Phenomenological QCD equations of state for neutron star mergers
arXiv:1704.04433 · doi:10.1016/j.nuclphysa.2017.06.034
Abstract
Thermal QCD equations of state at high baryon density are sensitive to the phase structure and the resulting excitation modes. The leading contribution at low temperature can be either ~p_F^2 T^2 (pF: Fermi momentum, T: temperature) for phases with gapless quarks, or ~T^4 for phases with gapped quarks. In the latter the thermal pressure is dominated by collective modes. Starting with a schematic quark model developed for neutron star structure, we estimate the thermal contributions and zero point energy from the Nambu-Goldstone modes by building them upon the mean field background for the color-flavor-locked quark matter. Applying the phase shift representation for thermodynamic potentials, we include not only the bound state pairs but also resonating pairs. According to the Levinson's theorem, the high energy contributions tend to cancel the pole contributions to the thermodynamics, tempering the UV behaviors in the zero point energy. Our primary target in this talk is the domain with baryon density nB as large as ~ 5-10n_0 (n_0 = 0.16 fm^{-3}: nuclear saturation density), and the temperature T of the order ~30-100 MeV. The insights into this domain may be obtained through the future detection of gravitational waves from neutron star merging events.
5 pages, 2 figures; prepared for quark matter 2017, Chicago, Illinois, USA
References in corpus (12)
- Shapiro delay measurement of a two solar mass neutron star
- A Massive Pulsar in a Compact Relativistic Binary
- Color superconductivity in dense quark matter
- Hyperon Puzzle: Hints from Quantum Monte Carlo Calculations
- New Critical Point Induced by the Axial Anomaly in Dense QCD
- Phenomenological QCD equation of state for massive neutron stars
- Phase structure, collective modes, and the axial anomaly in dense QCD
- Cool quark matter
- BCS/BEC crossover in Quark Matter and Evolution of its Static and Dynamic properties
- Number of the QCD critical points with neutral color superconductivity
- Phenomenological QCD equations of state for neutron stars
- Pseudoscalar Goldstone bosons in the color-flavor locked phase at moderate densities