Dark matter from stable charged particles?

Understand

Particle physics candidates for cosmological dark matter are usually considered as neutral and weakly interacting.

• However stable charged leptons and quarks can also exist and, hidden in elusive atoms, play the role of dark matter.
• The necessary condition for such scenario is absence of stable particles with charge -1 and effective mechanism for suppression of free positively charged heavy species.
• These conditions are realized in several recently developed scenarios.