Partially Acoustic Dark Matter Cosmology and Cosmological Constraints
  Observations of the cosmic microwave background (CMB) together with weak
lensing measurements of the clustering of large scale cosmological structures
and local measurements of the Hubble constant pose a challenge to the standard
$\Lambda$CDM cosmological model. On one side CMB observations imply a Hubble
constant that is lower than local measurements and an amplitude of the lensing
signal that is higher than direct measurements from weak lensing surveys. We
investigate a way of relieving these tensions by adding dark radiation tightly
coupled to an acoustic part of the dark matter sector and compare it to massive
neutrino solutions. While these models offer a way of separately relieving the
Hubble and weak lensing tensions they are prevented from fully accommodating
both at the same time since the CMB requires additional cold dark matter when
adding acoustic dark matter or massive neutrinos to preserve the same sharpness
of the acoustic peaks which counteracts the desired growth suppression.
