Dark particle mass effects on neutron star properties from a short-range correlated hadronic model

Abstract

In this work we study a relativistic mean-field (RMF) hadronic model, with nucleonic short-range correlations (SRC) included, coupled to dark matter (DM) through the Higgs boson. We study different parametrizations of this model by running the dark particle Fermi momentum, and its mass in the range of $50$ GeV $⩽M_{\chi }⩽500$ GeV, compatible with experimental spin-independent scattering cross-sections. By using this RMF-SRC-DM model, we calculate some neutron star quantities, namely, mass-radius profiles, dimensionless tidal deformabilities, and crustal properties. Our findings show that is possible to construct RMF-SRC-DM parametrizations in agreement with constraints provided by LIGO and Virgo collaboration (LVC) on the GW170817 event, and recent observational data from the NICER mission. Furthermore, we show that the increase of $M_{\chi }$ favors the model to attain data from LVC regarding the tidal deformabilities. Higher values of $M_{\chi }$ also induce a reduction of the neutron star crust (mass and thickness), and cause a decrease of the crustal fraction of the moment of inertia ($I_{\mathrm{crust}}/I$). Nevertheless, we show that some RMF-SRC-DM parametrizations still exhibit $I_{\mathrm{crust}}/I>7\%$, a condition that explains the glitch activity in rotation-powered pulsars such as the Vela one. Therefore, dark matter content can also be used for describing such a phenomenon.

arXiv comment10 pages, 8 figures. Published in Monthly Notices of the Royal Astronomical Society

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