The supersymmetric (SUSY) E₆ inspired U(1)N extension of the Standard Model includes exotic fermions to ensure anomaly cancellation. The cold dark matter in this SUSY model (SE₆SSM) can be formed by the gravitino with mass m3/2 1\,GeV and the lightest neutral exotic fermion. We examine the spin-independent dark matter nucleon scattering cross-section within the SE₆SSM and argue that it can be substantially smaller than the current experimental bounds.
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R. Nevzorov (2024) studied this question.
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