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Cold and Fuzzy Dark Matter

Wayne Hu, Rennan Barkana, Andrei Gruzinov

Abstract

Cold dark matter (CDM) models predict small-scale structure in excess of observations of the cores and abundance of dwarf galaxies. These problems might be solved, and the virtues of CDM models retained, even without postulating {\it ad hoc} dark matter particle or field interactions, if the dark matter is composed of ultra-light scalar particles (m ~ 10^{-22}eV), initially in a (cold) Bose-Einstein condensate, similar to axion dark matter models. The wave properties of the dark matter stabilize gravitational collapse providing halo cores and sharply suppressing small-scale linear power.

Cold and Fuzzy Dark Matter

Abstract

Cold dark matter (CDM) models predict small-scale structure in excess of observations of the cores and abundance of dwarf galaxies. These problems might be solved, and the virtues of CDM models retained, even without postulating {\it ad hoc} dark matter particle or field interactions, if the dark matter is composed of ultra-light scalar particles (m ~ 10^{-22}eV), initially in a (cold) Bose-Einstein condensate, similar to axion dark matter models. The wave properties of the dark matter stabilize gravitational collapse providing halo cores and sharply suppressing small-scale linear power.

Paper Structure

This paper contains 9 equations, 1 figure.

Figures (1)

  • Figure 1: One dimensional simulations (a) large Jeans scale $r_J/L=0.44$ (b) small Jeans scale $r_J/L=0.044$. Two snapshots, $t/t_{\rm dyn}=99$ (solid) and 100 (dotted) are shown for the density profile (units of 15$\rho_0$) and gravitational acceleration (units of $3 L/ 2 t_{\rm dyn}^2$, offset for clarity).