Feasibility of constraining the curvature parameter of the symmetry energy using elliptic flow data

Cozma, M.D.

doi:10.1140/epja/i2018-12470-1

Cited by 60 publications

(81 citation statements)

References 112 publications

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“…[10]. At this point we recall that large values of L are still compatible with the Lead Radius Experiment ("PREX") [59], and recent analysis of elliptic flow in heavy ion collisions [60]. The models in the second class are mainly kept for the sake of completeness and because some of the models in the first class have been derived from them by introducing additional meson couplings.…”

Section: A Nucleonic Eosmentioning

confidence: 74%

Relativistic hypernuclear compact stars with calibrated equations of state

et al. 2020

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Within the covariant density functional theory of hypernuclear matter we build a series of equations of state for hypernuclear compact stars, by calibrating the coupling constants of the Ξ-hyperon to the experimental binding energy of the single-Ξ hypernuclei 15 Ξ − C and 12 Ξ − Be. Coupling constants of the Λ-hyperon to nucleons have been calibrated on a vast collection of experimental data on single Λ-hypernuclei and we employ those values. Uncertainties on the couplings of the Σ-hyperon to nuclear matter, due to lack of experimental data, are accounted for by allowing for a wide variation of the well depth of Σ at rest in symmetric saturated nuclear matter. To account for uncertainties in the nucleonic sector at densities much larger than n 0 , a rich collection of parametrizations is employed, some of them in agreement with existing constraints from nuclear physics and astrophysics. Neutron star properties are investigated with all these calibrated equations of state. The effects of the presence of hyperons on the radius, on the tidal deformability, on the moment of inertia, and on the nucleonic direct Urca process are discussed. The sensitivity of the hyperonic direct Urca processes to uncertainties in the nucleonic and hyperonic sectors is also addressed. It is shown that the relative variations of the radius, tidal deformability and moment of inertia from the values that characterize purely nucleonic stars are linearly correlated with the strangeness fraction. The maximum radius deviation, obtained for most massive neutron stars, is ≈ 10%. The reduction of the maximum mass, triggered by nucleation of strangeness, is estimated at ≈ 15 − 20%, out of which 5% comes from insufficient information on the Σ-hyperon interactions. A total of 44 calibrated hyperonic equations of state are published as Supplemental Material.

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Section: A Nucleonic Eosmentioning

confidence: 74%

Relativistic hypernuclear compact stars with calibrated equations of state

et al. 2020

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“…The different sensitivities probed by flow ratios of neutrons with respect to protons and with respect to light charged particles provide access to the curvature parameter K sym . Determined with the existing data, the uncertainty of K sym is still large but errors close to ±150 MeV may be ultimately within reach [22]. The presented experimental results and theoretical studies thus provide a strong encouragement for the continuation of flow measurements of the present kind with improved detection systems at FAIR, the Facility for Antiproton and Ion Research [92,93].…”

Section: Discussionmentioning

confidence: 74%

“…A density dependent term was added to the MDI force, leading to a new force MDI2 with an additional parameter y that, together with the original x of MDI, permitted choosing the slope and curvature parameters L and K sym of the symmetry energy independently. By lifting the correlation of these two parameters, present in most models, uncertainties in the short-range three-body force are admitted and thereby taken into account [22]. The crossing of the various options was moved from the saturation density to the density 0.1 fm −3 and placed at 25.5 MeV, i.e.…”

Section: Towards Model Independence With Mdi2mentioning

confidence: 99%

“…Only the error band corresponding to the former data set (hashed) is shown in the figure (from Ref. [22], reprinted with kind permission from Springer Science+Business Media).…”

Section: Neutron Star Radiimentioning

confidence: 99%

“…The sensitivity to density increases slowly but can be expected to be centered near twice saturation at these energies [53]. Energies lower than 400 MeV/nucleon have also been suggested as useful for the determination of the curvature term in the asymmetric-matter EoS [22]. With measurements at several energies, as proposed to be conducted at FAIR [92], the analysis within transport-model descriptions will be more stringently tested.…”

Section: Future Opportunitiesmentioning

confidence: 99%

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High density with elliptic flows

Trautmann¹

2019

AIP Conference Proceedings

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The elliptic flow of emitted particles and fragments observed in heavy-ion reactions at high energy has become an important observable reflecting the pressure generated in the dense collision zone. More recently, the strength of the nuclear symmetry energy has been investigated by measuring the ratios or differences of the elliptic flows exhibited by neutrons and charged particles in 197 Au+ 197 Au collisions at 400 MeV/nucleon incident energy at the GSI laboratory. A moderately soft to linear dependence on density was deduced for a range of densities shown to reach beyond twice the saturation value in these experiments. The known sources of uncertainties and possible model dependencies were thoroughly studied with transport models of the UrQMD and Tübingen QMD type.A new source of information on the nuclear equation of state at high density has opened up with the observation of the first LIGO and Virgo GW170817 gravitational wave signal from a neutron star merger. The quantitative comparison of terrestrial and celestial results on the basis of measured or inferred neutron star radii or core pressures, including those obtained from X-ray observations, reveals a rather satisfactory agreement. Depending on the precision that can be achieved with future measurements and observations, it will thus become possible to assess the validity of the applied models and methods. The perspectives for improved experiments at FAIR using the NeuLAND and KRAB detection systems are outlined. *

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Collective Motion and the Asymmetric-Matter Equation-of-State

Trautmann

2020

Discoveries at the Frontiers of Science

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Feasibility of constraining the curvature parameter of the symmetry energy using elliptic flow data

Cited by 60 publications

References 112 publications

Relativistic hypernuclear compact stars with calibrated equations of state

Relativistic hypernuclear compact stars with calibrated equations of state

High density with elliptic flows

Collective Motion and the Asymmetric-Matter Equation-of-State

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