Non-perturbative Extraction of the Effective Mass in Neutron Matter
| Autor: | Buraczynski, Mateusz, Ismail, Nawar, Gezerlis, Alexandros |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 122, 152701 (2019) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.122.152701 |
| Popis: | We carry out non-perturbative calculations of the single-particle excitation spectrum in strongly interacting neutron matter. These are microscopic quantum Monte Carlo computations of many-neutron energies at different densities as well as several distinct excited states. As input, we employ both phenomenological and chiral two- and three-nucleon interactions. We use the single-particle spectrum to extract the effective mass in neutron matter. With a view to systematizing the error involved in this extraction, we carefully assess the impact of finite-size effects on the quasiparticle dispersion relation. We find an effective-mass ratio that drops from 1 as the density is increased. We conclude by connecting our results with the physics of ultracold gases as well as with energy-density functional theories of nuclei and neutron-star matter. Comment: 5+ pages, 3 figures; v2 corresponds to published version |
| Databáze: | arXiv |
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