Relativistic mean-field calculations of Λ and Σ hypernuclei

Glendenning, Norman K.; Von-Eiff, D.; Haft, Michael; Lenske, H.; Weigel, M. K.

doi:10.1103/physrevc.48.889

Cited by 70 publications

(76 citation statements)

References 25 publications

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“…Furthermore, various investigators have extended relativistic phenomenology to the study of hypernuclear physics [123][124][125][126][127][128][129][130][131][132][133]. In these relativistic models, the hyperon propagating in the nuclear medium is described by a Dirac equation with scalar and vector potentials.…”

Section: A Overviewmentioning

confidence: 99%

See 1 more Smart Citation

QCD sum rules and applications to nuclear physics

Cohen

Furnstahl

Griegel

et al. 1995

Progress in Particle and Nuclear Physics

175

300

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Applications of QCD sum-rule methods to the physics of nuclei are reviewed, with an emphasis on calculations of baryon self-energies in infinite nuclear matter. The sum-rule approach relates spectral properties of hadrons propagating in the finite-density medium, such as optical potentials for quasinucleons, to matrix elements of QCD composite operators (condensates). The vacuum formalism for QCD sum rules is generalized to finite density, and the strategy and implementation of the approach is discussed. Predictions for baryon self-energies are compared to those suggested by relativistic nuclear physics phenomenology. Sum rules for vector mesons in dense nuclear matter are also considered.

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Section: A Overviewmentioning

confidence: 99%

“…While experimental evidence of Σ hypernuclei is lacking at present, a number of authors have extended the relativistic phenomenology to Σ hypernuclei and presented theoretical predictions [128][129][130][131]. In Refs.…”

Section: A Overviewmentioning

confidence: 99%

QCD sum rules and applications to nuclear physics

Cohen

Furnstahl

Griegel

et al. 1995

Progress in Particle and Nuclear Physics

175

300

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“…Properties of hypernuclei with S = −1 are investigated in the RMFT in [Co93,Gl93,Do95,Lo95]. The two primary systematic features of Λ hypernuclei are the relatively small depth of the central potential and the small spin-orbit splittings.…”

Section: Strangeness In Nucleimentioning

confidence: 99%

Recent Progress in Quantum Hadrodynamics

Serot

Walecka

1997

Int. J. Mod. Phys. E

987

1,511

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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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“…As proved by prior studies [8], such prescriptions on the in-medium effects are still reasonable for exploring the EoS at supranuclear density as well as in describing the neutron stars. In the CDF calculations if not specified the proportions between meson-Λ and meson-nucleon couplings are fixed as g σ-Λ /g σ = 0.600 and g ω-Λ /g ω = 0.653 [41], and the masses of Λ-hyperon, electron, and muon are chosen as M Λ = 1115.0 MeV, m e = 0.511 MeV, and m µ = 105.7 MeV. In the Lagrangian density (1) we ne- ( a ) glect the strangeness concerned baryon-baryon interactions, which still remain to be an open question.…”

mentioning

confidence: 99%

Hyperon effects in covariant density functional theory and recent astrophysical observations

et al. 2012

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Motivated by recent observational data, the equations of state with the inclusion of strangenessbearing Λ-hyperons and the corresponding properties of neutron stars are studied, based on the covariant density functional (CDF) theory. To this end, we specifically employ the density dependent relativistic Hartree-Fock (DDRHF) theory and the relativistic mean field theory (RMF). The inclusion of Λ-hyperons in neutron stars shows substantial effects in softening the equation of state. Because of the extra suppression effect originated from the Fock channel, large reductions on both the star mass and radius are predicted by the DDRHF calculations. It is also found that the mass-radius relations of neutron stars with Λ-hyperons determined by DDRHF with the PKA1 parameter set are in fairly good agreement with the observational data where a relatively small neutron stars radius is required. Therefore, it is expected that the exotic degrees of freedom such as the strangeness-bearing structure may appear and play significant roles inside the neutron stars, which is supported further by the systematical investigations on the consistency between the maximum neutron star mass and Λ-coupling strength. As the natural laboratories in the universe for nuclear and particle physics, neutron stars [1] have fascinated much effort concentrated on exploring the equation of state (EoS) of baryonic matter at low temperature and high density [2,3]. Specifically the mass of the observed neutron stars brings a strong constraint on the behavior of EoS at supranuclear density. The most precise measurements for the neutron star mass are determined to be less than 1.5M from the timing observations of radio binary pulsars [4], which has remained for many years to constraint the EoS. However, the existence of more massive compact stars is now unveiled by some evidence [5]. In a survey with the Arecibo telescope, an eccentric binary millisecond pulsar PSR J1903+0327 was found with an unusually high mass value (1.74 ± 0.04)M [6]. Recently a much larger pulsar mass of (1.97 ± 0.04)M was measured using Shapiro delay for the binary millisecond pulsar J1614-2230 [7]. All of these new data imply a stiff EoS of strongly interacting matter at high densities, which need further check on the new developed land-and space-based observatories.So far, there still exists considerable theoretical uncertainty on the EoS at supranuclear densities due to the poorly constrained many-body interaction, consequently deducing very different maximum mass and radius for a beta-stable neutron star. As indicated by prior study of neutron star based on the density dependent relativistic Hartree-Fock (DDRHF) theory [8], the maximum mass predicted by the covariant density functional (CDF) cal- * Electronic address: longwh@lzu.edu.cn culations [9,10] lies between 2M and 2.8M . The Corresponding EoSs deviate remarkably from each other at high density region. In the center of neutron stars, the density is generally considered as high as 5 to 10 times the nuclear equilibrium (satu...

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Relativistic mean-field calculations of Λ and Σ hypernuclei

Cited by 70 publications

References 25 publications

QCD sum rules and applications to nuclear physics

QCD sum rules and applications to nuclear physics

Recent Progress in Quantum Hadrodynamics

Hyperon effects in covariant density functional theory and recent astrophysical observations

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