کیهان شناسی دقیق با استفاده از اعوجاج فضای انتقال به سرخ

The precision cosmology with redshift space distortion

علی حسین ترکمان غلامی (دانشکده فیزیک دانشگاه صنعتی شریف)

استاد راهنما: شانت باغرام

دفاع از رساله کارشناسی ارشد

به مکان و زمان نامتعارف جلسه توجه فرمایید

Abstract:  The distance measurement is the corner stone of the modern cosmology. They are measured via “Doppler Effect”, accordingly the distances in cosmology are obtained in red-shift space. Despite the cosmological background expansion, and the peculiar velocities due to the local density contrast distort these measurements. One of the main challenges in upcoming cosmological studies is to distinguish the peculiar velocity effect from the background expansion. Supernova Type Ia as standard candles can be think of a crucial observation to address the above problem. In this thesis, we study the effect of cosmological perturbations on distance-redshift relation of the SNIa. The corrective effects are from weak gravitational lensing, integrated Sachs Wolfe effect and the peculiar velocity of the SNe Ia host galaxies. Understanding these corrections will help us to disentangle the peculiar velocity effect from the background dynamic and other corrections. We conclude that by future surveys where the number of SNIa becomes larger and the precision will be improved, we will be able to find the peculiar velocity field and also the bulk flow.

یکشنبه 21 شهریور ماه 1395، ساعت 9:00

    دانشکده فیزیک، آمفی تئاتر (تالار جناب)