Evolution of expansion-free massive stellar object in f(R, T) gravity

This paper explores an expansion-free model of a cluster of stars in the f ( R ,  T ) gravity. We consider a dissipative anisotropic viscous model of the star cluster. The mathematical modeling of a cluster of stars involving field equations, junction condition and dynamical equations is presented....

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Bibliographic Details
Published in:European physical journal plus Vol. 138; no. 2; p. 134
Main Authors: Manzoor, Rubab, Ramzan, Kashif, Farooq, M. Asim
Format: Journal Article
Language:English
Published: Berlin/Heidelberg Springer Berlin Heidelberg 08.02.2023
Springer Nature B.V
Subjects:
Anisotropy
Applied and Technical Physics
Astrophysics
Atomic
Complex Systems
Condensed Matter Physics
Cosmology
Dark energy
Dark matter
Dissipation
Evolution
Geometry
Gravity
Mathematical and Computational Physics
Mathematical models
Molecular
Optical and Plasma Physics
Physics
Physics and Astronomy
Regular Article
Shear
Star clusters
Stars
Stars & galaxies
Theoretical
Theory of relativity
Universe
Velocity
Viscosity
ISSN:2190-5444, 2190-5444
Online Access:Get full text
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Summary:This paper explores an expansion-free model of a cluster of stars in the f ( R ,  T ) gravity. We consider a dissipative anisotropic viscous model of the star cluster. The mathematical modeling of a cluster of stars involving field equations, junction condition and dynamical equations is presented. The circumferential and relative radial velocities of the evolving layers of fluids are used to describe the physical meaning of expansion and shear effects. It is concluded that the expansion-free evolution of the star cluster contains a vacuum cavity within it. The relative velocity between the neighboring layers of fluids determines the cluster’s expansion-free and shear-free collapse. The Skripkin model with constant density is equivalent to the non-dissipative expansion-free isotropic star cluster. For the shear-free scenario, this model demonstrates homologous evolution. Finally, it is found that the f ( R ,  T ) gravitational terms indicating dark matter’s contribution to a star cluster have a significant impact on the dynamics of expansion-free evolution.
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ISSN:2190-5444
2190-5444
DOI:10.1140/epjp/s13360-023-03734-7