Confinement and symmetry from vacuum to QCD phase diagram (EMMI Workshop)
(Centro de Ciencias de Benasque Pedro Pascual, May 30 - Jun 05, 2027)

Organizers:

L. Glozman (Graz U), T. Cohen (Maryland U), K. Fukushima (Tokyo U), Y. Hidaka (Yukawa Institute), L. McLerran (INT, U of Washington)

Scientific Case

The main questions to be addressed are summarized in the following key topics:

• Confinement of colored degrees of freedom and the symmetries realized in the QCD vacuum toward understanding the origin of hadron mass.
• Topological objects in strongly interacting matter to distinguish confinement and deconfinement regimes.
• Emergent symmetries and finer structures in the QCD phase diagram.

These topics reflect the ongoing revision of our understanding of hadron mass generation and its connection to confinement and QCD symmetries, as well as related advances in our understanding of strongly interacting matter under extreme conditions. Recent developments have provided a fresh perspective on the QCD phase diagram even in the high-T and low-µ regime. These developments have important implications across a wide range of research fields from relativistic heavy-ion collisions to neutron-star physics.

This workshop is particularly timely in light of the recent accumulation of lattice-QCD-based evidence that motivates a critical re-examination of the conventional picture of confinement and symmetries in QCD. In particular, the connection between spontaneous symmetry breaking and confinement, and its role in the generation of hadron masses in the light-quark sector, may be far less firmly established than previously believed. Chiral symmetry restoration at high-T and/or high-µ does not necessarily require deconfinement.

Lattice-QCD simulations have identified a regime above the critical temperature with an emergent approximate chiral spin symmetry, which suggests that chirally symmetric quarks are connected into the color-singlets by the chromoelectric field. This interpretation is also connected with recent lattice-QCD studies of topological excitations. Lattice-inspired considerations are raising the question of when and how gluons become genuinely deconfined and form a plasma.

These new insights and questions call for a serious effort to develop both theoretical and experimental approaches.

A List of confirmed Key Speakers

• Chris Allton (Swansea U.; Why is the strong force strong? What topology tells us about quark interactions (T-dependence) )
• Anton Andronic (U. of Münster; Hadron yields in central collisions, statistical hadronization and the QCD phase diagram)
• Szabolcs Borsanyi (U. of Wuppertal; Chiral and deconfinement phase boundaries on the QCD phase diagram)
• Peter Braun-Munzinger (GSI; Loosely bound states and relativistic nuclear collisions)
• Gerald Dunne (U. of Connecticut; Resurgence and Crossing the Chern-Simons Natural Boundary)
• Thomas DeGrand: (U. of Colorado; Lattice studies of QCD with more than three colors near the chiral crossover temperature)
• Jeff Greensite (San Francisco State U.; Beyond a color-neutral spectrum: the meaning of "confinement" when the asymptotic string tension is zero)
• Derek Leinweber (U. Adelaide; New insights into the structure of centre-vortex sheets)
• Biagio Lucini (Queen Mary U. of London; Topological analysis for deconfinement)
• Peter Petreczky (BNL; Heavy flavor spectral functions, phase diagram and fluctuations of conserved charges on the lattice)
• Owe Philipsen (Frankfurt U.; Chiral phase transition for many flavour QCD and onset of the conformal window)
• Robert Pisarski (BNL; Fractional anomalous determinants and phase diagram of QCD)
• Krzystof Redlich (U. Wrocław; Hadron spectra and thermodynamics for all quark flavors from a universal Hagedorn temperature and heavy flavor production in HIC)
• Hugo Reinhardt (U. Tübingen; QCD in Coulomb gauge or center vortex functional)
• Mikhail Shifman (U. Minnesota; TBA)
• Johanna Stachel (Heidelberg U.; Heavy flavor as probe of deconfinement)
• Wolfram Weise (Technical U. of Munich; Dense baryonic matter: equation of state from neutron star observations )
• Laurence G. Yaffe (U. Washington; Numerical solution of large Nc QCD)

The participation is by invitation only. If you want to participate with a shorter talk or without you need to get the invitation; please contact L. Ya. Glozman (leonid.glozman@uni-graz.at))

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