Dina Mousavi

Department of Physics, Sharif University of Technology

Nonlinear Structure Formation in Beyond Cold Dark Matter Models with Nonzero Sound Speed

Supervisor: Shant Baghram

Abstract: The cold dark matter (CDM) paradigm has been successful in explaining large-scale structure formation in the universe, yet it faces significant challenges on length scales smaller than 1 Mpc and mass scales smaller than 10^11 M_sun. So the search for alternative models is ongoing. In this work, we investigate a novel dark matter model based on the dark gravitons in the Dark Dimension scenario, inspired by the Swampland program. We begin by discussing the theoretical underpinnings of the Dark Dimension scenario and how it modifies the properties of dark matter. We then calculate the growth function of matter perturbations in the linear regime, establishing the groundwork for understanding the evolution of density fluctuations. Using the growth functions, We calculate the matter power spectrum in this model. Extending our analysis to the nonlinear regime, we employ excursion set theory to determine the number density of dark matter halos. By analyzing the resulting halo mass function within this dark dimension framework, we evaluate its impact on the missing satellite problem. We also calculate how this model modifies dark matter halo bias.

یکشنبه 18 شهریور 1403، ساعت 10:00

Sunday 8 September – 10:00 Tehran Time

دانشکده فیزیک – طبقه پنجم – کلاس 512 Physics Department fifth floor – Room 512  /