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Add to Calendar 12/5/2018 12:00 pm 12/5/2018 America/Chicago Astrophysics, Gravitation and Cosmology Seminar - "Probing the nature of dark matter with the CMB" DESCRIPTION:

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!

\n\nSPEAKER:

Yacine Ali-Haimoud, New York University

464 Loomis Lab

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

Speaker Yacine Ali-Haimoud, New York University
Date: 12/5/2018
Time: 12 p.m.
Location:

464 Loomis Lab

Event Contact: Betsy Greifenkamp
greifenk@illinois.edu
Sponsor:

Department of Physics

Event Type: Seminar/Symposium
 

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!

To request disability-related accommodations for this event, please contact the person listed above, or the unit hosting the event.

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