Novel stellar astrophysics from extended gravity

Article Astronomy & Astrophysics

Causal limit of neutron star maximum mass in f(R) gravity in view of GW190814

A. V. Astashenok et al.

Summary: Investigated the causal limit of maximum mass for stars in the framework of f(R) gravity, numerically examining the combined effect of causal equation of state and sound speed on maximum mass of static neutron stars. This provides the most extreme upper bound for neutron star masses in extended gravity.

PHYSICS LETTERS B (2021)

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Article Astronomy & Astrophysics

Neutron stars phenomenology with scalar-tensor inflationary attractors

S. D. Odintsov et al.

Summary: This work examines the implications of a subclass of E-models cosmological attractors, known as a-attractors, on hydrodynamically stable slowly rotating neutron stars. By numerically solving the Tolman-Oppenheimer-Volkoff equations in the Einstein frame, the study finds that the masses and radii of neutron stars vary with the parameter a characterizing the a-attractors. Results indicate a complex relationship between non-minimal inflationary attractors and neutron star phenomenology in scalar-tensor theory.

PHYSICS OF THE DARK UNIVERSE (2021)

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Article Astronomy & Astrophysics