Muhammad SharifShamaila Rani2015-03-052015-03-05201432. Sharif, M., & Rani, S. (2014). Dynamical Instability of Expansion-Free Collapse in f (T) Gravity. International Journal of Theoretical Physics, 1-19.https://escholar.umt.edu.pk/handle/123456789/1436In this paper, we analyze the dynamical instability of a spherically symmetric collapsing star in the context of f (T ) gravity. For this purpose, we assume power-law f (T ) model with non-dissipative anisotropic fluid distribution under expansion-free condition. The perturbation scheme is applied to all matter, metric and f (T ) functions. We formulate dynamical equations using contracted Bianchi identities to investigate dynamical instability ranges in Newtonian and post-Newtonian regimes. It is found that the instability ranges of expansion-free fluid are independent of adiabatic index but depend on radial density profile, anisotropic pressure and torsion terms.enf (T ) gravityInstabilityNewtonianpost-Newtonian regimesArticle