Abstract

Recently, the first evidence of dark matter (DM) non-gravitational self-interaction has been reported for the Abell 3827 cluster, where a displacement of the luminous mass with respect to the maximum density of its DM halo has been observed, for some of the merging galaxies. We present here a plausible explanation for this puzzling behaviour interpretation, considering that most of DM consists of Bose-Einstein condensed ultra-light axions that can form robust coherent solitons, which display interference properties similar to those observed in nonlinear optics.

© 2016 Optical Society of America