Complex singularities around the QCD critical point at finite densities

Understand

Partition function zeros provide alternative approach to study phase structure of finite density QCD.

• The structure of the Lee-Yang edge singularities associated with the zeros in the complex chemical potential plane has a strong influence on the real axis of the chemical potential.
• In order to investigate what the singularities are like in a concrete form, we resort to an effective theory based on a mean field approach in the vicinity of the critical point.
• The crossover is identified as a real part of the singular point.