Autor(es)

Lenzi, C. H. ; Lugones, G. ; Vasquez, C.

• Tipo de documento: Artigo Científico
• Fonte: PHYSICAL REVIEW D; v. 107, n. 8, p. 12-pg., 2023-04-19.

Resumo

It has been shown recently that quark-hadron conversions at the interface of a hybrid star may have a key role on the dynamic stability of the compact object. In this work we perform a systematic study of hybrid stars with reactive interfaces using a model-agnostic piecewise-polytropic hadronic equation of state and the Nambu-Jona-Lasinio (NJL) model for three-flavor quark matter. For the hadronic phase we use a soft, an intermediate and a stiff parametrization that match at 1.1n0 with predictions based on chiral effective field theory (cEFT) interactions. In the NJL Lagrangian we include scalar, vector and 't Hooft interactions. The vector coupling constant gv is treated as a free parameter. We also consider that there is a split between the deconfinement and the chiral phase transitions which is controlled by changing the conventional value of the vacuum pressure -Omega(0) in the NJL thermodynamic potential by -(Omega(0) + delta Omega(0) ) , being delta Omega(0) a free parameter. We analyze the mass-radius (M-R) relation in the case of rapid (tau << 1 ms) and slow (tau >> 1 ms) conversions, being tau the reaction timescale. In the case of slow interface reactions we find M-R curves with a cusp at the maximum mass point where a pure hadronic branch and a slow-stable hybrid star (SSHS) branch coincide. We find that the length of the slow-stable branch grows with the increase of the transition density and the energy density jump at the hadron-quark interface. We calculate the tidal deformabilities of SSHSs and analyze them in the light of the GW170817 event. (AU)

• Processo FAPESP: 22/02341-9 - Equação de estado da matéria sob condições extremas: modelos e aplicações
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• Modalidade de apoio: Auxílio à Pesquisa - Regular
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• Modalidade de apoio: Auxílio à Pesquisa - Regular