QCD phase transition in the early universe - Theory Center
QCD phase transition in the early universe - Theory Center
QCD phase transition in the early universe - Theory Center
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Overview – <strong>QCD</strong>: Properties – F<strong>in</strong>ite Temperature <strong>QCD</strong> – Unsettled Issues – Early Universe - Summary<br />
Properties of <strong>QCD</strong> II<br />
● Chiral symmetry<br />
– Connection of left- and right-handed quarks<br />
– Exact symmetry if quarks are massless<br />
– (Weak) explicit break<strong>in</strong>g by quark masses<br />
● Chiral symmetry spontaneously broken<br />
– Nucleon mass of ~1 GeV although bare quark<br />
masses ~5-10 MeV<br />
– “Constituent” or bound state quark masses larger<br />
by ~300 MeV<br />
<strong>QCD</strong> Phase Transition(s) & The Early Universe/Axel Maas
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