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- Title
Dynamical analysis of radiating spherical collapse in Palatini f( R) gravity.
- Authors
Sharif, M.; Yousaf, Z.
- Abstract
We discuss dynamical instability of non-adiabatic anisotropic collapse of spherical self-gravitating systems through collapse equation in Palatini f( R) gravity. We take R+ ϵR model and assume hydrostatic equilibrium of celestial object at large past time such that T(−∞)=0. Considering perturbation from hydrostatic phase, and linearizing the dynamical as well as field equations, we evaluate instability constraints at Newtonian as well as post-Newtonian approximations. We conclude that pressure and heat flow assist collapsing phenomenon while Palatini f( R) dark source terms affect dynamics of self-gravitating object due to its non-attractive nature through stiffness parameter.
- Subjects
PALATINITE; GRAVITY; ANISOTROPY; EQUATIONS of state; HYDROSTATIC equilibrium; NEWTONIAN cosmology
- Publication
Astrophysics & Space Science, 2014, Vol 354, Issue 2, p481
- ISSN
0004-640X
- Publication type
Article
- DOI
10.1007/s10509-014-2116-3