QCD phase transition in the early universe - Theory Center

Overview – QCD – Finite Temperature QCD – Unsettled Issues: Trace anomaly – Early Universe - Summary
Origin of the Trace Anomaly
● Only one independent thermodynamic quantity
p= T
V ln Z =T 2 ∂
∂T
● Re-express everything by trace anomaly
p
● Only a term linear in T can contribute
to p but not to ε
p
T
QCD Phase Transition(s) & The Early Universe/Axel Maas
∞
T 4 =c SB −∫ T
dT
T 5
=−3 p=T 5 ∂
∂T
∞
T 4 =3c SB −∫ T
[Following Zwanziger, 2004]
dT 1
T 3
p
T 4
∂
∂T
T