How do physicists calculate nuclear matter's pressure near the quark transition?

Physicists refined a method for computing properties of extremely hot, dense nuclear matter by ensuring it respects quantum symmetries while remaining thermodynamically consistent. The catch: respecting symmetries adds complications that make pressure hard to define. The team tested three ways to calculate pressure using a simplified QCD model and found the answer robust across the chiral transition—the phase where quarks can move freely—though details differ near the crossover point.