From hypernuclei to the Inner Core of Neutron Stars: A Quantum Monte Carlo Study

17th International Conference on Recent Progress in Many-Body Theories

Lonardoni, D.^1 ; Pederiva, F.^2,3 ; Gandolfi, S.^4

Physics Division, Argonne National Laboratory, Argonne, IL 60439, United States^1

Dipartimento di Fisica, Università di Trento, via Sommarive 14, 1-38123 Trento, Italy^2

I.N.F.N.-T.I.F.P.A, Trento Institute for Fundamental Physics and Applications, 1-38123 Trento, Italy^3

Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States^4

关键词: Auxiliary-fields;    Equation of state;    Hypernuclei;    Neutron matter;    Neutron stars;    Quantum monte carlo studies;    Separation energy;    Symmetry energies;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/529/1/012012/pdf
DOI  :  10.1088/1742-6596/529/1/012012

来源: IOP

【 摘 要 】

Auxiliary Field Diffusion Monte Carlo (AFDMC) calculations have been employed to revise the interaction beween A-hyperons and nucleons in hypernuclei. The scheme used to describe the interaction, inspired by the phenomenological Argonne-Urbana forces, is the ΛN + ΛNN potential firstly introduced by Bodmer, Usmani et al. Within this framework, we performed calculations on light and medium mass hypernuclei in order to assess the extent of the repulsive contribution of the three-body part. By tuning this contribution in order to reproduce the Λ separation energy in5ΛHe and17ΛO, experimental findings are reproduced over a wide range of masses. Calculations have then been extended to Λ-neutron matter in order to derive an analogous of the symmetry energy to be used in determining the equation of state of matter in the typical conditions found in the inner core of neutron stars.