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Hyperon-mixed neutron star with universal many-body repulsion

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Abstract.

Neutron stars with large masses \( \sim 2M_{\odot}\) require the hard stiffness of equation of state (EoS) of neutron-star matter. On the other hand, hyperon mixing brings about remarkable softening of EoS. In order to solve this problem, a multi-pomeron exchange potential (MPP) is introduced as a model for the universal many-body repulsion in baryonic systems on the basis of the Extended Soft Core (ESC) baryon-baryon interaction. The strength of MPP is determined by analyzing the nucleus-nucleus scattering with the G -matrix folding model. The interactions in \( \Lambda N\) , \( \Sigma N\) and \( \Xi N\) channels are shown to be consistent with experimental indications. The EoS in neutron-star matter with hyperon mixing is obtained from ESC in addition of MPP, and mass-radius relations of neutron stars are derived. The maximum mass is shown to reach \( 2M_{\odot}\) even in the case of including hyperon mixing on the basis of model-parameters determined by terrestrial experiments.

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Author information

Authors and Affiliations

  1. Nishina Center for Accelerator-Based Science, Institute for Physical and Chemical Research (RIKEN), 351-0198, Wako, Saitama, Japan

    Y. Yamamoto

  2. National Institute of Technology, Ichinoseki College, 021-8511, Ichinoseki, Iwate, Japan

    T. Furumoto

  3. Department of Physics, Chiba Institute of Technology, 2-1-1 Shibazono Narashino, 275-0023, Chiba, Japan

    N. Yasutake

  4. IMAPP, University of Nijmegen, Nijmegen, The Netherlands

    Th. A. Rijken

Authors
  1. Y. Yamamoto
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  2. T. Furumoto
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  3. N. Yasutake
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  4. Th. A. Rijken
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Corresponding author

Correspondence to Y. Yamamoto.

Additional information

Communicated by D. Blaschke

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Yamamoto, Y., Furumoto, T., Yasutake, N. et al. Hyperon-mixed neutron star with universal many-body repulsion. Eur. Phys. J. A 52, 19 (2016). https://doi.org/10.1140/epja/i2016-16019-0

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  • DOI: https://doi.org/10.1140/epja/i2016-16019-0

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