http://arxiv.org/abs/1608.00802
We study cosmological structure formation with ultra-light axion dark matter (or “fuzzy dark matter”, FDM) using a particle-mesh scheme to account for the quantum pressure arising in the Madelung formulation of the Schr\”odinger-Poisson equations. Sub-percent level energy conservation and correct linear behavior are demonstrated. Whereas the code gives rise to the same core-halo profiles as direct simulations of the Schr\”odinger equation, it does not reproduce the detailed interference patterns at the resolution used here. In cosmological simulations with FDM inital conditions, we find a maximum relative difference of O($10\%$) in the power spectrum near the quantum Jeans length compared to using a standard N-body code with identical initial conditions. This shows that the effect of quantum pressure during nonlinear structure formation cannot be neglected for precision constraints on a dark matter component consisting of ultra-light axions.
J. Veltmaat and J. Niemeyer
Wed, 3 Aug 16
46/54
Comments: 7 pages, 8 figures
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