Nuclear Matter in Relativistic Mean Field Theory with Isovector Scalar Meson

Details Nuclear Matter in Relativistic Mean Field Theory with Isovector Scalar Meson Nuclear Matter in Relativistic Mean Field Theory with Isovector Scalar Meson

1997-03-08

arxiv.org/abs/astro-ph/9703049v1

Phys.Lett. B399 (1997) 191-195

Astronomy and Astrophysics

Astrophysics

13 pages, plain TeX, 6 figures, Physics Letters B in press

Scientific paper

10.1016/S0370-2693(97)00306-7

Relativistic mean field (RMF) theory of nuclear matter with the isovector scalar mean field corresponding to the delta-meson [a_0(980)] is studied. While the delta-meson mean field vanishes in symmetric nuclear matter, it can influence properties of asymmetric nuclear matter in neutron stars. The RMF contribution due to delta-field to the nuclear symmetry energy is negative. To fit the empirical value, E_s=30 MeV, a stronger rho-meson coupling is required than in the absence of the delta-field. The energy per particle of neutron matter is then larger at high densities than the one with no delta-field included. Also, the proton fraction of beta-stable matter increases. Splitting of proton and neutron effective masses due to the delta-field can affect transport properties of neutron star matter.

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