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

2021 ◽  
Vol 104 (3) ◽  
Author(s):  
Francesca Sammarruca ◽  
Randy Millerson
Keyword(s):  
Field Theory ◽  
Equation Of State ◽  
Fourth Order ◽  
Effective Field Theory ◽  
Symmetry Energy ◽  
Effective Field ◽  
Neutron Matter ◽  
Chiral Effective Field Theory

scholarly journals Temperature effects on the neutron matter equation of state obtained from chiral effective field theory

2020 ◽  
Vol 35 (19) ◽  
pp. 2050156
Author(s):  
Francesca Sammarruca ◽  
R. Machleidt ◽  
R. Millerson
Keyword(s):  
Field Theory ◽  
Equation Of State ◽  
Effective Field Theory ◽  
Temperature Effects ◽  
Chemical Potential ◽  
Effective Field ◽  
Neutron Matter ◽  
Thermodynamic Quantities ◽  
Chiral Effective Field Theory ◽  
Nucleon Force

Temperature effects on the neutron matter equation of state (EoS) are investigated in the framework of chiral effective field theory. Recently, state-of-the-art chiral two-nucleon forces are applied from third to fifth order in the chiral expansion together with chiral three-nucleon forces, allowing for a determination of the truncation error of the theoretical predictions. The thermodynamic quantities considered include the chemical potential, the internal energy, the entropy, and the free energy. In general, good order-by-order convergence of all predictions is observed. As to be expected, temperature effects are largest at low density. The temperature dependence of the chiral three-nucleon force turns out to be weak.

Recent Results from Nuclear Lattice Simulations

2007 ◽  
Vol 22 (07n10) ◽  
pp. 555-564
Author(s):  
DEAN LEE
Keyword(s):  
Field Theory ◽  
Nuclear Matter ◽  
Effective Field Theory ◽  
Recent Progress ◽  
Effective Field ◽  
Matter Density ◽  
Neutron Matter ◽  
Chiral Effective Field Theory ◽  
Nuclear Matter Density ◽  
Work Done

We discuss recent progress in the study of nuclear and neutron matter by combining chiral effective field theory with non-perturbative lattice methods. We present results for hot neutron matter at temperatures 20 to 40 MeV and densities below twice nuclear matter density. This proceedings article is a summary of results from work done in collaboration with Bugra Borasoy and Thomas Schaefer1.

scholarly journals Chiral Effective Field Theory and the High-Density Nuclear Equation of State

2021 ◽  
Vol 71 (1) ◽  
Author(s):  
C. Drischler ◽  
J.W. Holt ◽  
C. Wellenhofer
Keyword(s):  
Field Theory ◽  
Equation Of State ◽  
Neutron Stars ◽  
Nuclear Matter ◽  
Effective Field Theory ◽  
Effective Field ◽  
High Density ◽  
Chiral Effective Field Theory ◽  
Nuclear Equation Of State ◽  
Density Regime

Born in the aftermath of core-collapse supernovae, neutron stars contain matter under extraordinary conditions of density and temperature that are difficult to reproduce in the laboratory. In recent years, neutron star observations have begun to yield novel insights into the nature of strongly interacting matter in the high-density regime where current theoretical models are challenged. At the same time, chiral effective field theory has developed into a powerful framework to study nuclear matter properties with quantified uncertainties in the moderate-density regime for modeling neutron stars. In this article, we review recent developments in chiral effective field theory and focus on many-body perturbation theory as a computationally efficient tool for calculating the properties of hot and dense nuclear matter. We also demonstrate how effective field theory enables statistically meaningful comparisons among nuclear theory predictions, nuclear experiments, and observational constraints on the nuclear equation of state. Expected final online publication date for the Annual Review of Nuclear and Particle Science, Volume 71 is September 2021. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

scholarly journals Dilute neutron matter on the lattice at next-to-leading order in chiral effective field theory

2008 ◽  
Vol 35 (3) ◽  
pp. 357-367 ◽  
Author(s):  
B. Borasoy ◽  
E. Epelbaum ◽  
H. Krebs ◽  
D. Lee ◽  
U. -G. Meißner
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Effective Field ◽  
Neutron Matter ◽  
Leading Order ◽  
Chiral Effective Field Theory
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