PhysRevLett.84.4525.pdf (80.95 kB)
The dearth of halo dwarf galaxies: is there power on short scales?
journal contributionposted on 2023-06-08, 07:53 authored by Marc Kamionkowski, Andrew R Liddle
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.
- Published version
JournalPhysical Review Letters
PublisherPhysical Review Letters
Department affiliated with
- Physics and Astronomy Publications
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