6533b7d6fe1ef96bd1266704
RESEARCH PRODUCT
Cosmological searches for a non-cold dark matter component
Roberta DiamantiS. GariazzoMiguel EscuderoOlga Menasubject
PhysicsParticle physicsCold dark matterCosmology and Nongalactic Astrophysics (astro-ph.CO)010308 nuclear & particles physicsHot dark matterDark matterScalar field dark matterFOS: Physical sciencesLambda-CDM modelAstrophysics::Cosmology and Extragalactic Astrophysics01 natural sciences0103 physical sciencesMixed dark matterWarm dark matter010303 astronomy & astrophysicsWeak gravitational lensingAstrophysics - Cosmology and Nongalactic Astrophysicsdescription
We explore an extended cosmological scenario where the dark matter is an admixture of cold and additional non-cold species. The mass and temperature of the non-cold dark matter particles are extracted from a number of cosmological measurements. Among others, we consider tomographic weak lensing data and Milky Way dwarf satellite galaxy counts. We also study the potential of these scenarios in alleviating the existing tensions between local measurements and Cosmic Microwave Background (CMB) estimates of the $S_8$ parameter, with $S_8=\sigma_8\sqrt{\Omega_m}$, and of the Hubble constant $H_0$. In principle, a sub-dominant, non-cold dark matter particle with a mass $m_X\sim$~keV, could achieve the goals above. However, the preferred ranges for its temperature and its mass are different when extracted from weak lensing observations and from Milky Way dwarf satellite galaxy counts, since these two measurements require suppressions of the matter power spectrum at different scales. Therefore, solving simultaneously the CMB-weak lensing tensions and the small scale crisis in the standard cold dark matter picture via only one non-cold dark matter component seems to be challenging.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-08-15 |