Collisionless plasma instabilities would visibly brake dark-matter halos in cluster mergers, so the clean Bullet Cluster passage bounds the dark electromagnetic coupling to α_D < 4×10^-25 (m_D = 1 TeV).
Zwicky, Phys
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Can plasma physics establish a significant bound on long range dark matter interactions?
Collisionless plasma instabilities would visibly brake dark-matter halos in cluster mergers, so the clean Bullet Cluster passage bounds the dark electromagnetic coupling to α_D < 4×10^-25 (m_D = 1 TeV).