Galactic dynamics in the presence of scalaron: a perspective from f(R) gravity

We consider f ( R ) modified gravity theory incorporating the chameleon mechanism to address galactic dynamics. By employing the metric formalism and utilizing a conformal transformation, we simplify the field equations and describe the extra degree of freedom f R via a scalar field (scalaron) with...

Full description

Saved in:
Bibliographic Details
Published inPhysica scripta Vol. 99; no. 9; pp. 95025 - 95047
Main Authors Mohan, Gayatri, Dev Goswami, Umananda
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.09.2024
Subjects
Chameleon mechanism
conformal transformation
Modified gravity theory
rotation curves
Scalaron
Online AccessGet full text

Cover

More Information
Summary:We consider f ( R ) modified gravity theory incorporating the chameleon mechanism to address galactic dynamics. By employing the metric formalism and utilizing a conformal transformation, we simplify the field equations and describe the extra degree of freedom f R via a scalar field (scalaron) with chameleonic behavior. A recently proposed f ( R ) model is analyzed to illustrate this behavior effectively. Subsequently, the rotational velocity equation including the scalaron’s contribution is derived for a test particle in a static, spherically symmetric spacetime. Then we generate rotation curves and fit them to observational data of thirty seven galaxies using two fitting parameters, M 0 and r c , the total mass and core radius of a galaxy respectively.
Bibliography:PHYSSCR-130670.R2
ISSN:0031-8949
1402-4896
DOI:10.1088/1402-4896/ad6d0d