Neutron stars, hybrid stars and the equation of state

Quantum hadrodynamics (QHD) is a framework for describing the nuclear many-body problem as a relativistic system of baryons and mesons. Motivation is given for the utility of such an approach and for the importance of basing it on a local, Lorentz-invariant lagrangian density. Calculations of nuclear matter and finite nuclei in both renormalizable and nonrenormalizable, effective QHD models are discussed. Connections are made between the effective and renormalizable models, as well as between relativistic mean-field theory and more sophisticated treatments. Recent work in QHD involving nuclear structure, electroweak interactions in nuclei, relativistic transport theory, nuclear matter under extreme conditions, and the evaluation of loop diagrams is reviewed.

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“…The role of the QGP in the neutron matter equation of state is examined in [Ro92] and more generally in [Ma93b,Dr95,Ka95,Ri95].…”

Section: B Extrapolation and Connections To Qcdmentioning

confidence: 99%

Recent Progress in Quantum Hadrodynamics

Serot

Walecka

1997

Int. J. Mod. Phys. E

987

1,511

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“…These calculations can be divided broadly into two categories. In the first category, the mixed phase region consists of neutron matter and quark matter, each of these are charge neutral and are in chemical equilibrium [4,6,10,13]. In such calculations, the baryon chemical potential #B is the only conserved charge.…”

Section: Introductionmentioning

confidence: 99%

“…Also, for a second order transition the stellar mass curve closely resembles the case with no transition. Rosenhaur et al [4] have used a phenomenological equation of state for the hadronic phase depending on baryon density and incompressibility. A Bag model is used for the quark matter phase.…”

Section: Introductionmentioning

confidence: 99%

Hybrid stars and quark hadron phase transition in chiral colour dielectric model

Ghosh

Phatak

Sahu

1995

Z. Physik A - Hadrons and Nuclei

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Abstract.We investigate the properties of hybrid stars consisting of quark matter in the core and hadron matter in outer region. The hadronic equation of state (EOS) is calculated by using nonlinear Walecka model. Strange baryons are included in the hadronic EOS calculation. The chiral colour dielectric (CCD) model, in which quarks are confined dynamically, is used to calculate quark matter EOS. We find that the phase transition from hadron to quark matter is possible in a narrow range of the parameters of nonlinear Walecka and CCD models. The transition is strong or weak first order depending on the parameters used. The EOS thus obtained, is used to study the properties of hybrid stars. We find that the calculated hybrid star properties are similar to those of pure neutron stars.

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“…Quark matter is not absolutely stable but exists at high densities in the interior of a neutron star, where at a certain density the transition from hadronic to quark matter takes place. Such an object containing a quark matter core surrounded by a hadronic mantle is called a hybrid star [8].…”

Section: Quark Matter In Neutron Stars (Theory)mentioning

confidence: 99%

Strange quark matter in neutron stars?—new results from Chandra and XMM

Thoma¹,

Truemper²,

Burwitz

2003

J. Phys. G: Nucl. Part. Phys.

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It has been predicted that quark and hybrid stars, containing strange quark matter in their core, have a significantly smaller radius than ordinary neutron stars. Preliminary X-ray observations of isolated neutron stars indicated a surprisingly small radius consistent with quark matter in the interior of the star. However, a new analysis of the data led to a radius corresponding to an ordinary neutron star. In the present talk we will discuss theoretical calculations of the mass-radius relation for quark and hybrid stars, taking into account medium effects in quark matter, and report on recent X-ray observations by Chandra and XMM and their latest interpretation.

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Neutron stars, hybrid stars and the equation of state

Cited by 38 publications

References 37 publications

Recent Progress in Quantum Hadrodynamics

Recent Progress in Quantum Hadrodynamics

Hybrid stars and quark hadron phase transition in chiral colour dielectric model

Strange quark matter in neutron stars?—new results from Chandra and XMM

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