In the Standard Model, the electroweak phase transition happens at temperatures around 160 GeV — the energy scale where the Higgs field acquires its vacuum expectation value. This occurred roughly 10⁻¹¹ seconds after the Big Bang. The QCD chiral transition happens much later, at around 150 MeV, when quarks condense into hadrons. The ordering is: electroweak first, QCD second.
This paper reverses the order. In a minimal extension of the Standard Model with hidden scale invariance (adding only a light dilaton), the Higgs field remains trapped in its symmetric phase — no vacuum expectation value, no particle masses — until the universe cools to approximately 28 MeV. At that temperature, the QCD chiral phase transition acts as the trigger: the chiral condensate's formation destabilizes the Higgs potential and kicks the electroweak transition into happening.
The delay changes everything. A first-order electroweak transition at 28 MeV (instead of a crossover at 160 GeV) produces primordial black holes, low-frequency gravitational waves, and exotic multi-quark nuggets. The cosmological consequences are dramatic, yet the model is nearly indistinguishable from the Standard Model at collider energies.
The strong force tells the weak force when to break. The hierarchy of energy scales in particle physics does not determine the chronological order of phase transitions. The weakest transition waits for the strongest to go first.