Apr 23 – 27, 2023
JMS Aster Plaza
Asia/Tokyo timezone

Trace anomaly as a measure of conformality at finite density

Apr 26, 2023, 3:50 PM
Multi-Purpose Studio, 2nd Floor (JMS Aster Plaza)

Multi-Purpose Studio, 2nd Floor

JMS Aster Plaza

Oral QCD phase diagram and extreme states Parallel Session C


Yuki Fujimoto (University of Washington)


We shed a light on the nature of matter at extremely high baryon density and contrast it to hot QCD matter by using the trace anomaly as a measure of conformality. We discuss an interpretation that a peak in the sound velocity in high-density matter, as suggested by the neutron-star observational data, signifies strongly-correlated conformal matter. The normalized trace anomaly is a dimensionless measure of conformality leading to the derivative and the non-derivative contributions to the sound velocity. We find that the peak in the sound velocity is attributed to the derivative contribution from the trace anomaly that steeply approaches the conformal limit. Smooth continuity to the behavior of high-density QCD implies that the matter part of the trace anomaly may be positive definite. We discuss a possible implication of the positivity condition of the trace anomaly on the observable quantities in the real world.
Reference: Phys. Rev. Lett. 129, 252702 [2207.06753]

Theory / experiment Theory

Primary authors

Yuki Fujimoto (University of Washington) Prof. Kenji Fukushima (The University of Tokyo) Larry McLerran Michal Praszalowicz (Jagiellonian University, Krakow)

Presentation materials