Constraints on the nuclear symmetry energy from asymmetric-matter calculations with chiral 
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 interactions

Somasundaram, Rahul; Drischler, C.; Tews, Ingo; Margueron, J.

doi:10.1103/physrevc.103.045803

Cited by 42 publications

(37 citation statements)

References 84 publications

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“…Note, however, that the FFG already contributes to the nonquadratic terms [e.g., S FFG 4 (n) 0.45 MeV × (n/n 0 ) 2/3 ]. Parametric fits to microscopic ANM calculations have been used to investigate the nonquadratic contributions and found them to be relatively small (56,68,69,98). Recently, however, Kaiser (99) has shown that MBPT at second order gives rise to additional logarithmic contributions ∼δ 2l ln |δ| with l ≥ 2.…”

Section: Nuclear Symmetry Energy and The Isospin Asymmetry Expansionmentioning

confidence: 99%

Chiral Effective Field Theory and the High-Density Nuclear Equation of State

Drischler

Holt

Wellenhofer

2021

Annu. Rev. Nucl. Part. Sci.

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123

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Born in the aftermath of core-collapse supernovae, neutron stars contain matter under extraordinary conditions of density and temperature that are difficult to reproduce in the laboratory. In recent years, neutron star observations have begun to yield novel insights into the nature of strongly interacting matter in the high-density regime where current theoretical models are challenged. At the same time, chiral effective field theory has developed into a powerful framework to study nuclear matter properties with quantified uncertainties in the moderate-density regime for modeling neutron stars. In this article, we review recent developments in chiral effective field theory and focus on many-body perturbation theory as a computationally efficient tool for calculating the properties of hot and dense nuclear matter. We also demonstrate how effective field theory enables statistically meaningful comparisons among nuclear theory predictions, nuclear experiments, and observational constraints on the nuclear equation of state. Expected final online publication date for the Annual Review of Nuclear and Particle Science, Volume 71 is September 2021. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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Section: Nuclear Symmetry Energy and The Isospin Asymmetry Expansionmentioning

confidence: 99%

Chiral Effective Field Theory and the High-Density Nuclear Equation of State

Drischler

Holt

Wellenhofer

2021

Annu. Rev. Nucl. Part. Sci.

Self Cite

123

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“…[31,32] (See also Refs. [33,34]). This is a density functional approach that allows one to incorporate nuclear physics knowledge encoded in the Nuclear Empirical Parameters (NEPs).…”

mentioning

confidence: 99%

Impact of massive neutron star radii on the nature of phase transitions in dense matter

Somasundaram,

Margueron

2021

Preprint

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The last few years have seen tremendous progress in the observation of the global properties of neutron stars (NSs), e.g. masses, radii and tidal deformabilities. Such properties provide information about possible phase transitions in the inner cores of NSs, provided the connection between observed masses and radii and the equation of state (EoS) is well understood. We focus the present study on first-order phase transitions, which often softens the EoS and consequently reduces the maximum mass as well as the radii of NSs. Here, we challenge this conventional expectation by constructing explicit examples of EoSs undergoing a first-order phase transition, but which are much stiffer that their purely hadronic counterparts. We also provide comparisons with the recently proposed quarkyonic EoS which suggests a strong repulsion in the core of NSs, and we show that their stiffness can be realistically masqueraded by first-order phase transitions to exotic matter.

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“…This extension has already been presented in Ref. [25]. The low density correction to the energy is now controlled by the function b(δ) = b sat + b sym δ 2 instead of the parameter b.…”

Section: Homogeneous Mattermentioning

confidence: 81%

“…In order to obtain the parameters κ sat and κ sym for the Hamiltonians we consider here, we first derive the density dependent Landau effective mass for neutrons from its single-particle spectrum, as it was done in Ref. [25]. Then Eq.…”

Section: Homogeneous Mattermentioning

confidence: 99%

Properties of the neutron star crust: Quantifying and correlating uncertainties with improved nuclear physics

Grams,

Somasundaram,

Margueron

et al. 2021

Preprint

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A compressible liquid-drop model (CLDM) is used to correlate uncertainties associated with the properties of the neutron star (NS) crust with theoretical estimates of the uncertainties associated with the equation of state (EOS) of homogeneous neutron and nuclear matter. For the latter, we employ recent calculations based on Hamiltonians constructed using Chiral Effective Field theory (χEFT). Fits to experimental nuclear masses are employed to constrain the CLDM further, and we find that they disfavor some of the χEFT Hamiltonians. The CLDM allows us to study the complex interplay between bulk, surface, curvature, and Coulomb contributions, and their impact on the NS crust. It also reveals how the curvature energy alters the correlation between the surface energy and the bulk symmetry energy. Our analysis quantifies how the uncertainties associated with the EOS of homogeneous matter implies significant uncertainties for the composition of the crust, its proton fraction, and the volume fraction occupied by nuclei. We find that the finite-size effects impact the crust composition, but have a negligible effect on the net isospin asymmetry of matter. The isospin asymmetry is largely determined by the bulk properties and the isospin dependence of the surface energy. The most significant uncertainties associated with matter properties in the densest regions of the crust, the precise location of the crust-core transition, are found to be strongly correlated with uncertainties associated with the Hamiltonians. By adopting a unified model to describe the crust and the core of NSs, we tighten the correlation between their global properties such as their mass-radius relationship, moment of inertia, crust thickness, and tidal deformability with uncertainties associated with the nuclear Hamiltonians.

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Constraints on the nuclear symmetry energy from asymmetric-matter calculations with chiral NN and 3N interactions

Cited by 42 publications

References 84 publications

Chiral Effective Field Theory and the High-Density Nuclear Equation of State

Chiral Effective Field Theory and the High-Density Nuclear Equation of State

Impact of massive neutron star radii on the nature of phase transitions in dense matter

Properties of the neutron star crust: Quantifying and correlating uncertainties with improved nuclear physics

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