INTERACTING QUARK MATTER EQUATION OF STATE FOR COMPACT STARS

By E. Fraga, A. Kurkela, A. Vuorinen. 2013

169 citations recorded by the source corpus.

Lattice quantum chromodynamics (QCD) studies of the thermodynamics of hot quark–gluon plasma demonstrate the importance of accounting for the interactions of quarks and gluons if one wants to investigate the phase structure of strongly interacting matter. Motivated by this observation and using state-of-the-art results from perturbative QCD, we construct a simple, effective equation of state (EOS) for cold quark matter that consistently incorporates the effects of interactions and furthermore includes a built-in estimate of the inherent systematic uncertainties. This goes beyond the MIT bag model description in a crucial way, yet leads to an EOS that is equally straightforward to use. We also demonstrate that, at moderate densities, our EOS can be made to smoothly connect to hadronic EOSs, with the two exhibiting very similar behavior near the matching region. The resulting hybrid stars are seen to have masses similar to those predicted by the purely nucleonic EOSs.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/25ee5f98a7fc8fd7f13a24e69da2d62f4a001b08

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In Astronomy and Astrophysics

1. A. Watts
2. S. Guillot
3. J. Lattimer
4. A. Schwenk
5. K. Hebeler
6. T. E. Riley
7. T. Hinderer
8. S. K. Greif

In Nuclear and High Energy Physics

1. A. Schwenk
2. K. Hebeler
3. A. Watts
4. J. Lattimer
5. S. K. Greif
6. Geert Raaijmakers
7. T. E. Riley
8. R. Ludlam

Citations in the corpus

• Equation of state sensitivities when inferring neutron star and dense matter properties (2018, methodology): “(iii) The speed of sound for each EOS must converge to 1/ √ 3 from below at least for asymptotically high densities (∼50 n0) as determined by pQCD calculations (Fraga et al. 2014).”
• A NICER View of PSR J0030+0451: Implications for the Dense Matter Equation of State (2019, background): “…from below at ∼50ρs, following the calculations of the speed of sound for asymptotically high densities by perturbative quantum chromodynamics (pQCD; Fraga et al. 2014); (iii) the bulk properties of matter at densities ρ 1.5ρs can be described as a normal Fermi liquid, which restricts the speed…”