We study the effect of a quark and nuclear matter mixed phase on the radial oscillation modes of neutron stars. For this study, we have considered recent models from two classes of equations of state, namely, the relativistic mean field theoretical models and models based on realistic nucleon-nucleon interactions incorporating relativistic corrections and three-body nuclear interactions. We find that the effect of mixed phase is to decrease the maximum mass of a stable neutron star and to cause a kink in the radial oscillation frequencies at the onset of the mixed phase.
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