Parisa Arabameri

Department of Physics, Shahid Beheshti University

k−Dependent Dark Matter 

Abstract: With the emersion of precise cosmology and the emergence of cosmic tensions, we are faced with the question of whether the simple model of Cold Dark Matter needs to be extended and whether doing so can alleviate the tensions and improve our understanding of the properties of dark matter. In this talk, first, I will briefly review Cold Dark Matter challenges, and Warm and Mixed Dark Matter models as solutions to some of these challenges. Then, I will introduce a new model that examines whether Dark Matter has any scale-dependent behavior. This model is one of the generalized models of dark matter with the non-zero equation of state (w) so that the behavior of this dark matter changes according to the scale of (k). In large scales (small (k)’s), the dark matter is cold (w = 0), while it becomes warm (w \neq 0) for small scales (large k’s). This behavior is modeled phenomenologically for two different cases:(I) the sound speed behaves independently of (k) as a constant parameter and (II) it changes depending on (k).

یکشنبه 5 آذر 1402، ساعت 17:15

Sunday 26 November 2023 – 17:15 Tehran Time

Hybrid Seminar

دانشکده فیزیک – طبقه اول – کلاس فیزیک 3/ Physics Department – first floor – Room Physics 3   

https://vc.sharif.edu/ch/cosmology

گزینه ورود به صورت مهمان – Enter as a Guest