Stable and self consistent charged gravastar model within the framework
  of $f(R,\,T)$ gravity
  In this work, we discuss the configuration of a gravastar (gravitational
vacuum stars) in the context of $f(R, \,T )$ gravity by employing the
Mazur-Mottola conjecture [P. Mazur and E. Mottola, Report No. LA-UR-01-5067; P.
Mazur and E. Mottola, Proc. Natl. Acad. Sci. USA $101$, $9545$ ($2004$)].
Gravastar is conceptually a substitute for a black hole theory as available in
literature and it has three regions with different equation of states. By
assuming that the gravastar geometry admits conformal killing vector, the
Einstein-Maxwell field equations have been solved in different regions of
gravastar by taking a specific equation of state as proposed by Mazur and
Mottola. We match our interior spacetime to the exterior spherical region which
is completely vacuum and described by Reissner-Nordstr\"{o}m geometry. For a
particular choice of $f(R,\,T)$ as $f(R, \,T )=R+2\gamma T$, here we analyze
various physical properties of the thin shell and also presented our results
graphically for these properties. The stability analysis of our present model
is also studied by introducing a new parameter $\eta$ and we explored the
stability regions. Our proposed gravastar model in presence of charge might be
treated as a successful stable alternative of the charged black hole in the
context of this gravity.
