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Abstract: A survey is given of recent QCD theory advances concerning the phase diagram,in particular the indications for a critical point and adjacent first orderphase transition at high baryo-chemical potential, and the new ideas concerninga further phase at high $\mu {B}$, the quarkyonic matter phase. The latterstate might finally explain the hadro-chemical equilibrium freeze-out pointsfrom A+A collisions at energies below SPS energy. We review severalevent-by-event fluctuation signals that promise to shed a light on theexistence of a critical point, and we discuss its possible reflection in recentlattice QCD calculations.



Author: Reinhard Stock

Source: https://arxiv.org/







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