Huan Dong, T. T. S. Kuo, Hyun Kyu Lee, R. Machleidt, Mannque Rho
The half-skyrmions that appear in dense baryonic matter when skyrmions are put on crystals modify drastically hadron properties in dense medium and affect strongly the nuclear tensor forces, thereby influencing the equation of state (EoS) of dense nuclear and asymmetric nuclear matter. The matter comprised of half skyrmions has vanishing quark condensate but non-vanishing pion decay constant and could be interpreted as a hadronic dual of strong-coupled quark matter. We infer from this observation a set of new scaling laws -- called "new-BR" -- for the parameters in nuclear effective field theory controlled by renormalization-group flow. They are subjected to the EoS of symmetric and asymmetric nuclear matter, and are then applied to nuclear symmetry energies and properties of compact stars. The changeover from the skyrmion matter to a half-skyrmion matter that takes place after the cross-over density $n_{1/2}$ makes the EoS stiffer and leads to a compact star as massive as $\sim 2.4M_\odot$. Cross-over density in the range $ 1.5n_0 \lsim n_{1/2} \lsim 2.0 n_0$ has been employed, and the differences between the EoSs before and after this density and the dependence of our results on $n_{1/2}$ are discussed. The novel structure of the EoS obtained with the new-BR scaling is relevant for neutron-rich nuclei and compact star matter and could be studied in RIB (rare isotope beam) machines.
View original:
http://arxiv.org/abs/1207.0429
No comments:
Post a Comment