Possible dark energy imprints in gravitational wave spectrum of mixed neutron-dark-energy stars

TL;DR

This paper investigates how dark energy within neutron stars influences their oscillation spectra, suggesting potential observational signatures for detecting dark energy effects in such stars.

Contribution

It introduces a model for mixed neutron-dark-energy stars and analyzes their oscillation spectra, highlighting the impact of dark energy on observable frequencies.

Findings

Oscillation frequencies are significantly affected by dark energy content.

The fundamental and overtone modes vary with dark energy proportion.

Results suggest possible methods to detect dark energy in neutron stars.

Abstract

In the present paper we study the oscillation spectrum of neutron stars containing both ordinary matter and dark energy in different proportions. Within the model we consider, the equilibrium configurations are numerically constructed and the results show that the properties of the mixed neuron-dark-energy star can differ significantly when the amount of dark energy in the stars is varied. The oscillations of the mixed neuron-dark-energy stars are studied in the Cowling approximation. As a result we find that the frequencies of the fundamental mode and the higher overtones are strongly affected by the dark energy content. This can be used in the future to detect the presence of dark energy in the neutron stars and to constrain the dark-energy models.