سمینار هفتگی گروه کیهانشناسی

Cosmological Filaments in the Light of Excursion Set of Saddle Points

سینا تاملی (دانشکده فیزیک دانشگاه صنعتی شریف )

Abstract: Filaments are one of the components of the cosmic web which can be seen in observations and simulations. They are also considered as a potential solution to missing baryon problem as the host of the baryons which does not reside in dark matter halos. The statistics of the filament could also be used as a probe for cosmology. To benefit from these applications, we need a precise definition for the filaments. There are some models, proposed by the community in order to explain these objects. In this work, we provide a route to find out the statistics of the filaments, regarding them as the saddle points of the density field, through the excursion set approach and ellipsoidal collapse model.  In this presentation, I am going to provide an introduction to Excursion Set of Peaks and saddle points, ellipsoidal collapse model, and the prediction of this framework about the length, number density and mass fraction of the filaments.

یکشنبه ۲۷ آبان ۱۳۹۷، ساعت ۱۵:۰۰

دانشکده فیزیک، طبقه اول کلاس فیزیک ۳

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