Relativistic Klein-Gordon systems

Chung, K. C.; Kodama, T.; Teixeira, A. F. da F.

doi:10.1103/physrevd.16.2412

Cited by 11 publications

(3 citation statements)

References 4 publications

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“…The σ-ρ-ω model with excludent volume calculation for r = 0.72 fm leads to M NS = 1.85M , whereas a more realistic calculation, by using a nuclear Thomas-Fermi equation of state, gives a maximum mass of neutron stars equal to 3.26M . [37] However the light neutron stars mass requires higher r values around 0.9 fm. For a different parameter sets the consequences for nuclear matter properties due to the excluded volume effects have been investigated.…”

Section: Discussionmentioning

confidence: 99%

Nucleon Finite Volume Effect and Nuclear Matter Properties in a Relativistic Mean-Field Theory

Costa

Santiago

Rodrigues³

et al. 2006

Commun. Theor. Phys.

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Effects of excluded volume of nucleons on nuclear matter are studied, and the nuclear properties that follow from different relativistic mean-field model parametrizations are compared. We show that, for all tested parametrizations, the resulting volume energy a1 and the symmetry energy J are around the acceptable values of 16 MeV and 30 MeV, and the density symmetry L is around 100 MeV. On the other hand, models that consider only linear terms lead to incompressibility K0 much higher than expected. For most parameter sets there exists a critical point (ρc,δc), where the minimum and the maximum of the equation of state are coincident and the incompressibility equals zero. This critical point depends on the excluded volume parameter r. If this parameter is larger than 0.5 fm, there is no critical point and the pure neutron matter is predicted to be bound. The maximum value for neutron star mass is 1.85M⊙, which is in agreement with the mass of the heaviest observed neutron star 4U0900-40 and corresponds to r = 0.72 fm. We also show that the light neutron star mass (1.2M⊙) is obtained for r≃0.9 fm.

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Section: Discussionmentioning

confidence: 99%

Nucleon Finite Volume Effect and Nuclear Matter Properties in a Relativistic Mean-Field Theory

Costa

Santiago

Rodrigues³

et al. 2006

Commun. Theor. Phys.

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“…Static scalar polarizability of 2 3 S 1 and 2 1 S 0 metastable helium was measured by the electric deflection time-of-flight method in [18]. Dynamic polarizabilities of these helium states were calculated in [19] using a variation-perturbation scheme. Rigorous upper and lower bonds for polarizabilities of excited states of two-electron atoms were calculated in [20].…”

Section: Introductionmentioning

confidence: 99%

Dynamic polarizabilities of atoms in their low-excited states: He, Be, Mg and Ca

Chernov

Dorofeev

Kretinin

et al. 2005

J. Phys. B: At. Mol. Opt. Phys.

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The quantum defect Green function formalism is applied to calculate the dynamic scalar and tensor polarizabilities of some atoms in their excited states (21S, 23S, 21P and 23P for He, 21P and 23P for Be, 33P for Mg and 43P for Ca). Experimental and calculated oscillator strength values were used to provide an account for low-excited states (reduce–adding correction of the Green function) while the high-excited and continuum states are accounted semi-analytically. The calculated polarizability values are in good (within several per cent) agreement with the available experimental data and the ab initio numerical data.

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“…However, there are soliton solutions without an explicit conserved Noether current. 5 The interest on such solitonic configurations relies on the problem of dark matter in cosmology, because the visible and baryonic matter can account for only a small fraction of the total mass of the Universe. Then, a possible solution of this problem is to consider that the dark matter is nonbaryonic in the form of soliton configuration such as scalar soliton stars, oscillating soliton stars, boson stars, Q-balls 6 and nontopological solitons that can arise in a second-order phase transition in the early universe.…”

Section: Introductionmentioning

confidence: 99%

On solitons with nonminimally coupled scalar fields

Castellani

Oliveira

2002

Journal of Mathematical Physics

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A nonsingular static and spherically symmetric space–time endowed with nonminimally coupled scalar field described by the action S=∫d4 x (−g/2)(R−gαβφ,α φ,β−ξ R φ2) is presented for the case in which the coupling parameter ξ>1/6. This solitonlike space–time is obtained using the technique of conformal transformation that associates solutions produced by ordinary scalar fields in general relativity with those with nonminimally coupled scalar fields. The dynamical stability of the solution is examined through the Galerkin method.

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Relativistic Klein-Gordon systems

Cited by 11 publications

References 4 publications

Nucleon Finite Volume Effect and Nuclear Matter Properties in a Relativistic Mean-Field Theory

Nucleon Finite Volume Effect and Nuclear Matter Properties in a Relativistic Mean-Field Theory

Dynamic polarizabilities of atoms in their low-excited states: He, Be, Mg and Ca

On solitons with nonminimally coupled scalar fields

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