Abstract
Radii and masses of neutron stars are calculated for various EoSs using a perturbative approach. Also increased masses are calculated due to magnetic fields. Moreover, the radius of a neutron star is calculated as a function of its increased total mass by rotation. As for the EoSs, we adopt 5 hadronic EoSs in relativistic mean field (RMF) theory to calculate the mass-radius relations (MR relations). It is found that the total masses are over twice the solar mass for all 5 hadronic EoSs in the presence of magnetic fields together with rotation. Three obtained EoSs (GM1, TM2-ωρ-a and TM2-ωρ-b) are found to be in the range of the observation. Hybrid stars are calculated to have masses more than twice the solar mass in a rapid rotation for 5 EoSs.
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