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March 6 at 4PM in the 2nd Floor Conference Room in Dearborn Speaker: Steffen Knollmann (AIP) “Dark matter halo profiles in scale-free cosmologies” I will discuss the dependence of the central logarithmic slope of dark matter halo density profiles α on the spectral index n of the linear matter power spectrum P(k). This dependence is investigated in scale-free (i.e. P(k) ∝ kn) cosmological N-body simulations. A sample of well resolved haloes in dynamical equilibrium is identified and their mass profiles are analysed. A generalised Navarro, Frenk & White profile, which allows the central slope α to vary, is used to obtain a preferred central slope for haloes in the different models. I will show that the so deduced central slope depends on the spectral index of the scale-free model in the sense that α becomes shallower as n becomes steeper. However, when normalising the density profiles by r-2, the radius at which the logarithmic slope of the density profiles is -2, and comparing the radial dependence of the maximum slope γ, which gives an upper limit on the slope the density profile within r can have, the haloes from different models are indistinguishable. This behaviour will be traced back to the different concentrations, defined as rvir/r-2 of the haloes in different models. |