Collective plasma instabilities in dark U(1) matter would scatter dark matter during cluster mergers, pushing the allowed dark charge-to-mass ratio below 2×10^−14 GeV^−1, about ten orders of magnitude stronger than before.
Collisionless shocks in self-interacting dark matter
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abstract
Self-interacting dark matter has been proposed as a solution to small scale problems in cosmological structure formation, and hints of dark matter self scattering have been observed in mergers of galaxy clusters. One of the simplest models for self-interacting dark matter is a particle that is charged under dark electromagnetism, a new gauge interaction analogous to the usual electromagnetic force, but operating on the dark matter particle instead of the visible particles. In this case, the collisional behaviour of dark matter is primarily due to the formation of collisionless shocks, that should affect the distribution of DM in merging galaxy clusters. We evaluate the time and length scales of shock formation in cluster mergers, and discuss the implications for modelling charged dark matter in cosmological simulations.
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Dark plasmas in the nonlinear regime: constraints from particle-in-cell simulations
Collective plasma instabilities in dark U(1) matter would scatter dark matter during cluster mergers, pushing the allowed dark charge-to-mass ratio below 2×10^−14 GeV^−1, about ten orders of magnitude stronger than before.