6,710 research outputs found
Evolution of Compact Stars and Dark Dynamical Variables
This work is aimed to explore the dark dynamical effects of modified
gravity theory on the dynamics of compact celestial star. We have taken the
interior geometry as spherical star which is filled with imperfect fluid
distribution. The modified field equations are explored by taking a particular
form of model, i.e., . These equations are
then utilized to formulate the well-known structure scalars under the dark
dynamical effects of this higher order gravity theory. Also, the evolution
equations for expansion and shear are formulated with the help of these scalar
variables. Further, all this analysis have been made under the condition of
constant and . We found a crucial significance of dark source terms and
dynamical variables on the evolution and density inhomogeneity of compact
objects.Comment: 18 pages, 4 figures, version accepted for publication in European
Physical Journal
Influence of Models on the Existence of Anisotropic Self-Gravitating Systems
This paper aims to explore some realistic configurations of anisotropic
spherical structures in the background of metric gravity, where is
the Ricci scalar. The solutions obtained by Krori and Barua are used to examine
the nature of particular compact stars with three different modified gravity
models. The behavior of material variables is analyzed through plots and the
physical viability of compact stars is investigated through energy conditions.
We also discuss the behavior of different forces, equation of state parameter,
measure of anisotropy and Tolman-Oppenheimer-Volkoff equation in the modeling
of stellar structures. The comparison from our graphical representations may
provide evidences for the realistic and viable gravity models at both
theoretical and astrophysical scale.Comment: 23 pages, 13 figures, version accepted for publication in European
Physical Journal
Existence of Compact Structures in Gravity
The present paper is devoted to investigate the possible emergence of
relativistic compact stellar objects through modified gravity. For
anisotropic matter distribution, we used Krori and Barura solutions and two
notable and viable gravity formulations. By choosing particular
observational data, we determine the values of constant in solutions for three
relativistic compact star candidates. We have presented some physical behavior
of these relativistic compact stellar objects and some aspects like energy
density, radial as well as transverse pressure, their evolution, stability,
measure of anisotropy and energy conditions.Comment: 27 pages, 13 figures, version accepted for publication in European
Physical Journal
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