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Astrophysics, Gravitation and Cosmology Seminar - "Probing the nature of dark matter with the CMB"

Event Type
Seminar/Symposium
Sponsor
Department of Physics
Location
464 Loomis Lab
Date
Dec 5, 2018   12:00 pm  
Speaker
Yacine Ali-Haimoud, New York University
Contact
Betsy Greifenkamp
E-Mail
greifenk@illinois.edu
Views
37
Originating Calendar
Physics - Astrophysics, Gravitation, and Cosmology Seminar

After decades of searches, the nature of dark matter (DM) remains an unsolved problem. This forces us to look at existing models from new angles, and to explore (or re-explore) DM candidates beyond the standard WIMP. In this talk, I will focus on what one can learn from the cosmic microwave background (CMB) frequency spectrum and anisotropies. After briefly reviewing CMB physics, I will first describe how the CMB can test DM-baryon scattering. I will outline a recently developed Boltzmann-Fokker-Planck formalism, which allows to account for finite DM self-interactions in addition to scattering with baryons. In the second part of the talk, I will discuss an old DM candidate brought back to the front page by LIGO: primordial black holes (PBHs). I will describe the simple accretion model underlying CMB bounds to PBHs. I will discuss some of the possible improvements to this calculation, hoping to stimulate feedback and suggestions from the experts in the room!

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