scholarly journals Effects of chiral effective field theory equation of state on binary neutron star mergers

2018 ◽  
Vol 98 (4) ◽  
Author(s):  
Andrea Endrizzi ◽  
Domenico Logoteta ◽  
Bruno Giacomazzo ◽  
Ignazio Bombaci ◽  
Wolfgang Kastaun ◽  
...  
Keyword(s):  
Field Theory ◽  
Neutron Star ◽  
Equation Of State ◽  
Effective Field Theory ◽  
Effective Field ◽  
Chiral Effective Field Theory ◽  
Binary Neutron Star ◽  
Theory Equation

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 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.

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