[Triumf-seminars] TRIUMF Theory Seminar today at 13:00

[TRIUMF Seminars]

Date/Time: Mon 2012-01-23 at 13:00

Location:  Theory Room         

Speaker:   Huan Dong (Stoney Brook)

Title:     Brown-Rho scaling & Three-body forces in nuclear matter and neutron stars

Abstract: We have studied the effects of the Brown-Rho (BR) scalings and three-nucleon
forces in nuclear matter, especially about its saturation properties, 
and neutron stars. The use of the two-nucleon interactions alone is unable 
to reproduce the empirical nuclear matter properties. The inclusion of the 
linear BR scaling, where the mesons constituting the NN potential are scaled 
with the nuclear medium density, can restore the nuclear saturation. But the 
resulting equation of state (EOS) is too stiff at high densities. Two 
non-linear BR scalings, one of them proposed by Ericson, have been considered; 
both give EOSs with satisfactory saturation properties and in good agreement 
the empirical constraint of Danilewicz et al. We have also calculated the 
nuclear symmetry energies, and the results with the non-linear scalings are in 
good agreement with the empirical results of Li et al. and Tsang et al. The 
inclusion of such scaling effects is important in making the calculated neutron
star properties in good agreement with the empirical ones; the neutron stars'
maximum mass obtained with (without) such scalings is respectively 1.80(1.24)
mass of the Sun.

We have also calulated the nuclear matter EOS including both two-nucleon 
interaction and a chiral three-body potential. The dependence of the nuclear 
matter EOS on the low-energy constants is discussed. For a certain choice of 
these parameters, a satisfactory EOS is obtained.



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