Chiral Symmetry and Heavy-Ion Collisions

Understand

I revisit the phase structure of hot and dense matter out of quarks and gluons with some historical consideration on the color deconfinement and chiral phase transitions.

• My goal is to make clear which part of the QCD phase diagram is under theoretical control and which part is not.
• I demonstrate that an uncommon but logically possible scenario other than the standard phase diagram cannot be ruled out.
• My emphasis is on the concern that one should correctly understand what kind of phenomenon occurs associated with the phase boundary line on the diagram.