Small-Scale Challenges to the Λ CDM Paradigm
University of California, Irvine · The University of Texas at Austin
Abstract
The dark energy plus cold dark matter (ΛCDM) cosmological model has been a demonstrably successful framework for predicting and explaining the large-scale structure of the Universe and its evolution with time. Yet on length scales smaller than ∼1 Mpc and mass scales smaller than ∼10 11 M ⊙ , the theory faces a number of challenges. For example, the observed cores of many dark matter–dominated galaxies are both less dense and less cuspy than naïvely predicted in ΛCDM. The number of small galaxies and dwarf satellites in the Local Group is also far below the predicted count of low-mass dark matter halos and subhalos within similar volumes. These issues underlie the most well-documented problems with ΛCDM:…
Citation impact
- FWCI
- 72.77
- Percentile
- 100%
- References
- 314
Authors
2Topics & keywords
- Physics
- Astrophysics
- Cold dark matter
- Dark matter
- Dwarf galaxy problem
- Cuspy halo problem
- Local Group
- Dark matter halo
Funding
- NSNational Science FoundationAwards: 1517226, 1518291, HST-AR-13888, AST-1518291, OCI-1053575, 1053575, AST-1517226, HST-AR-14282
- NANational Aeronautics and Space AdministrationAwards: OCI-1053575, HST-AR-14282, AR-14282, AR-13896, HST-AR-13896, HST-AR-12836, ACI-1053575, NAS5-26555, HST-AR-13888, AR-13921, AR-12836, AR-13888
- UOUniversity of Texas at Austin
- STSpace Telescope Science InstituteAwards: NAS5-26555, HST-AR-14282, 26555
- ARAmes Research Center