Signatures of a High Temperature QCD Transition in the Early Universe
arXiv:2212.00156 · doi:10.1103/PhysRevLett.130.221002
Abstract
Beyond Standard Model extensions of QCD could result in quark and gluon confinement occurring well above a temperature of GeV. These models can also alter the order of the QCD phase transition. The enhanced production of primordial black holes (PBHs) that can accompany the change in relativistic degrees of freedom at the QCD transition therefore could favor the production of PBHs with mass scales smaller than the Standard Model QCD horizon scale. Consequently, and unlike PBHs associated with a standard GeV-scale QCD transition, such PBHs can account for all the dark matter abundance in the unconstrained asteroid-mass window. This links beyond Standard Model modifications of QCD physics over a broad range of unexplored temperature regimes ( TeV) with microlensing surveys searching for PBHs. Additionally, we discuss implications of these models for gravitational wave experiments. We show that a first order QCD phase transition at TeV is consistent with the Subaru Hyper-Suprime Cam candidate event, while a GeV transition is consistent with OGLE candidate events, and also could account for the claimed NANOGrav gravitational wave signal.
arXiv comment9 pages, 3 figures; version published in PRL
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