Can dark matter see itself?
arXiv:astro-ph/0008422
Abstract
Many independent high-resolution simulations of structure formation in cold dark matter models show that galactic halos should have singular core profiles. This is in stark contrast with observations of both low- and high-surface brightness galaxies, which indicate that the dark matter has almost constant density in the central parts of halos. Basically there are three possible avenues to a solution to the problem, which we discuss in turn. Observations of halo profiles could be more uncertain than previously thought, and higher resolution observations could reveal that spirals do have a singular core feature. The highest resolution simulations do not include a baryonic component, and it is conceivable that violent star formation processes and similar phenomena can destroy the singular dark matter core and lead to an almost constant density core profile. Finally, we discuss in more detail the intriguing possibility that the discrepancy hints at some new exotic physics of the dark matter. Warm dark matter and self-interacting dark matter are two of the most promising candidates.
6 pages, talk given at Dark2000 conference in Heidelberg, July 10-14 2000
References in corpus (23)
- Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
- Measurements of Omega and Lambda from 42 High-Redshift Supernovae
- The Structure of Cold Dark Matter Halos
- Evidence for oscillation of atmospheric neutrinos
- Dark Matter Substructure in Galactic Halos
- Observational evidence for self-interacting cold dark matter
- Cold collapse and the core catastrophe
- Starburst-driven Mass Loss from Dwarf Galaxies: Efficiency and Metal Ejection
- Observational and Theoretical Constraints on Singular Dark Matter Halos
- Dark Matter Scaling Relations
- The dark and baryonic matter content of low surface brightness disk galaxies
- Testing the Dark Matter Hypothesis with Low Surface Brightness Galaxies and Other Evidence
- The dearth of halo dwarf galaxies: is there power on short scales?
- Large Scale Structure Tests of Warm Dark Matter
- High Resolution Rotation Curves of Low Surface Brightness Galaxies
- The structure and evolution of weakly self-interacting cold dark matter halos
- Constraints on Self-Interacting Dark Matter
- Evidence of self-interacting cold dark matter from galactic to galaxy cluster scales
- Collisional versus Collisionless Dark Matter
- Collisional dark matter and the structure of dark halos
- CDM-Variant Cosmological Models - I: Simulations and Preliminary Comparisons
- Galactic winds and circulation of the ISM in dwarf galaxies
- Self-interacting Warm Dark Matter