Interplay of antikaons with hyperons in nuclei and in neutron stars
1 Physics Division, Education Center, Chiba Institute of Technology, 2-1-1 Shibazono, Narashino, Chiba 275-0023, Japan
2 Advanced Science Research Center, Japan Atomic Energy Agency, Ibaraki 319-1195, Japan
3 Department of Physics, Kyoto University, Kyoto 606-8502, Japan
a e-mail: firstname.lastname@example.org
Published online: 9 June 2014
Possible coexistence of antikaons and hyperons in nuclei and in neutron stars is investigated based on the same interaction model within the relativistic mean-field theory. It is shown that the ground state of multi-strangeness nuclei is given by multi-hypernuclei without bound K− mesons. In neutron stars, on the other hand, kaon condensation appears in hyperon-mixed matter for a moderate K− potential depth, but it leads to significant softening of the equation of state. Some repulsive effect at high density should be taken into account so as to be consistent with recent observations of massive neutron stars.
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