Hamed Manouchehri Kousha

Department of Physics, Sharif University of Technology

The Effective Field Theory of Large-Scale Structures  of a Fuzzy Dark Matter Universe

Abstract: Ultra-light scalar fields and their non-interacting class, the so-called fuzzy dark matter (FDM), are candidates for dark matter, introduced to solve the small-scale problems of the standard cold dark matter. In this talk, after reviewing FDM and its main effects, I address whether the small-scale effects of FDM, specifically the quantum pressure, could leave sizable imprints on the large-scale statistics of the matter. For this purpose, we utilized the effective field theory of large-scale structures wherein small-scale physics is integrated and represented on large scales by only a set of free parameters. These parameters can be determined by fitting to the cosmological simulations. We performed three FDM simulations with different masses and compared their sound speed with the standard cold dark matter (CDM) simulation. We found that the FDM sound speed is slightly higher than CDM’s. We conclude that the impact of the FDM is not limited to the small scales alone, and we can search for them by studying the matter on large scales. Though it is beyond the observations’ scope today, it is possible to discriminate it with upcoming observations.

 

 

یکشنبه 10 دی 1402، ساعت 17:15

Sunday 31 December 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