Strongly interacting massive particle

A strongly interacting massive particle (SIMP) is a hypothetical particle that interacts strongly between themselves and weakly with ordinary matter, but could form the inferred dark matter despite this.^[1][2][3]

Strongly interacting massive particles have been proposed as a solution for the ultra-high-energy cosmic-ray problem^[4][5] and the absence of cooling flows in galactic clusters.^[6][7]

Various experiments and observations have set constraints on SIMP dark matter from 1990 onward.^{[8][9][10][11][12][13]}

SIMP annihilations would produce significant heat. DAMA set limits with NaI(Tl) crystals.^{[11][citation needed]}

Measurements of Uranus's heat excess exclude SIMPs from 150 MeV to 10⁴ GeV.^[14] Earth's heat flow significantly constrains any cross section.^[15]

See also

• Weakly interacting massive particles – Hypothetical particles that may constitute dark matterPages displaying short descriptions of redirect targets
• Self-interacting dark matter – Hypothetical form of dark matter consisting of particles with strong self-interactions
• Massive compact halo object – Hypothetical form of dark matter in galactic halos