Neutron Stars in f(R)-Gravity and Its Extension with a Scalar Axion Field
Abstract
:1. Introduction
2. Basic Equations for Non-Rotating Stars in Isotropic Coordinates
3. R-Square Gravity with a Scalar Axion Field
4. Discussion of Results
Author Contributions
Funding
Conflicts of Interest
References
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, MeV/fm | , | , | , km | , | |
---|---|---|---|---|---|
GM1 EoS | |||||
0 | 0 | 0.70 | 13.42 | 0.048 | |
0.25 | 0 | 0.63 | 12.95 | 0.034 | |
200 | 2.5 | 0 | 0.56 | 12.52 | 0.0092 |
0.25 | 250 | 0.58 | 12.61 | 0.014 | |
0.25 | 1000 | 0.55 | 12.46 | 0.0059 | |
0 | 0 | 2.07 | 13.55 | 0.049 | |
0.25 | 0 | 2.07 | 13.58 | 0.050 | |
500 | 2.5 | 0 | 2.11 | 13.79 | 0.019 |
0.25 | 250 | 2.08 | 13.73 | 0.016 | |
0.25 | 1000 | 2.12 | 13.85 | 0.0068 | |
0 | 0 | 2.37 | 12.76 | −0.012 | |
0.25 | 0 | 2.39 | 12.84 | 0.026 | |
800 | 2.5 | 0 | 2.48 | 13.11 | 0.015 |
0.25 | 250 | 2.48 | 13.07 | 0.0092 | |
0.25 | 1000 | 2.52 | 13.22 | 0.0057 | |
APR EoS | |||||
0 | 0 | 0.83 | 11.47 | 0.087 | |
0.25 | 0 | 0.76 | 11.17 | 0.058 | |
400 | 2.5 | 0 | 0.72 | 10.95 | 0.014 |
0.25 | 250 | 0.71 | 10.95 | 0.018 | |
0.25 | 1000 | 0.71 | 10.90 | 0.0073 | |
0 | 0 | 1.63 | 11.30 | 0.067 | |
0.25 | 0 | 1.63 | 11.33 | 0.066 | |
650 | 2.5 | 0 | 1.63 | 11.50 | 0.021 |
0.25 | 250 | 1.64 | 11.45 | 0.018 | |
0.25 | 1000 | 1.65 | 11.53 | 0.0076 | |
0 | 0 | 2.07 | 10.93 | −0.031 | |
0.25 | 0 | 2.08 | 10.94 | 0.031 | |
900 | 2.5 | 0 | 2.17 | 11.23 | 0.016 |
0.25 | 250 | 2.16 | 11.18 | 0.014 | |
0.25 | 1000 | 2.20 | 11.32 | 0.0062 |
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Astashenok, A.; Odintsov, S. Neutron Stars in f(R)-Gravity and Its Extension with a Scalar Axion Field. Particles 2020, 3, 532-542. https://doi.org/10.3390/particles3030036
Astashenok A, Odintsov S. Neutron Stars in f(R)-Gravity and Its Extension with a Scalar Axion Field. Particles. 2020; 3(3):532-542. https://doi.org/10.3390/particles3030036
Chicago/Turabian StyleAstashenok, Artyom, and Sergey Odintsov. 2020. "Neutron Stars in f(R)-Gravity and Its Extension with a Scalar Axion Field" Particles 3, no. 3: 532-542. https://doi.org/10.3390/particles3030036