Effect of symmetry energy slope parameter on nuclear matter and neutron star properties

The physics of neutron stars (NSs) have acquired huge attention over the years after the detection of gravitational waves from binary merger GW170817. In this work we study how L_sym affects the E_sym as well as the NS properties. For the purpose we consider the matter to be hadronic and the model is based on the framework of relativistic mean field theory (RMF). The main feature of this work is that we consider density dependent RMF parameterization (DDMEX) to model the NS matter (NSM). We applied RMF model with DDMEX parameterizations to describe nuclear matter as well as NS properties. We have investigated the effect of L_sym on E_sym and mass-radius of NSs by varying the value of L_sym consistent with the PREX-2 data via the parameter aρ. We found that below ρ0, the higher the L_sym, lower the E_sym; while the opposite trend is noticed above ρ₀. This effect is reflected correspondingly in the mass-radius variation of β stable NSM as the radius of intermediate mass NSs, specially R1.4 is well affected by the value of L_sym. Lower values of L_sym lowers the value of R1.4, thereby satisfying the GW170817 data better without much effect on the maximum mass of the NS