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Novel Stellar Astrophysics from Extended Gravity

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arxiv 2106.01234 v1 pith:P66ORWXV submitted 2021-06-02 gr-qc

A.V. Astashenok , S. Capozziello , S.D. Odintsov , V.K. Oikonomou This is my paper · ORCID
classification gr-qc
keywords neutroneventgravitygw190814largemassstarsextended
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abstract

Novel implications on neutron stars come from extended gravity. Specifically, the GW190814 event indicated the probability of having large mass stars in the mass-gap region $2.5-5\, M_{\odot}$. If the secondary component of GW190814 is a neutron star, such large masses are marginally supported by General Relativity (GR), since a very stiff Equation of State (EoS) would be needed to describe such large mass neutron stars, which would be incompatible with the GW170817 event, without any modification of gravity. In view of the two groundbreaking gravitational wave observations, we critically discuss the elevated role of extensions of GR towards the successful description of the GW190814 event, and we also speculate in a quantitative way on the important issue of the largest allowed neutron star mass.

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  1. I-Love-Q relations for Neutron Stars with Dark Energy

    gr-qc 2025-06 conditional novelty 5.0 of 10

    I-Love-Q universal relations remain valid within about 1% for neutron stars whose equation of state includes a coupled dark energy fluid in Lambda-CDM and quintessence-like models.

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