Equation of state of cold and dense QCD matter in resummed perturbation theory
Yuki Fujimoto, Kenji Fukushima
Abstract
We discuss the hard dense loop resummation at finite quark mass and evaluate the equation of state (EoS) of cold and dense QCD matter in $\ensuremath{\beta}$ equilibrium. The resummation in the quark sector has an effect of lowering the baryon number density and the EoS turns out to have much smaller uncertainty than the perturbative QCD estimate. Our numerical results favor smooth matching between the EoS from the resummed QCD calculation at high density and the extrapolated EoS from the nuclear matter density region. We also point out that the speed of sound in our EoS slightly exceeds the conformal limit.
Topics & Concepts
ResummationPhysicsQuantum chromodynamicsParticle physicsPerturbation theory (quantum mechanics)Equation of stateBaryonQCD matterQuantum electrodynamicsQuark–gluon plasmaQuantum mechanicsPulsars and Gravitational Waves ResearchHigh-Energy Particle Collisions ResearchQuantum Chromodynamics and Particle Interactions