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Constraining Gauss — Bonnet Parameter and Radii of Compact Stars in the Mass-gap Using Realistic Equation of States in 4D-EGB Gravity / Priyobarta N., Newton Singh K., Maurya S., Mishra B. - Текст на англ. языке // Физические интерпретации теории относительности, Международная научная конференция 24-я, Москва, 7 - 10 июля 2025 г. = Physical Interpretations of Relativity Theory (PIRT–2025) : сборник тезисов / МГТУ им. Н. Э. Баумана. - М., 2025. -
In this paper, we have investigated the effects of Gauss-Bonnet (GB) extension on Einstein's gravity in 4-dimensions. Four different EoS such as SLy4, APR4, FPS and Togashi are considered. These EoS are used to model the massive neutron stars like PSR J2215+5135, PSR J1959+2048, PSR J1810+1744, PSR J0740+6620 and GW190814, which are in the neutron star-black hole (NS-BH) mass gap. We have calculated the mass and radius through the MR curves for different values of the GB-coupling parameter for four different EoSs to examine the upper limit of masses that fall within the mass-gap. Our result shows that the positive branch of is suitable for explaining the existence of massive neutron stars in the mass-gap. Bondi's and static stability criteria have confirmed the stability of these massive neutron stars. In fact, an increase in GB-coupling strength improves the stability of these massive neutron stars. Furthermore, the surface redshift of these massive neutron stars is below the maximum limit, i. e. Zs < 2. Finally, we have used the MR curves with the observed masses to predict the radii of PSR J2215 + 5135, PSR J1959 + 2048, PSR J1810 + 1754, PSR J0740 + 6620 and GW190814 in GR and 4D-EGB gravity. The predicted radii are in agreement with the constraints from the GW170817 event. Lastly, the maximum observed NS mass is fitted in the MR curves implying that the range of should be somewhere around 0 to 5 [km2].
