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Many-body forces in the equations of state of hyperonic matter

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Many-body forces in the equations of state of hyperonic matter

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Título Many-body forces in the equations of state of hyperonic matter
Autor Gomes, Rosana de Oliveira
Dexheimer, Veronica Antocheviz
Schramm, Stefan
Vasconcellos, Cesar Augusto Zen
Abstract In this work we introduce an extended version of the formalism proposed originally by Taurines et al. that considers the effects of many-body forces simulated by nonlinear self-couplings and meson–meson interaction contributions. In this extended version of the model, we assume that matter is at zero temperature, charge neutral, and in beta-equilibrium, considering that the baryon octet interacts by the exchange of scalar–isoscalar (σ, s*), vector–isoscalar (ω, ϕ), vector–isovector ( ), and scalar–isovector (δ) meson fields. Using nuclear matter properties, we constrain the parameters of the model that describe the intensity of the indirectly density dependent baryon–meson couplings to a small range of possible values. We then investigate asymmetric hyperonic matter properties. We report that the formalism developed in this work is in reasonable agreement with experimental data and also allows for the existence of massive hyperon stars (with more than 2 M) with small radii, compatible with astrophysical observations.
Contido em The astrophysical journal. Bristol. Vol. 808, no. 1 (July 2015), 8, 21 p.
Assunto Densidade nuclear
Dimensões estelares
Equacoes de estado
Forcas nucleares
Massa estelar
Materia nuclear
[en] Dense matter
[en] Equation of state
[en] Stars: interiors
[en] Stars: neutron
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/126990
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