Describing Non-Linearities

فرشاد کمالی نژاد (دانشکده فیزیک دانشگاه صنعتی شریف )

 Abstract: Large scale structure surveys are the major probes of cosmology in the next decade. Understanding the formation of structures in an expanding universe is the key to solve many open problems in cosmology. Linear perturbation theory is successful to explain the temperature fluctuations of the CMB when the perturbations are small. These fluctuations grow larger, perturbation theory at linear order breaks and the effects of nonlinearities become dominant. These nonlinearities are well described by applying the standard perturbation theory. In this talk, I study the effects of nonlinear growth of structure on the total matter power spectrum, and in the end, I prove that we can define a “linear point” which is robust against these nonlinear effects.

 یکشنبه 22 مهر 1397، ساعت 15:00

دانشکده فیزیک، طبقه اول کلاس فیزیک 3