School of Physics - Theses

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    Dark matter halos in the early Universe
    Angel, Paul ( 2016)
    We use high resolution N-Body simulations to study the properties of dark matter halos during the Epoch of Reionization. The halo concentration and spin parameters are measured in the mass range 10^8Msun/ h < M < 10^11M sun/h and redshifts 55 concentration-mass (c(M)) relation that is almost flat and well described by a simple power-law for both NFW and Einasto fits. The equilibrium state of the halo has a significant effect on the resulting concentrations. We also measure the spin distribution and spin mass relation, which has a weak dependence on equilibrium state. The spin virial mass relation has a mild negative correlation at high redshift. The correlation between the local density (the environment) of a halo and its formation history is examined. There is very little correlation between the formation time of a halo with local density, but some correlation between environment and the number of mergers the halo has experienced since formation.