超轻无自旋暗物质的自互作用：可拯救吗？

大量 observations on astrophysical 和 cosmological scales 可解释为意味着除了 standard model 中描述的 familiar kind of matter 之外，还存在 Dark Matter (DM)。DM 的 fundamental properties 例如 particle mass、spin、couplings 等 currently being observationally constrained。特别是，如果 DM particles have spin zero，then exist recent constraints which suggest a lower limit on its mass which is often a couple of orders of magnitude larger than $10^{-22}$ eV。In this talk, we will (a) argue that these limits are based on assumption that the self coupling of the spinless DM particles is negligible，and，(b) show how some of these lower limits will get modified in presence of incredibly feeble self interactions。