Recent Progress in Neutron Star Theory

Heiselberg, H.; Pandharipande, V.R.

doi:10.1146/annurev.nucl.50.1.481

Cited by 181 publications

(188 citation statements)

References 125 publications

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“…Color superconductivity in quark matter becomes an astrophysically interesting problem if neutron star interiors are sufficiently dense that they contain quark matter cores [25]. Generally, a quark superfluid in a neutron star would not be electrically neutral since each quark has fractional electric charge; rather it would coexist with electrons (and muons) in such a way as to ensure electric neutrality in the system.…”

Section: Introductionmentioning

confidence: 99%

Superfluid phases of quark matter: Ginzburg-Landau theory and color neutrality

2001

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We systematically apply Ginzburg-Landau theory to determine BCS pairing in a strongly-coupled uniform superfluid of three-flavor massless quarks in flavor equilibrium. We elucidate the phase diagram near the critical temperature in the space of the parameters characterizing the thermodynamicpotential terms of fourth order in the pairing gap. Within the color and flavor antisymmetric channel with zero total angular momentum, the phase diagram contains an isoscalar, color-antitriplet phase and a color-flavor-locked phase, reached by a second order phase transition from the normal state, as well as states reached by a first order phase transition. We complement the general GinzburgLandau approach by deriving the high-density asymptotic form of the Ginzburg-Landau free energy from the finite temperature weak-coupling gap equation. The dynamically-screened, long-range color magnetic interactions are explicitly taken into account in solving the gap equation. We find that in the limit of weak coupling, the isoscalar, color-antitriplet phase has higher free energy near the transition temperature than the color-flavor locked phase.In view of the fact that deconfined quark matter must be color charge neutral, we incorporate the constraint of overall color neutrality into the general Ginzburg-Landau theory and the gap equation. This constraint yields a disparity in the chemical potential between colors and reduces the size of the pairing gap, in the presence of the anisotropy of the order parameters in color space. In comparison with the case in which there are no chemical potential differences between colors and hence the superfluid generally has nonzero net color charge, we find that while the constraint of color neutrality has only negligible effects on the gap in the weak coupling regime, it appreciably destabilizes the isoscalar, color-antitriplet phase in the strong coupling regime without affecting the color-flavor-locked phase.

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Section: Introductionmentioning

confidence: 99%

Superfluid phases of quark matter: Ginzburg-Landau theory and color neutrality

2001

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“…The equation of state for neutron stars for densities below nuclear matter ρ n ∼ 2 × 10 14 g/cm 3 is fairly well understood [45,46], while for densities above ρ n there is the possibility of hyperon rich matter, pion and or kaon condensates, muons, and other exotica [43,44,45,46]. Modern theories of superdense nuclear matter [45,46,43,44], predict a composition for neutron stars that is depicted qualitatively in fig.…”

Section: Stellar Evolution 101: Qgp At the Core Of Pulsars?mentioning

confidence: 99%

“…Modern theories of superdense nuclear matter [45,46,43,44], predict a composition for neutron stars that is depicted qualitatively in fig. (2) A crust of ( 56 F e) nuclei, electrons and neutrons, followed by an internal region of neutron and proton superfluids with the possibility of pion and kaon condensates and hyperons.…”

Section: Stellar Evolution 101: Qgp At the Core Of Pulsars?mentioning

confidence: 99%

Phase transitions in the early and the present Universe: from the big bang to heavy ion collisions

Boyanovsky

2001

Phase Transitions in the Early Universe: Theory and Observations

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In these lectures I discuss cosmological phase transitions with the goal of establishing the possibility of observational consequences. I argue that the only phase transition amenable of experimental study within the foreseeable future is that predicted by QCD and discuss some of the potential observational cosmological consequences associated with this phase transition(s). I describe the experimental effort to study the QCD phase transition(s) at RHIC and SPS and summarize some of the recent experimental results. The possibility of novel phases of QCD in the core of pulsars is discussed along with the suggested observational consequences. A brief review of standard big bang cosmology as well as the astrophysics of compact stars sets the stage for understanding the observational cosmological and astrophysical consequences of phase transitions in the standard model.

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“…Such a short range repulsion is important for the stability of atomic nuclei against collapse, for determining the maximum mass of neutron stars, and for igniting the Type II supernova explosions [11,12,13].…”

Section: Introductionmentioning

confidence: 99%

Hadron interactions from lattice QCD

Aoki

2008

Proceedings of the XXV International Symposium on Lattice Field Theory — PoS(LATTICE 2007)

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Progress on the potential method, recently proposed to investigate hadron interactions in lattice QCD, is reviewed. The strategy to extract the potential in lattice QCD is explained in detail. The method is applied to extract N N potentials, hyperon potentials and the meson-baryon potentials. A theoretical investigation is made to understand the origin of the repulsive core using the operator product expansion. Some recent extensions of the method are also discussed.

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Recent Progress in Neutron Star Theory

Cited by 181 publications

References 125 publications

Superfluid phases of quark matter: Ginzburg-Landau theory and color neutrality

Superfluid phases of quark matter: Ginzburg-Landau theory and color neutrality

Phase transitions in the early and the present Universe: from the big bang to heavy ion collisions

Hadron interactions from lattice QCD

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