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arXiv · 1712.03110

Meson effect in the proto neutron star PSR J0348+0432

Xian-Feng Zhao
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Abstract

The effect of mesons $f_{0}(975)$ (named as $f$), $ϕ(1020)$ (named as $ϕ$) and $δ$ on the moment of inertia of the PNS PSR J0348+0432 is examined in the framework of the relativistic mean field theory considering the baryon octet. It is found that the energy density $\varepsilon$ and pressure $p$ will increase considering the mesons $δ$ whereas will decrease as the mesons $f$ and $ϕ$ being considered. When the mesons $f, ϕ$ and $δ$ are considered, the energy density and pressure will all decrease. It is also found that the contribution of mesons $f$, $ϕ$ and $δ$ to the central energy density is only the central energy density's 0.06$\sim$0.6\% whereas the contribution of mesons $f$, $ϕ$ and $δ$ to the central pressure is the central pressure's 4$\sim$7\%. For the radius, it will decrease when the contributions of mesons $f$, $ϕ$ and $δ$ are considered. The moment of inertia $I$ will increase considering the mesons $δ$ whereas will decrease as the mesons $f$ and $ϕ$ being considered. When the mesons $f$, $ϕ$ and $δ$ are all considered, the moment of inertia will decrease. It is found that the contribution of mesons $f$ and $ϕ$ to moment of inertia is 4$\sim$9 times larger than that of mesons $δ$. Our results show that the mesons $f$, $ ϕ$ and $δ$ contribute to the moment of inertia's 2$\sim$5\%.

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Xian-Feng Zhao. 2017-12-08. Meson effect in the proto neutron star PSR J0348+0432. https://doi.org/10.1007/s10773-017-3470-z

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