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Strangeness in Nuclei and Neutron Stars
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abstract
We review the present status of the experimental and theoretical developments in the field of strangeness in nuclei and neutron stars. We start by discussing the $\bar K N$ interaction, that is governed by the presence of the $\Lambda(1405)$. We continue by showing the two-pole nature of the $\Lambda(1405)$, and the production mechanisms in photon-, pion-, kaon-induced reactions as well as proton-proton collisions, while discussing the formation of $\bar K NN$ bound states. We then move to the theoretical and experimental analysis of the properties of kaons and antikaons in dense nuclear matter, paying a special attention to kaonic atoms and the analysis of strangeness creation and propagation in nuclear collisions. Next, we examine the $\phi$ meson and the advances in photoproduction, proton-induced and pion-induced reactions, so as to understand its properties in dense matter. Finally, we address the dynamics of hyperons with nucleons and nuclear matter, and the connection to the phases of dense matter with strangeness in the interior of neutron stars.
Forward citations
Cited by 10 Pith papers
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Neutrino-induced hyperon final-state interactions as constraints on the in-medium hyperon potential
Neutrino hyperon final-state interactions at SBND/DUNE constrain the sub-saturation U_Λ and U_Σ potentials, mapping them through a GM1 EOS to a neutron-star maximum-mass posterior set mainly by external priors.
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Cooling of Hybrid Stars with a 2SC+$<dd>$ Phase
Hybrid stars with a 2SC+⟨dd⟩ quark core cool hotter than with 2SC and near CFL; with a 3P2 gap near 5×10^8 K their cooling curves pass through the observed temperatures of 3C58, Vela Jr., and Vela-like pulsars.
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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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Accelerator neutrinos as a probe of in-medium hyperon potentials
StrangeMC forecasts that SBND/DUNE hyperon FSI observables constrain U_Λ(ρ0) to ~6 MeV after slope marginalization, with systematics distinct from hypernuclear data.
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Quarkyonic Stars with Strangeness
A three-flavor quarkyonic model with octet baryons yields stiffer neutron-star EOS and raises maximum masses, potentially resolving the hyperon puzzle.
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Polarization-dependent mass modifications of $\phi$ meson with finite momentum in nuclear matter
In nuclear matter, the phi meson's longitudinal polarization mass decreases quadratically with momentum; the transverse polarization mass stays constant.
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Lattice QCD Study of Positive Parity Dibaryons with Maximal Charm and Strangeness
Lattice QCD finds the Omega_ccc-Omega_ccc dibaryon likely bound by about 45 MeV in the spin-0 channel, Omega-Omega near threshold, and both spin-2 systems unbound.
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Rapidly Spinning Massive Pulsars as an Indicator of Quark Deconfinement
Within a tuned hybrid equation of state, a color-superconducting quark core—absent from the hyperonic hadronic model—is needed to reach the mass and spin of PSR J0952–0607.
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Perspectives for hyperon and hypernuclei physics
Hypernuclei are reviewed as key probes of the strong interaction, with upcoming experiments and higher-order theory expected to resolve the hypertriton binding energy and charge symmetry puzzles.
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Hyperonic degrees of freedom in binary neutron star mergers
A review of neutron star merger simulations showing that hyperonic equations of state yield distinctive gravitational wave, temperature, ejecta, and collapse-threshold signatures.
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