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Area of Science:

  • Nuclear Physics
  • Astrophysics
  • Quantum Chromodynamics

Background:

  • The presence of hyperons in neutron star cores affects their equation of state.
  • Astrophysical observations and theoretical models present a 'hyperon puzzle' regarding neutron star properties.

Purpose of the Study:

  • To investigate the role of hyperon-nucleon interactions in neutron star matter.
  • To calculate the equation of state and mass-radius relation for neutron-Lambda systems.

Main Methods:

  • Auxiliary field diffusion Monte Carlo algorithm applied to neutron and Lambda particle systems.
  • Utilized two models for three-body hyperon-nucleon forces, validated by hypernuclear binding energies.

Main Results:

  • Three-body interactions are crucial for softening the equation of state and reducing predicted maximum neutron star mass.
  • Different three-body force models yield significantly varied maximum mass predictions.
  • Results suggest compatibility with recent observations of massive neutron stars.

Conclusions:

  • Three-body hyperon-nucleon interactions are fundamental to understanding neutron star interiors.
  • Further constraints on hyperon-neutron forces are required to resolve the hyperon puzzle.
  • Accurate modeling of hyperon interactions is essential for predicting neutron star properties.