"Explaining the Diverse Rotation Curves of Spiral Galaxies," by Hai-Bo Yu (UC Riverside)

Monday, May 22, 2017 - 3:00pm to 4:00pm
TEPAPP Seminars

Theory of Elementary Particles, Astroparticle Physics, and Phenomenology (TEPAPP) Seminar

Physics & Astronomy Building (PAB) Room 4-708
Monday, May 22, 2017

Guest Speaker: Hai-Bo Yu (UC Riverside)​

Talk Title: "Explaining the Diverse Rotation Curves of Spiral Galaxies"


The rotation curves of spiral galaxies exhibit a diversity that has been difficult to understand in the cold dark matter (CDM) paradigm. In this talk, I will show that the self-interacting dark matter (SIDM) model provides excellent fits to the rotation curves of a sample of galaxies with asymptotic velocities in the 25 to 300 km/s range that exemplify the full range of diversity. We only assume the halo concentration-mass relation predicted by the CDM model and a fixed value of the self-interaction cross section. The impact of the baryons on the SIDM halo profile and the scatter from the assembly history of halos as encoded in the concentration-mass relation can explain the diverse rotation curves of spiral galaxies. I will also discuss other smoking-gun signatures of SIDM in astrophysical observations.

Event Attachments: 
4-708 PAB