2014/01/31 by Artyom V. Astashenok, Salvatore Capozziello, Salvatore Capozzıello +1 · 1 citation
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics #Cosmology and Gravitation Theories #Equation of state #General relativity #Geophysics and Gravity Measurements #Hadron #Hyperon #Neutron star #Nuclear physics #Physics #Pulsars and Gravitational Waves Research #Quantum mechanics #RADIUS #Theoretical physics #gr-qc #hep-ph
paper · pdf · doi:10.1103/physrevd.89.103509
published as Phys. Rev. D 89, 103509 (2014) · 10 pages, 6 figures, some misprints are fixed
openalex publication_date 2014/05/08 · arxiv created 2014/08/27 · arxiv updated 2015/06/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The so-called ``hyperon puzzle'' in the theory of neutron stars is considered in the framework of modified f(R) gravity. We show that for simple hyperon equations of state, it is possible to obtain the maximal neutron star mass which satisfies the recent observational data for PSR J1614-2230, in higher-derivative models with power-law terms as f(R)=R+\ensuremathγR2+\ensuremathβR3. The soft hyperon equation of state under consideration is usually treated as unrealistic in the standard general relativity. The numerical analysis of the mass-radius relation for massive neutron stars with a hyperon equation of state in modified gravity turns out to be consistent with observations. Thus, we show that the same modified gravity can solve at once three problems: a consistent description of the maximal mass of a neutron star, a realistic mass-radius relation, and a method to account for hyperons in the equation of state.