CfA Colloquium Schedule Spring 2013
 
 2 May 2013

2 May 2013

Speaker: pH lecture: Matthew Walker (CfA)

Title:Galactic Dynamics and the Nature of Dark Matter

Abstract: The motions of stars can tell us about the nature of particles. I will translate the stellar kinematics observed in the nearest, smallest and `darkest' galaxies into a test of the standard hypothesis that dark matter consists of `cold' and `collisionless' (i.e., weakly interacting) particles. The feasibility of this simple model now seems to require that baryon-driven processes (e.g., energetic feedback from supernova explosions) alter the internal structure of galactic dark matter halos systematically with respect to predictions derived from cosmological N-body simulations. I will identify future work that can tell definitively whether such reconciliation is energetically feasible or whether the dark matter model ultimately requires additional complexity.

Video of the Presentation (Talks can be viewed with RealPlayer. Free download is available from www.real.com )

 
 

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