Stability of thin-shell interfaces inside compact stars
  We use the thin-shell Darmois-Israel formalism to model and assess the stability of the interfaces separating phases, e.g. the core and the crust, within compact stars. We exemplify the relevance and non-triviality of this treatment in the simplest case of an incompressible star, in constant pressure phase transitions, and in the case of strange quark stars with crust. 
Jonas P. Pereira, Jaziel G. Coelho, Jorge A. Rueda
gr-qc astro-ph.SR nucl-th