科研之友
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摘要
We investigate the role of higher order couplings, along with the condensation of antikaons (K- and (K) over bar (0)), on the properties of neutron stars (NS). We employ extended versions of the relativistic mean-field model, in which kaon-nucleon and nucleon-nucleon interactions are taken on the same footing. We find that the onset of condensation of K- and (K) over bar (0) highly depends not only on the strength of optical potential but also on the new couplings. The presence of antikaons leads to a softer equation of state and makes the neutron star core symmetric and lepton-deficient. We show that these effects strongly influence the mass-radius relation as well as the composition of the neutron star. We also show that the recently observed 1.97 +/-.04 solar mass NS can be explained in three ways: (i) a stiffer EoS with both antikaons, (ii) a relatively soft EoS with K- and (iii) a softer EoS without antikaons.
- 出版日期2013-2
