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In this article we propose a class of extremely light feebly interactingmassive particle, FI$m$Ps. They are combination of feebly interacting massiveparticle with scale invariance, by which DM stability, mass origin and relicdensity are inherently related. In the scale invariant version of the StandardModel (SM) with three right-handed neutrinos ($\nu$SISM), the lightest $N_1$realizes the FI$m$P scenario. In this example scalar singlets, which areintrinsic to the $\nu$SISM, generate mass and relic density for this FI$m$Psimultaneously. Moreover, they are badly needed for electroweak symmetryspontaneously breaking. Interestingly, a 7.1 keV $N_1$ with correct relicdensity, that can explain the recent 3.55 keV $X-$ray line, lies in the bulkparameter space of our model.

Upgrading Sterile Neutrino Dark Matter to FI$m$P Using Scale Invariance