Axially-symmetric Neutron stars: Implication of rapid rotation

TL;DR

This paper models relativistic rotating neutron stars with hyperon-rich matter, analyzing how hyperons influence the equation of state and stellar properties, and finds that such stars can sustain faster rotations up to 50% without deformation.

Contribution

It introduces a framework for modeling hyperon-rich neutron stars under rapid rotation, demonstrating their ability to sustain higher rotational frequencies.

Findings

Models explain fast rotations supporting millisecond pulsars.

Stars can sustain up to 50% increase in rotational frequency without deformation.

Hyperon presence significantly affects the equation of state and stellar properties.

Abstract

Models of relativistic rotating neutron star composed of hyperon rich matter is constructed in the framework of an effective field theory in the mean-field approach. The gross properties of compact star is calculated at both static and the mass-shedding limit in the axially symmetric basis. The effect of appearance and abundance of hyperons on equation of state of dense matter and stellar properties is lineated with particular emphasis on the underlying nuclear interactions. We find that the models can explain fast rotations, which supports the existence of millisecond pulsars. An important offshoot of the present investigation is that, irrespective of the model parameters and interaction taken, the star seems to sustain faster rotations (an increase in rotational frequency up to $\approx$ 50%) without any further deformation.