On the Role of Electric Charge and Cosmological Constant in Structure   Scalars
  The physical meaning of structure scalars is analyzed for charged dissipative spherical fluids and for neutral dust in the presence of cosmological constant. The role played by such factors in the structure scalars is clearly brought out and physical consequences are discussed. Particular attention needs to be paid to the changes introduced by the above mentioned factors in the inhomogeneity factor and the evolution of the expansion scalar and the shear tensor. 
L. Herrera, A. Di Prisco and J. Iba\~nez
gr-qc astro-ph.CO