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Hyperon-nucleon three-body forces and strangeness in neutron stars
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abstract
Three-body forces acting on a $\Lambda$ hyperon in a nuclear medium are investigated, with special focus on the so-called hyperon puzzle in neutron stars. The hyperon-nucleon two-body interaction deduced from SU(3) chiral effective field theory is employed at next-to-leading order. Hyperon-nucleon three-body forces are approximated using saturation by decuplet baryons and are transcribed to density-dependent effective two-body interactions. These together are taken as input in a Brueckner-Bethe-Goldstone equation with explicit treatment of the $\Lambda N\leftrightarrow\Sigma N$ and $\Lambda NN\leftrightarrow\Sigma NN$ coupled channels. Single-particle potentials of a $\Lambda$ hyperon in symmetric nuclear matter and neutron matter are calculated. With parameters of the $\Lambda NN$ three-body force constrained by hypernuclear phenomenology, extrapolations to high baryon density are performed. By comparison of the $\Lambda$ and neutron chemical potentials at densities characteristic of the core of neutron stars it is found that the combined repulsive effects of two- and three-body correlations makes the appearance of $\Lambda$ hyperons in neutron stars energetically unfavourable, thus offering a possible solution to a longstanding question.
Forward citations
Cited by 7 Pith papers
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In-medium hyperon potentials and the quarkyonic hyperon onset: charged $\Sigma$'s in $\beta$-equilibrium and the neutrino connection
In-medium potentials give the quarkyonic hyperon onset weight-2 leverage on U_Y, ban Σ⁻ in β-equilibrium, keep TOV softening ≲0.025 M_⊙, and leave core strangeness prior-dominated once neutrino FSI pin U_Λ(n0).
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Probing (Hyper)Nuclei Wave Functions and Production Mechanisms in $\sqrt{s_{\rm{NN}}}=200$ GeV Isobar Collisions at RHIC
Isobar collision yields of ³_ΛH and light nuclei favor coalescence with non-Gaussian hypertriton wave functions that carry enhanced short-distance d–Λ probability, inconsistent with a Gaussian ansatz tied to the measu...
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The impact of hyperons on neutron star mergers: gravitational waves, mass ejection and black hole formation
Hyperonic equations of state raise the dominant postmerger gravitational-wave frequency by a few percent and reduce the prompt black hole formation threshold by about 0.05 solar masses.
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In-medium $\Lambda N$ interactions with leading order covariant chiral hyperon/nucleon-nucleon forces
A relativistic Brueckner-Hartree-Fock calculation with leading-order covariant chiral hyperon-nucleon and nucleon-nucleon forces reproduces the empirical Lambda single-particle potential in nuclear matter.
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Neutron Star Properties and Femtoscopic Constraints
Hyperon interactions tuned to femtoscopic data still yield neutron star maximum masses of only 1.3-1.4 solar masses, leaving the hyperon puzzle unresolved.
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$\Lambda$ and $\Sigma$ potentials in neutron stars, hypernuclei, and heavy-ion collisions
Certain three-baryon force parameters that make Lambda hyperons repulsive at high density also reproduce the empirical Sigma potential and existing hypernuclear and heavy-ion data.
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Toward a Unified Understanding of the Dense Matter Equation of State
A review of three Bayesian/computational frameworks for combining heavy-ion and astrophysical constraints on the dense-matter equation of state, plus a proposed unified integration workflow.
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