data and constraints on cosmological parameters. Then we introduce the error factors 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.

یکشنبه 7 شهریور ماه 1395، ساعت 10:00

    دانشکده فیزیک، تالار پرتوی – 412