The early universe got stuck in a weird phase as it cooled, leaving behind giant 'nuggets' of matter that we’re still finding today.
March 20, 2026
Original Paper
QCD and electroweak phase transitions with hidden scale invariance: implications for primordial black holes, quark-lepton nuggets and gravitational waves
arXiv · 2603.18406
The Takeaway
Standard models suggest the universe's fundamental forces settled into their current form almost instantly after the Big Bang, but this research shows the Higgs field might have stayed 'stuck' in a different phase for a long time. This delay would have created bizarre, dense clusters of matter and unique gravitational waves that we might be able to detect today.
From the abstract
We study the cosmological implications of the minimal non-linear realisation of scale invariance within the Standard Model (SM). This framework provides a technically natural explanation for the hierarchy between the Planck scale and the electroweak scale and introduces only a light, feebly coupled dilaton field beyond the SM particles. Although the model is almost indistinguishable from the minimal SM at low energies, its cosmological consequences differ dramatically. In particular, the electro