تقرير
Hybrid stars with reactive interfaces: analysis within the Nambu-Jona-Lasinio model
| العنوان: | Hybrid stars with reactive interfaces: analysis within the Nambu-Jona-Lasinio model |
|---|---|
| المؤلفون: | Lenzi, C. H., Lugones, G., Vasquez, C. |
| سنة النشر: | 2023 |
| المجموعة: | Astrophysics High Energy Physics - Phenomenology Nuclear Theory |
| مصطلحات موضوعية: | Nuclear Theory, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Solar and Stellar Astrophysics, High Energy Physics - Phenomenology |
| الوصف: | 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 model for three-flavor quark matter. For the hadronic phase we use a soft, an intermediate and a stiff parametrization that match at $1.1 n_0$ {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 $g_{v}$ 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 $-\left(\Omega_{0}+\delta \Omega_{0}\right)$, being $\delta \Omega_{0}$ a free parameter. We analyze the mass-radius ($M$-$R$) relation in the case of rapid ($\tau \ll 1 \, \mathrm{ms}$) and slow ($\tau \gg 1 \, \mathrm{ms}$) 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 analyse them in the light of the GW170817 event. Comment: 12 pages, 4 figures, to be published in Physical Review D |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevD.107.083025 |
| URL الوصول: | http://arxiv.org/abs/2304.01898 |
| رقم الأكسشن: | edsarx.2304.01898 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevD.107.083025 |
|---|