Statefinder Diagnostic for Variable Modified Chaplygin Gas in LRS Bianchi Type I Universe

The Locally Rotationally Symmetric (LRS) Bianchi type I cosmological model with variable modified Chaplygin gas having the equation of state p = A rho - B/rho(alpha), where 0 <= alpha <= 1, A is a positive constant, and B is a positive function of the average-scale factor a(t) of the universe (i.e., B = B(a)) has been studied. It is shown that the equation of state of the variable modified Chaplygin gas interpolates from radiation-dominated era to quintessence-dominated era. The statefinder diagnostic pair (i.e., {r, s} parameter) is adopted to characterize different phases of the universe.