Kavli Affiliate: Andrey Kravtsov
| First 5 Authors: Ariane Dekker, Andrey Kravtsov, , ,
| Summary:
Although the standard $Lambda$+Cold Dark Matter ($Lambda$CDM) model is well
tested on large scales, the primordial power spectrum may deviate from the
$Lambda$CDM spectrum on small scales due to specific dark matter properties or
alternative inflationary models. These deviations affect the formation of dark
matter structure, which subsequently leads to different observable properties
of galaxies. In this work, we study the impact of a blue and red tilted power
spectrum on the central density of dwarf galaxies. To do this, we model
densities of dwarf galaxies using a combination of high-resolution numerical
simulations and galaxy formation model. The model galaxies in $Lambda$CDM are
consistent with observations of 41 faint dwarf satellite galaxies of the Milky
Way. The deviations from the $Lambda$CDM power spectrum are constrained by the
central matter densities of dwarf galaxies, which set stringent constraints on
the possible small-scale tilt of the primordial power spectrum, improving on
the current limits. Moreover, similar analysis can be applied to test any
feature in the power spectrum at small scales between $ksim
10-100$~Mpc$^{-1}$.
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