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- W3092194116 abstract "A dark QCD sector is a relatively minimal extension of the Standard Model (SM) that admits Dark Matter (DM) candidates but requires no portal to the visible sector beyond gravitational interactions: A nightmare scenario for DM detection. We consider a secluded dark sector containing a single flavor of light, vector-like dark quark gauged under $SU(N)$. In the large-$N$ limit, this single-flavor theory becomes highly predictive, generating two DM candidates whose masses and dynamics are described by few parameters: A light quark-antiquark bound state, the dark analog of the $eta'$ meson, and a heavy bound state of $N$ quarks, the dark analog of the $Delta^{++}$ baryon. We show that the latter may freeze-in with an abundance independent of the confinement scale, forming DM-like relics for $N lesssim 10$, while the former may generate DM via cannibalization and freeze-out. We study the interplay of this two-component DM system and determine the characteristic ranges of the confinement scale, dark-visible sector temperature ratio, and $N$ that admit non-excluded DM, once the effects of self-interaction constraints and bounds on effective degrees of freedom at the BBN and CMB epochs are included." @default.
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- W3092194116 date "2021-05-01" @default.
- W3092194116 modified "2023-09-24" @default.
- W3092194116 title "Large N-ightmare dark matter" @default.
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- W3092194116 doi "https://doi.org/10.1088/1475-7516/2021/05/058" @default.
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