%0 Generic %1 morrison2020large %A Morrison, Logan %A Profumo, Stefano %A Robinson, Dean J. %D 2020 %K tifr %T Large $N$-ightmare Dark Matter %U http://arxiv.org/abs/2010.03586 %X 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 $N 10$, 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.

@misc{morrison2020large, 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.}, added-at = {2020-10-12T09:45:52.000+0200}, author = {Morrison, Logan and Profumo, Stefano and Robinson, Dean J.}, biburl = {https://www.bibsonomy.org/bibtex/2d1fc9b1dfc547bae3a47b2e0269ed5cf/citekhatri}, description = {Large $N$-ightmare Dark Matter}, interhash = {0a94eb1ab341117e2bb4e974f5b72e7d}, intrahash = {d1fc9b1dfc547bae3a47b2e0269ed5cf}, keywords = {tifr}, note = {cite arxiv:2010.03586Comment: 28 pages, 6 figures}, timestamp = {2020-10-12T09:45:52.000+0200}, title = {Large $N$-ightmare Dark Matter}, url = {http://arxiv.org/abs/2010.03586}, year = 2020 }