Precise Cosmology with Redshift Space Distortion and Calculating Pecular Velocity of SNe type Ia

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Torkaman Gholami, Ali Hossein | 2016

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 49099 (04)
University: Sharif University of Technology
Department: Physics
Advisor(s): Baghram, Shant
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, 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 fnd the peculiar velocity feld and also the bulk ﬂow
Keywords:
Cosmology ; Red Shift ; Type Ia Suppernovae ; Precise Cosmology ; Red Shift Space Distortion ; Peculiar Velocity