Analysis of the neutron matter equation of state and the symmetry energy up to fourth order of chiral effective field theory

Sammarruca, Francesca; Millerson, Randy

doi:10.1103/physrevc.104.034308

Title: Analysis of the neutron matter equation of state and the symmetry energy up to fourth order of chiral effective field theory

Journal Article · 10 September 2021 · Physical Review C

DOI: https://doi.org/10.1103/physrevc.104.034308 · OSTI ID:1820909

^[1]; Millerson, Randy ^[2]

Univ. of Idaho, Moscow, ID (United States); University of Idaho
Univ. of Idaho, Moscow, ID (United States)

We present predictions for the neutron matter equation of state, from leading to fourth order of chiral effective field theory, using recently developed, accurate chiral nucleon-nucleon potentials. For the many-body method, we employ the nonperturbative particle-particle ladder approximation, that is, we solve the G-matrix equation. Furthermore, we find the impact of subleading three-neutron forces to be mild and attractive. We also show order-by-order predictions for the symmetry energy, and discuss its density dependence in relation to empirical constraints. For the nuclear matter equation of state, in this work we adopt an empirical parametrization with good saturation properties. This is to highlight, specifically, the energy and pressure in neutron matter, particularly when comparing with empirical constraints.

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Research Organization:: Univ. of Idaho, Moscow, ID (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-03ER41270

OSTI ID:: 1820909

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 3 Vol. 104; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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