Abstract
The recently discovery of a massive neutron star (PSR J1614-2230 of 1.97 ± 0.04 M⊙) rules out the soft equation-of-states (EOSs) such as those included hyperons or kaon condensates at high densities, while the nuclear theory or the terrestrial laboratory data prefer a soft EOS. Here we propose one possible mechanism to allow that the observed massive neutron star can be supported by a soft EOS, that is, if the gravitational constant G varies at super strong field, a soft EOS can support the massive neutron stars.
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