Dark Matter BEC Halos Compared To Galaxy Rotation Rates

by Tommy on 12/01/2017

This seems fairly definitive.



Bose-Einstein Condensate Dark Matter Halos confronted with galactic rotation curves, M. Dwornik, Z. Keresztes, E. Kun and L. A. Gergely, Institute of Physics, University of Szeged, Dom Ter 9, Szeged 6720, Hungary (29 October 2016)

We present a comparative confrontation of both the Bose-Einstein Condensate (BEC) and the Navarro-Frenk-White (NFW) dark halo models with galactic rotation curves. We conclude that the BEC model fits better the dwarf galaxy dark matter distribution, but suffers from sharp cut-off in larger galaxies, where the NFW model performs better. In more detail, we employ High Surface Brightness (HSB), Low Surface Brightness (LSB) and dwarf galaxies with rotation curves falling into two classes, based on their shapes. In the first class the rotational velocities increase with radius over the whole observed range, the BEC and NFW models giving comparable fits for both HSB and LSB galaxies, while significantly improving over the NFW fit for dwarf galaxies. This improvement is due to the central density cusp avoidance property of the BEC model. The rotational velocity of HSB and LSB galaxies falling into the second class exhibit long at plateaus, resulting in a better fit of the NFW model for HSB galaxies, and comparable fits for LSB galaxies. The weaker performance of the BEC model for the HSB type II galaxies is due to the BEC density profiles dropping rapidly to zero outside a nearly constant density core. The investigated galaxy sample obeys the Tully-Fisher relation, including the particular characteristics exhibited by dwarf galaxies. We also show that in both dark matter models the fitting enforces a relation between the dark matter parameters: the characteristic density scales inversely with the corresponding characteristic distance.

So its basically game over for everything except the microwave axion.

Only the string theory community is holding this up now.


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