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A Clash of Clusters Provides New Clue to Dark Matter
Special ACKS Seminar: Dragan Huterer
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Cosmology Seminar: Neal Dalal (CITA)
| What | seminar cosmology |
|---|---|
| When |
10 March 08 from 11:00 am to 12:00 pm |
| Where | Varian Room 355 |
| Contact Name | Laura Duato |
| Contact Email | lduato@stanford.edu |
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Halo Assembly Bias in Hierarchical Structure Formation
I will discuss the origin of halo assembly bias, the dependence of halo clustering on assembly history. I will argue that assembly bias in dark matter halos may be understood in fairly simple terms. At high masses, the assembly bias observed in N-body simulations can be explained quantitatively by noting that massive halos in high-density environments have a larger mass supply and therefore grow more quickly than similar halos in low-density environments. At low masses, assembly bias appears driven by the cessation of mass accretion onto a sub-population of small halos. The old, low mass halos naturally tend to become unbiased, and hence more strongly clustered than their anti-biased peers.
MASS: Lance Simms