Crust-core transition of a neutron star: effect of the temperature under strong magnetic fields

Abstract

The effect of temperature on the crust-core transition of a magnetar is studied. The thermodynamical spinodals are used to calculate the transition region within a relativistic mean-field approach for the equation of state. Magnetic fields with intensities $5\times 10^{16}$ G and $5\times 10^{17}$ G are considered. It is shown that the effect on the extension of the crust-core transition is washed away for temperatures above $10^9$ K for magnetic field intensities $\lesssim 5\times 10^{16}$ G but may still persist if a magnetic field as high as $5\times 10^{17}$G is considered. For temperatures below that value, the effect of the magnetic field on crust-core transition is noticeable and grows as the temperature decreases and, in particular, it is interesting to identify the existence of disconnected non-homogeneous matter above the $B=0$ crust core transition density. Models with different symmetry energy slopes at saturation show quite different behaviors. In particular, a model with a large slope, as suggested by the recent results of PREX-2, predicts the existence of up to four disconnected regions of non-homogeneous matter above the zero magnetic field crust-core transition density.

arXiv comment9 pages, 5 figures, published version; Topical Issue "The QCD Phase Diagram in Strong Magnetic Fields"

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