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The dearth of halo dwarf galaxies: is there power on short scales?
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The dearth of halo dwarf galaxies: is there power on short scales?
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N-body simulations of structure formation with scale-invariant primordial perturbations show significantly more virialized objects of dwarf-galaxy mass in a typical galactic halo than are observed around the Milky Way. We show that the dearth of observed dwarf galaxies could be explained by a dramatic downturn in the power spectrum at small distance scales. This suppression of small-scale power might also help mitigate the disagreement between cuspy simulated halos and smooth observed halos, while remaining consistent with Lyman-alpha-forest constraints on small-scale power. Such a spectrum could arise in inflationary models with broken scale invariance.
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Cited by 1 Pith paper
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A lower bound on primordial power spectrum from halo substructure
Galactic halo substructure requires primordial curvature perturbations of amplitude ≳10^-9 at wavenumbers 10–30 Mpc^-1.
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