Quark epoch
In physical cosmology the Quark epoch was the period in the evolution of the early universe when the fundamental interactions of gravitation , electromagnetism , the strong interaction and the weak interaction had taken their present forms , but the temperature of the universe was still too high to allow quarks to bind together to form hadrons . 
<triplet> gravitation <subj> fundamental interaction <obj> instance of <triplet> strong interaction <subj> fundamental interaction <obj> instance of <triplet> weak interaction <subj> fundamental interaction <obj> instance of