Lattice QCD at non-vanishing density (A02)

• Subject Area: Nuclear and Elementary Particle Physics, Quantum Mechanics, Relativity, Fields
• Term: since 2017
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 315477589

Strongly interacting matter at finite baryon density behaves in so far theoretically intractable ways. Standard lattice QCD simulation techniques cannot be applied to this regime because of the sign problem. We use effective theories based on the strong coupling and hopping expansions of QCD to circumvent this issue and study the cold and dense regions of the phase diagram. We also investigate the role of entanglement measures in characterizing QCD phases of matter and develop lattice techniques to measure them. Further, on the way towards fully alleviating the sign problem in various regions of the QCD parameter space, we develop algorithms to simulate QCD theories using quantum computers.

• DFG Programme: CRC/Transregios
• Subproject of: TRR 211: Strong-Interaction Matter under Extreme Conditions
• Applicant Institution: Universität Bielefeld
• Project Heads: Adrien Florio, Ph.D., since 1/2026; Professor Dr. Owe Philipsen; Dr. Caroline Robin, since 1/2026; Dr. Wolfgang Unger, until 12/2025