گروه کیهان‌شناسی

Testing MOG theory and CDM model at galactic and cosmic scales using observational data

Zahra Davari

Physics Department Sharif University of Technology

Abstract: In this talk, I will discuss one of the alternative theories to dark matter named MOdified Gravity (MOG) on both the galactic and cosmic scales.

 In the first part, I have investigated MOG theory and dark matter model by testing their ability to describe the local dynamics of the Milky Way in vertical and transverse directions by using observation data such as the vertical dispersion, rotation curve, surface density, and number density of stars.
The results show that two models of MOG and CDM are able to describe equally well the rotation curve and the vertical dynamics of stars in the local MW.
In the second part, I characterize the main aspects of the MOG theory at cosmological scales, analyzing the Friedmann equations and the expressions of the scalar fields of the theory. I use data from the binned Pantheon SNIa dataset,  Cosmic Chronometers (CC), and Big Bang Nucleosynthesis to test MOG predictions and comparing to the LCDM model.

یکشنبه 16 شهریور 1399، ساعت 19:00

Sunday 6 September 2020 – 19:00 Tehran Time

اتاق سمینار مجازی –Virtual Seminar Room

https://vclass.ecourse.sharif.edu/ch/cosmology

گزینه ورود به صورت مهمان – Enter as a Guest