QuintessenceChameleon transitions in anisotropic Kiselev model of neutron stars

Title

QuintessenceChameleon transitions in anisotropic Kiselev model of neutron stars

Creator

Keshav, M. V. Pradosh; Jithesh, V.; Arun, Kenath

Description

We investigate a chameleon scalar field dynamically interacting with a Kiselev-type metric, where the static anisotropic fluid part of the metric is replaced by a density-dependent scalar field nonminimally coupled to curvature. This construction enables a transition from screened behavior in high-density regions where the scalar acquires an effective mass m???1?2 to unscreened quintessence dynamics at large scales, characterized by a critical screening radius rcrit?m??1. By solving the modified TolmanOppenheimerVolkoff equations under spherical symmetry, we show that radial scalar gradients (?r?) induce pressure anisotropies (?p?r?1) in neutron star envelopes, while deviations from general relativity (GR) are suppressed deep in the core (r

Source

International Journal of Modern Physics A;Volume;40;Issue;26;Article No.;2550112;

Date

01-01-2025

Publisher

World Scientific

Subject

chameleon Scalar; compact objects; dark energy; Kiselev metric; neutron star

Coverage

Keshav M.V.P., Department of Physics and Electronics, Christ University, Karnataka, Bangalore, 560029, India; Jithesh V., Department of Physics and Electronics, Christ University, Karnataka, Bangalore, 560029, India; Arun K., Department of Physics and Electronics, Christ University, Karnataka, Bangalore, 560029, India

Rights

All Open Access; Green Open Access

Relation

ISSN: 0217751X; CODEN: IMPAE

Format

online

Language

English

Type

Article

Identifier

https://doi.org/10.1142/S0217751X2550112X

https://www.scopus.com/pages/publications/105011535220?origin=resultslist