The equation of state in two-, three-, and four-color QCD at non-zero temperature and density
arXiv:1412.6712 · doi:10.1103/PhysRevD.92.014019
Abstract
We calculate the equation of state at non-zero temperature and density from first principles in two-, three- and four-color QCD with two fermion flavors in the fundamental and two-index, antisymmetric representation. By matching low-energy results (from a `hadron resonance gas') to high-energy results from (resummed) perturbative QCD, we obtain results for the pressure and trace anomaly that are in quantitative agreement with full lattice-QCD studies for three colors at zero chemical potential. Our results for non-zero chemical potential at zero temperature constitute predictions for the equation of state in QCD-like theories that can be tested by traditional lattice studies for two-color QCD with two fundamental fermions and four-color QCD with two two-index, antisymmetric fermions. We find that the speed of sound squared at zero temperature can exceed one third, which may be relevant for the phenomenology of high-mass neutron stars.
16 pages, 8 figures
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- Speed of Sound for Hadronic and Quark Phases in a Magnetic Field
- Equation of state and transition temperatures in the quark-hadron hybrid model
- Speed of sound peak in two-color dense QCD: confronting effective models with lattice data
- From pQCD to neutron stars: matching equations of state to constrain global star properties