Now showing items 1-4 of 4

    • Menestrina, Justin (Vanderbilt University. Dept. of Physics and Astronomy, 2012-04)
      Cosmic microwave background (CMB) observations suggest the possibility of an extra dark radiation component, while the current evidence from big bang nucleosynthesis (BBN) is more ambiguous. Dark radiation from a decaying ...
    • Robbins, Katherine (Vanderbilt University. Dept. of Physics and Astronomy, 2010-04)
    • Norris, Jackson M. (Vanderbilt University. Dept. of Physics and Astronomy, 2008-04-20)
      We use projected number density profiles of galaxy groups to investigate the relationship between galaxy group structure and dark matter structure within halos. We primarily study a specific model of how galaxies populate ...
    • Swaney, Jeffrey (Vanderbilt University. Department of Physics and Astronomy, 2014-04)
      We examine models of quintessence in which a minimally-coupled scalar field phi evolves near a local extremum of its potential V ( phi) at phi_*. Assuming that (1/V )(dV/dphi) is small and w ~ -1, we Taylor expand the ...