Maximal neutron star mass and the resolution of the hyperon puzzle in modified gravity

By Artyom V. Astashenok, Salvatore Capozziello, Sergei D. Odintsov. 2014

154 citations recorded by the source corpus.

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 $f(R) = R+\alpha R^2+ \beta R^3$. The soft hyperon equation of state under consideration is usually treated as non-realistic in the standard General Relativity. The numerical analysis of Mass-Radius relation for massive neutron stars with 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: consistent description of the maximal mass of neutron star, realistic Mass-Radius relation and account for hyperons in equation of state.

Subfields: Astronomy and Astrophysics, Oceanography

View Paper: https://www.semanticscholar.org/paper/03ff18c823c9ded70d3e88ed54eff6ae70d4b99b

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Citations in the corpus

Strangeness in nuclei and neutron stars (2020, methodology): “And, finally, alternative solutions to the hyperon puzzle have been discussed, such as the use of modified gravity models in order to present a consistent description of the maximal mass of neutron star while accommodating hyperons in the interior of NSs [398].”
Stellar structure models in modified theories of gravity: Lessons and challenges (2019, background): “[236] in order to alleviate the hyperonic puzzle.”
Testing black hole candidates with electromagnetic radiation (2015, background): “…& Jonker, 2014) f(M) = K3cT 2πGN = M3 sin3 i (M +Mc) 2 , (8) where Kc = vc sin i is the maximum line-of-sight Doppler velocity of the companion star, vc is the velocity of the 4 In alternative theories of gravity, this bound may somewhat change (Astashenok et al., 2014; Doneva et al., 2013).”