(The European Physical Journal C, 2015) Ifra Noureen; M. Zubair; A.A. Bhatti; G. Abbas
The implications of the shear-free condition on
the instability range of an anisotropic fluid in f (R, T ) are
studied in this manuscript. A viable f (R, T ) model is chosen
to arrive at stability criterion, where R is Ricci scalar
and T is the trace of energy-momentum tensor. The evolution
of a spherical star is explored by employing a perturbation
scheme on the modified field equations and contracted
Bianchi identities in f (R, T ). The effect of the imposed
shear-free condition on the collapse equation and adiabatic
index is studied in the Newtonian and post-Newtonian
regimes.