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Title: Hyperon Puzzle: Hints from Quantum Monte Carlo Calculations

Abstract

The onset of hyperons in the core of neutron stars and the consequent softening of the equation of state have been questioned for a long time. Controversial theoretical predictions and recent astrophysical observations of neutron stars are the grounds for the so-called hyperon puzzle. We calculate the equation of state and the neutron star mass-radius relation of an infinite systems of neutrons and. particles by using the auxiliary field diffusion Monte Carlo algorithm. We find that the three-body hyperon-nucleon interaction plays a fundamental role in the softening of the equation of state and for the consequent reduction of the predicted maximum mass. We have considered two different models of three-body force that successfully describe the binding energy of medium mass hypernuclei. Our results indicate that they give dramatically different results on the maximum mass of neutron stars, not necessarily incompatible with the recent observation of very massive neutron stars. We conclude that stronger constraints on the hyperon-neutron force are necessary in order to properly assess the role of hyperons in neutron stars.

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Nuclear Physics; USDOE Office of Science - National Energy Research Scientific Computing Center (NERSC)
OSTI Identifier:
1396283
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 114; Journal Issue: 9; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

Lonardoni, Diego, Lovato, Alessandro, Gandolfi, Stefano, and Pederiva, Francesco. Hyperon Puzzle: Hints from Quantum Monte Carlo Calculations. United States: N. p., 2015. Web. doi:10.1103/PhysRevLett.114.092301.
Lonardoni, Diego, Lovato, Alessandro, Gandolfi, Stefano, & Pederiva, Francesco. Hyperon Puzzle: Hints from Quantum Monte Carlo Calculations. United States. doi:10.1103/PhysRevLett.114.092301.
Lonardoni, Diego, Lovato, Alessandro, Gandolfi, Stefano, and Pederiva, Francesco. Sun . "Hyperon Puzzle: Hints from Quantum Monte Carlo Calculations". United States. doi:10.1103/PhysRevLett.114.092301.
@article{osti_1396283,
title = {Hyperon Puzzle: Hints from Quantum Monte Carlo Calculations},
author = {Lonardoni, Diego and Lovato, Alessandro and Gandolfi, Stefano and Pederiva, Francesco},
abstractNote = {The onset of hyperons in the core of neutron stars and the consequent softening of the equation of state have been questioned for a long time. Controversial theoretical predictions and recent astrophysical observations of neutron stars are the grounds for the so-called hyperon puzzle. We calculate the equation of state and the neutron star mass-radius relation of an infinite systems of neutrons and. particles by using the auxiliary field diffusion Monte Carlo algorithm. We find that the three-body hyperon-nucleon interaction plays a fundamental role in the softening of the equation of state and for the consequent reduction of the predicted maximum mass. We have considered two different models of three-body force that successfully describe the binding energy of medium mass hypernuclei. Our results indicate that they give dramatically different results on the maximum mass of neutron stars, not necessarily incompatible with the recent observation of very massive neutron stars. We conclude that stronger constraints on the hyperon-neutron force are necessary in order to properly assess the role of hyperons in neutron stars.},
doi = {10.1103/PhysRevLett.114.092301},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 9,
volume = 114,
place = {United States},
year = {2015},
month = {3}
}

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