Abstract
If the strong coupling is promoted to a dynamical field-dependent quantity, it is possible that the strong force looked very different in the early Universe. We consider a scenario in which the dynamics is such that QCD confines at high temperatures with a large dynamical scale, relaxing back to ∼1 GeV before big bang nucleosynthesis. We discuss the cosmological implications and explore potential applications, including fleshing out a new mechanism for baryogenesis which opens up if QCD confines before the electroweak phase transition of the standard model.
Highlights
Introduction.—The standard model (SM) of particle physics provides a fantastic description of a plethora of low energy observations
Our precise understanding of the cosmological history becomes fuzzy for temperatures T ≳ 10 MeV when big bang nucleosynthesis (BBN) begins [1]
It is entirely possible that there is physics beyond the SM that produces a radical departure from the standard cosmological picture at earlier times
Summary
Introduction.—The standard model (SM) of particle physics provides a fantastic description of a plethora of low energy observations. For nf 1⁄4 6, Λ0 ∼ GeV and hφi=MÃ 1⁄4 −0.62, QCD confines at Λ ∼ 1 TeV, well above the temperature of the usual electroweak phase transition. (iv) Additional scalar fields could couple to φ, and themselves undergo symmetry breaking at low temperatures, triggering a shift in the effective VðφÞ
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