Including the delta meson in relativistic mean-field models widens the allowed symmetry energy slope and curvature, changing low-mass neutron star radii while leaving maximum mass nearly fixed.
Correlation between the symmetry energy slope and the deconfinement phase transition
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abstract
We study how the nuclear symmetry energy slope ($L$) can affect the hadron-quark phase transition and neutron star properties. We show that the main physical quantities as the critical chemical potential and pressure are strongly influenced by the symmetry energy slope. In extreme cases, the total amount of deconfined quarks can reach up to 99$\%$ of the hybrid star mass.
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Impact of the Scalar Isovector $\delta$-meson on the description of nuclear matter and neutron star properties
Including the delta meson in relativistic mean-field models widens the allowed symmetry energy slope and curvature, changing low-mass neutron star radii while leaving maximum mass nearly fixed.