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Mirror matter and other dark matter modelsa Russian Federation State Scientific Center ‘A.I. Alikhanov Institute of Theoretical and Experimental Physics’, ul. Bolshaya Cheremushkinskaya 25, Moscow, 117259, Russian Federation b Lomonosov Moscow State University, Shternberg State Astronomical Institute, Universitetskii prosp. 13, Moscow, 119889, Russian Federation c Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russian Federation This state-of-the-art review briefly discusses the role of the mirror matter (MM) model in the context of the dark matter (DM) problem. First proposed in 1966 by I.Yu. Kobzarev, L.B. Okun, and I.Ya. Pomeranchuk, MM is the oldest but still viable candidate—admittedly with some modifications—for describing real DM. The difficulties of standard ΛCDM model with WIMPs (Weakly Interacting Massive Particles) are outlined, and situations where mirror matter could be helpful in resolving some of them are identified. Mirror particles are a subclass of a wider set of ADM (Asymmetric DM, where DM particles do not annihilate, unlike supersymmetric particles in ΛCDM). References on limits for cross-sections of ADM model bosons accreting onto neutron stars are provided. They can be much lower than experimental limits for WIMPs.
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