Anisotropic Cosmological Model with a Generalized Chaplygin Gas

•(d) Acceleration due to non gravitational force like pressure gradientis a vector defined by!Ya= Ya;bYbwhich is orthogonal toY a*The trace of the tidal tensor (Raychaudhury scalar)(if positive we call it the strong energy condition)ˆ $ #R Y Y = 4"G(! +$#3P).