The Quark-Hadron Transition in the Early Universe

Understand

We use recent lattice QCD outputs to work out the expansion law of the Universe during the cosmological quark--hadron transition.

• To do so, a suitable technique to exploit both pressure and energy density data, with the related error bars, is introduced.
• We also implement suitable techniques to relate the T range where lattice outputs are available with lower and higher T's, for which we test suitable expressions.
• We finally compare the cosmological behavior found using lattice data with the one obtainable in the case the transition were first order, although not so far from the crossover transition we studied.