Neutron stars within a relativistic mean field theory compatible with nucleon-nucleon short-range correlations

Li, Zhen; Ren, Zhongzhou; Hong, B.; Lu, Hao; Bai, Dong

doi:10.1016/j.nuclphysa.2019.07.002

Cited by 10 publications

(7 citation statements)

References 64 publications

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“…Non-independent nucleons correlate in pairs with high relative momentum due to the shortrange components of the nuclear interaction. These correlations are called short-range correlations (SRC) [12][13][14][15][16][17][18][19][20][21][22][23][24][25]. Experiments performed at the Thomas Jefferson National Accelerator Facility (JLab) concluded that for the 12 C nucleus, 20% of the nucleons present SRC and, within this set, 90% of the correlated pairs are neutronproton (np) type [26].…”

Section: Introductionmentioning

confidence: 99%

Short-range correlations effects on the deformability of neutron stars

Souza,

Dutra,

Lenzi

et al. 2020

Preprint

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In the present work, we investigate the effects of short-range correlations (SRC) on the dimensionless deformability of the binary neutron system related to the GW170817 event. We implemented phenomenological SRC in a relativistic mean-field model in which the bulk parameters, namely, incompressibility (K0), effective nucleon mass ratio (m * ), symmetry energy (J) and its slope (L0), are independently controlled. Our results point out that the SRC favor the model to pass through the constraints, established by the LIGO/Virgo Collaboration, on the values of Λ1.4 and on the Λ1 × Λ2 region. We also found a clear linear correlation between Λ1.4 with K0 and L0 (increasing dependence), and with m * and J (decreasing dependence). Finally, we also obtained compatible numbers for R1.4 (model with and without SRC) in comparison with recent data from the Neutron Star Interior Composition Explorer (NICER) mission.

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Section: Introductionmentioning

confidence: 99%

Short-range correlations effects on the deformability of neutron stars

Souza,

Dutra,

Lenzi

et al. 2020

Preprint

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“…The coupling used here between the Higgs and the neutralino is compatible with experimental boundaries provided by PandaX-II [98], LUX [99], and DarkSide [100] collaborations for the spin-independent scattering cross-sections. For the hadronic sector, we use a relativistic mean-field model that takes into account the phenomenology of short-range correlations [66][67][68][69][70][71][72][73][74][75][76][77][78][79], implemented through the modification of the momentum distribution function, replaced by the one predicting a high momentum tail proportional to 1/k 4 [82,83].…”

Section: Summary and Concluding Remarksmentioning

confidence: 99%

“…Furthermore, other source of valuable information regarding the nuclear interaction comes from microscopic calculations based on the chiral effective field theory (EFT) [55][56][57][58][59][60][61][62][63][64][65]. Here we use the RMF approach, but for the hadronic sector of the combined description (DM + nuclear matter) we generalize the model in order to include effects from nucleonnucleon short-range correlations (SRC) [66][67][68][69][70][71][72][73][74][75][76][77][78][79]. This phenomenology establishes that nonindependent nucleons correlate in pairs with high relative momentum as a consequence of the short-range part of the nuclear interaction.…”

Section: Introductionmentioning

confidence: 99%

Dark matter component in hadronic models with short-range correlations

Lourenço,

Frederico,

Dutra

2021

Preprint

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A relativistic mean field hadronic model with a dark matter (DM) particle coupled to nucleons including short-range correlations (SRC) is applied to study neutron stars (NS). The lightest neutralino is chosen as the dark particle candidate, which interacts with nucleons by the exchange of Higgs bosons. A detailed thermodynamical analysis shows that the contribution of the DM fermions to the energy density of the matter composed by these particles and nucleons is completely dominated by the DM kinetic terms. The model reproduces satisfactorily the constraints on the mass-radius diagram obtained from the analysis of the combined data from the NICER mission, LIGO collaboration, and mass measurements from radio observations. We show that the SRC balance the reduction of the neutron star mass due to the DM component, and because of that the model is able to present more massive NS. We also present a study of the effect, in the NS massradius profiles, of the uncertainties in some bulk parameters related to the hadronic sector. We find that it is possible to generate parametrizations, with DM content, compatible with the recent astrophysical constraints and with the uncertainty in the symmetry energy slope obtained from the results reported by the updated Lead Radius EXperiment (PREX-2).

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“…A σ-ω modellben az M -R görbe alakját és a maximális neutroncsillag tömeget a nukleonok maganyagon belüli, eektív tömege nagy mértékben befolyásolja. Más modellekre vonatkozó vizsgálatokban is hasonló viselkedés tapasztalható, így feltételezhet®, hogy ez nem csak a σ-ω modell jellemz®je, hanem általánosabb jelenség [90,91]. A σ-ω modellre vonatkozó vizsgálatomban végigkövethet®, hogy a paraméterek viselkedése hogyan vezet a fentebb említett következtetésekre, és így utat mutathat a álarc probléma kezeléshez a vizsgálatok és a modellalkotás során.…”

Section: 25)unclassified

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Pósfay¹

2019

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Neutron stars within a relativistic mean field theory compatible with nucleon-nucleon short-range correlations

Cited by 10 publications

References 64 publications

Short-range correlations effects on the deformability of neutron stars

Short-range correlations effects on the deformability of neutron stars

Dark matter component in hadronic models with short-range correlations

Térelméleti módszerek az asztrofizikában

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