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A classically scale-invariant scalar singlet can be a MeV-scale dark matter,with a feeble Higgs portal coupling at $\mathcal{O}(10^{-10})$. Besides, an$\mathcal{O}(0.1)$ self-interaction coupling could further serve to alleviatethe small-scale problems in the Universe. We show that, such a dark mattercandidate can naturally arise in the warped extra dimension, with the huge spanof parameter space predicted well within $\mathcal{O}(1)$ fundamentalparameters.

Freeze-in self-interacting dark matter in warped extra dimension