Impact of dynamical dark energy on the neutron star equilibrium

We study the density distribution of the minimally-coupled scalar field dark energy inside a neutron star. The dark energy is considered in the hydrodynamical representation as a perfect fluid with three parameters (background density, equation of state, and effective sound speed). The neutron star...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2021-02, Vol.2021 (2), p.45-45
Main Authors: Smerechynskyi, S., Tsizh, M., Novosyadlyj, B.
Format: Article
Language:English
Subjects:
Dark energy
Density distribution
Energy distribution
Equations of state
Light speed
Neutron stars
Neutrons
Parameters
Scalars
Sound
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Summary:We study the density distribution of the minimally-coupled scalar field dark energy inside a neutron star. The dark energy is considered in the hydrodynamical representation as a perfect fluid with three parameters (background density, equation of state, and effective sound speed). The neutron star matter is modeled with three unified equations of state, developed by the Brussels-Montreal group. With the calculated density distribution of the dark energy inside a neutron star (and its dependence on the dark energy parameters) we investigate how its presence impacts the macroscopic characteristics and the value of the mass limit for neutron stars. From this impact we derive the possible constraints on the effective speed of sound of dark energy with the help of maximal known masses of observed neutron stars. In this approach, we have found, that the squared effective speed of sound can not be smaller than ∼10−2 in units of squared speed of light.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2021/02/045