Quark cores in extensions of the MIT bag model

Joshi, Salil; Sau, Sovan; Sanyal, Sankar P.

doi:10.1016/j.jheap.2021.03.001

Cited by 6 publications

(3 citation statements)

References 43 publications

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“…[10] for a historical review. In astrophysics, under the framework of the bag model, the strange stars, neutron stars, and quark cores are viewed as large bags containing countless quarks [11][12][13][14][15]. Despite these advances, the bag model has little application in the particle decay system, mainly because of the center of mass motion (CMM) [16][17][18].…”

Section: ξ Bbmentioning

confidence: 99%

Center of mass motion in bag model

Liu

Geng

2023

Chinese Phys. C

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Despite the great success on the mass spectra, the reputation of the bag model has been closely followed by the embarrassment from the center of mass motion. It leads to severe theoretical inconsistencies. For instance, the masses and the decay constants would no longer be independent of the momentum. In this work, we provide a systematical approach to resolve this problem. The meson decay constants as well as the baryon transition form factors can be computed consistently in our framework. Notably, the form factors in the neutron $\beta$ decays do not depend on any free parameters, and are determined to be $F^V_1 =1 $ and $F^A_1 = 1.31$ or $F_1^A/F_1^V= 1.31$, which is close the experimental value of $F^A_1/F^V_1 = 1.27$. In addition, we find that ${\cal B} (\Lambda_b \to \Lambda \gamma) = (6.8 \pm 3.3 ) \times 10^{-6} $, which agrees to the experimental value of $(7.1\pm 1.7)\times 10^{-6}$. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.

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Section: ξ Bbmentioning

confidence: 99%

Center of mass motion in bag model

Liu

Geng

2023

Chinese Phys. C

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“…1 Various approaches have been attempted for a model description of self-bound quark matter (Xia et al 2021) since it is not attainable directly by solving QCD (Kurkela et al 2010(Kurkela et al , 2014Gorda et al 2018). Among them, the MIT bag model is the most widely-used (see some latest studies in e.g., Roupas et al 2021;Lopes et al 2021;Joshi et al 2021). Others include the Nambu-Jona-Lasinio (NJL) model (Buballa 2005), the density-dependent quark masses (Li et al 2010(Li et al , 2011, a confining quark matter model (Dey et al 1998;Chu & Chen 2017), an interacting quark matter (Zhang & Mann 2021) and the vector interaction enhanced bag model (Klähn & Fischer 2015) for an incomplete list.…”

Section: Normal and Cfl Sqs Modelsmentioning

confidence: 99%

Bayesian inference of strange star equation of state using the GW170817 and GW190425 data

Miao,

Jiang,

et al. 2021

Preprint

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The observations of compact star inspirals from LIGO/Virgo provide a valuable tool to study the highly uncertain equation of state (EOS) of dense matter at the densities in which the compact stars reside. It is not clear whether the merging stars are neutron stars or quark stars containing self-bound quark matter. In this work, we explore the allowed bag-model-like EOSs for the possibility of the latter by assuming the merging stars are strange quark stars (SQSs) from a Bayesian analysis employing the tidal deformability observational data of the GW170817 and GW190425 binary mergers. We consider two extreme states of strange quark matter, either in nonsuperfluid or color-flavor locked (CFL) and find the results in these two cases essentially reconcile. In particular, our results indicate that the sound speed in the SQS matter is approximately a constant close to the conformal limit of c/ √ 3. The universal relations between the mass, the tidal defromability and the compactness are provided for the SQSs. The most probable values of the maximum mass are found to be M TOV = 2.10 +0.12 −0.12 (2.15 +0.16 −0.14 ) M for normal (CFL) SQSs at 90% confidence level. The corresponding radius and tidal deformability for a 1.4 M star are R 1.4 = 11.50 +0.52 −0.55 (11.42 +0.52 −0.44 ) km and Λ 1.4 = 650 +230 −190 (630 +220 −150 ), respectively. We also investigate the possibility of GW190814's secondary component m 2 of mass 2.59 +0.08 −0.09 M as a SQS, and find that it could be a CFL SQS with the pairing gap ∆ larger than 244 MeV and the effective bag parameter B 1/4 eff in the range of 170 to 192 MeV, at 90% confidence level.

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“…Até aqui, consideramos que as estrelas de nêutrons são constituídas inteiramente por matéria de quarks. Neste caso, elas são chamadas de estrelas de quarks [11,12,13,14,15]. Entretanto, não há um consenso em relação a fase em que a matéria se apresenta no interior das estrelas de nêutrons.…”

Section: Estrelas De Nêutronsunclassified

Natureza da transição de fase quark-hádron e consequências para a estrutura estelar

Albino¹

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Neutron stars are the second most dense objects in the universe (only less dense than black holes) and have a relatively low temperature. Because of these features, neutron star matter lies in a poorly understood region of the QCD phase diagram. Neutron stars can work as laboratories for the study of cold and dense matter.In this work, we used the MFTQCD (Mean-Field Theory of Quantum Chromodynamics) and we obtained the mass-radius diagram and the tidal deformability. Comparing these results with the experimental data, we conclude that the MFTQCD remains a good model to describe the properties of neutron stars; however, the parameter window is now narrower. Next, we studied the impact of the nature of the phase transition on neutron star properties. We used an equation of state which combines hadronic matter and quark matter. We control the smoothness of the quark-hadron transition by varying the free parameter ρ c . Our results indicate that a sharp phase transition is more compatible with experimental data.

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Quark cores in extensions of the MIT bag model

Cited by 6 publications

References 43 publications

Center of mass motion in bag model

Center of mass motion in bag model

Bayesian inference of strange star equation of state using the GW170817 and GW190425 data

Natureza da transição de fase quark-hádron e consequências para a estrutura estelar

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