Relativistic Mean-Field Models with Effective Hadron Masses and Coupling Constants, and rho^- Condensation

Details Relativistic Mean-Field Models with Effective Hadron Masses and Coupling Constants, and rho^- Condensation Relativistic Mean-Field Models with Effective Hadron Masses and Coupling Constants, and rho^- Condensation

2004-10-14

arxiv.org/abs/nucl-th/0410063v1

Nucl.Phys. A759 (2005) 373-413

Physics

Nuclear Physics

Nuclear Theory

43p, 20figs

Scientific paper

10.1016/j.nuclphysa.2005.05.154

We study relativistic mean-field models with hadron masses and coupling constants depending self-consistently on a scalar meson field. We demonstrate that by the field redefinition some models can be equivalently transformed into each other. Thereby the large variety of scaling functions for masses and couplings can be reduced to a restricted set of functions with a constrained dependence on a scalar field. We show how by choosing properly the latter scaling functions one may stiffen or soften the equation of state at high densities and simultaneously increase the threshold density for the direct Urca process without any change of the description of nuclear matter close to the saturation density. The stiffening of the equation of state might be motivated by recent neutron star mass measurements, whereas the increase of the threshold density for the direct Urca process is required by the analysis of neutron star cooling data. We demonstrate that if a rho meson is included in a mean-field model as a non-Abelian gauge boson, then there is a possibility for a charged rho-meson condensation in dense nuclear matter. We show that such a novel phase can be realized in neutron star interiors already for sufficiently low densities, typically $\sim 3\div 4 n_0$, where $n_0$ is the nuclear saturation density. In the framework of the relativistic mean field model the new phase arises in a second-order phase transition. The appearance of a $\rho^-$ condensate significantly alters the proton fraction in a neutron star but changes moderately the equation of state. The neutrino emissivity of the processes involving a $\rho^-$ meson condensate is estimated.

Affiliated with

Also associated with

No associations

Rating

Relativistic Mean-Field Models with Effective Hadron Masses and Coupling Constants, and rho^- Condensation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Relativistic Mean-Field Models with Effective Hadron Masses and Coupling Constants, and rho^- Condensation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Relativistic Mean-Field Models with Effective Hadron Masses and Coupling Constants, and rho^- Condensation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-664712