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A Density-dependent van der Waals Model under the GW170817 Constraint

2019; IOP Publishing; Volume: 882; Issue: 1 Linguagem: Inglês

10.3847/1538-4357/ab3122

ISSN

1538-4357

Autores

O. Lourenço, M. Dutra, César H. Lenzi, M. Bhuyan, S. K. Biswal, B. M. Santos,

Tópico(s)

High-pressure geophysics and materials

Resumo

Abstract We propose a density-dependent function for the attractive interaction in the original van der Waals model to correctly describe the flow constraint at the high-density regime of the symmetric nuclear matter. After a generalization to asymmetric nuclear matter, it was also possible to study the stellar matter regime from this new model. The mass–radius relation for neutron stars under β -equilibrium is found to agree with recent X-ray observations. The neutron-star masses supported against gravity, obtained from some parameterizations of the model, are in the range of (1.97–2.07) M ⊙ , compatible with observational data from the PSR J0348+0432 pulsar. Furthermore, we verify the reliability of the model in predicting tidal deformabilities of the binary system related to the GW170817 neutron-star merger event and find a full agreement with the new bounds obtained by the LIGO/Virgo collaboration.

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