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]
{{cite book}}
: |journal=
ignored (help)CS1 maint: location missing publisher (link)