A Lee-Yang--inspired functional with a density--dependent neutron-neutron scattering length
| Autor: | Grasso, M., Lacroix, D., Yang, C. J. |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Phys. Rev. C 95, 054327 (2017) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevC.95.054327 |
| Popis: | Inspired by the low--density Lee-Yang expansion for the energy of a dilute Fermi gas of density $\rho$ and momentum $k_F$, we introduce here a Skyrme--type functional that contains only $s$-wave terms and provides, at the mean--field level, (i) a satisfactory equation of state for neutron matter from extremely low densities up to densities close to the equilibrium point, and (ii) a good--quality equation of state for symmetric matter at density scales around the saturation point. This is achieved by using a density--dependent neutron-neutron scattering length $a(\rho$) which satisfies the low--density limit (for Fermi momenta going to zero) and has a density dependence tuned in such a way that the low--density constraint $|a(\rho) k_F| \le 1$ is satisfied at all density scales. Comment: 5 figures |
| Databáze: | arXiv |
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