The top comment (on the actual article) suggests that the effect may be a result of dark matter resonance: http://journals.aps.org/prl/abstract/10.1103/PhysRev

The top comment (on the actual article) suggests that the effect may be a result of dark matter resonance: http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.111.231801 http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.111... Which is way over my head, but interesting.