scholarly journals Isospin Symmetry Breaking Effects on the Mass-Radius Relation of a Neutron Star

Symmetry ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 144
Author(s):  
Giovanni Selva ◽  
Xavier Roca-Maza ◽  
Gianluca Colò
Keyword(s):  
Neutron Star ◽  
Energy Density ◽  
Symmetry Breaking ◽  
Neutron Stars ◽  
Standard Form ◽  
Negligible Effect ◽  
Isospin Symmetry ◽  
Density Functionals ◽  
Isospin Symmetry Breaking

Isospin symmetry breaking effects on the mass-radius relation of a cold, non-accreting neutron star are studied on the basis of two Skyrme Energy Density Functionals (EDFs). One functional contains isospin symmetry breaking terms other than those typically included in Skyrme EDFs while its counterpart is of standard form. Both functionals are based on the same fitting protocol except for the observables and pseudo-observables sensitive to the isospin symmetry breaking channel. The quality of those functionals is similar in the description of terrestrial observables but choosing either of them has a non-negligible effect on the mass-radius relation and tidal deformability of a neutron star. Further investigations are needed to clarify the effects of isospin symmetry breaking on these and other observables of neutron stars that are, and will become, available.

scholarly journals Constraints on the inner edge of neutron star crusts from relativistic nuclear energy density functionals

2019 ◽  
Vol 18 ◽  
pp. 107
Author(s):  
Ch. C. Moustakidis ◽  
T. Niksic ◽  
G. A. Lalazissis ◽  
D. Vretenar ◽  
P. Ring
Keyword(s):  
Neutron Star ◽  
Energy Density ◽  
Neutron Stars ◽  
Nuclear Energy ◽  
Liquid Core ◽  
Transition Density ◽  
Binding Energies ◽  
Density Functionals ◽  
The Core ◽  
Finite Nuclei

The transition density nt and pressure Pt at the inner edge between the liquid core and the solid crust of a neutron star are analyzed using the thermodynami- cal method and the framework of relativistic nuclear energy density functionals. Starting from a functional that has been carefully adjusted to experimental binding energies of finite nuclei, and varying the density dependence of the cor- responding symmetry energy within the limits determined by isovector prop- erties of finite nuclei, we estimate the constraints on the core-crust transition density and pressure of neutron stars: 0.086 fm−3 ≤ nt < 0.090 fm−3 and 0.3 MeV fm−3 < Pt ≤ 0.76 MeV fm−3 [1].

ftvalue of the0+→0+β+decay ofAr32: A measurement of isospin symmetry breaking in a superallowed decay

2008 ◽  
Vol 77 (6) ◽  
Author(s):  
M. Bhattacharya ◽  
D. Melconian ◽  
A. Komives ◽  
S. Triambak ◽  
A. García ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Isospin Symmetry ◽  
Β Decay ◽  
Isospin Symmetry Breaking

scholarly journals Isospin symmetry breaking in 93Tc and statistical properties

2004 ◽  
Vol 598 (1-2) ◽  
pp. 42-46 ◽  
Author(s):  
S. Åberg ◽  
A. Heine ◽  
G.E. Mitchell ◽  
A. Richter
Keyword(s):  
Symmetry Breaking ◽  
Statistical Properties ◽  
Isospin Symmetry ◽  
Isospin Symmetry Breaking

Isospin Symmetry Breaking: Experimental Observation

2003 ◽  
pp. 61-66
Author(s):  
J. Bojowald ◽  
A. Budzanowski ◽  
A. Chatterjee ◽  
J. Ernst ◽  
L. Freindl ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Experimental Observation ◽  
Isospin Symmetry ◽  
Isospin Symmetry Breaking

MASS RELATIONS OF NUCLEONS AND MESONS UNDER SU(2) SYMMETRY BREAKING IN A GAUGED LINEAR SIGMA MODEL

2010 ◽  
Vol 25 (01) ◽  
pp. 25-33 ◽  
Author(s):  
MYUNG-KI CHEOUN ◽  
C. Y. RYU
Keyword(s):  
Symmetry Breaking ◽  
Sigma Model ◽  
Chiral Symmetry Breaking ◽  
Linear Sigma Model ◽  
Neutral Meson ◽  
Isospin Symmetry ◽  
Electromagnetic Interactions ◽  
Charged Meson ◽  
Isospin Symmetry Breaking ◽  
Gauged Linear Sigma Model

We evaluate mass differences between a neutron and a proton, and between a charged and a neutral meson by using a gauged linear sigma model retaining the chiral SU (2) L × SU (2) R × U (1)V symmetry. Masses of nucleons and relevant mesons are generated through the spontaneous and the explicit chiral symmetry breaking. Since our Lagrangian includes explicitly SU(2) isospin symmetry breaking term, it enables us to simultaneously consider the mass differences of a neutron and a proton, and a charged meson and a neutral one. Their reciprocal relations of the mass differences are also derived, where radiative corrections due to electromagnetic interactions are deliberately taken into account to exactly obtain the isospin symmetry breaking effect in the particle mass differences.

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