Adding delta isobars with adjustable meson couplings can shift their appearance density below lambda hyperons and change the predicted radius of a 1.4 solar mass neutron star by up to about 1.7 km.
There are large number of the RMF parameter sets, but it is not possible to study the detail calculation with all the parameter set
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Exploring the impact of $\Delta$-isobars on Neutron Star
Adding delta isobars with adjustable meson couplings can shift their appearance density below lambda hyperons and change the predicted radius of a 1.4 solar mass neutron star by up to about 1.7 km.