The influence of the in-medium mesons on the effective nucleon mass and inturn on the equation of state of hot/dense nuclear matter is discussed in theWalecka model. Due to the self-consistent treatment of couplings betweennucleons and $\sigma $ and $\omega$ mesons, the temperature and densitydependence of the effective hadron masses approaches more towards the Brown-Rhoscaling law, and the compression modulus $K$ is reduced from $550 MeV$ in meanfield theory to an accepted value $318.2 MeV$.
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