Role of Chameleon Field in presence of Variable Modified Chaplygin gas   in Brans-Dicke Theory
  In this work, we have considered FRW model of the universe for Brans-Dicke (BD) theory with BD scalar field as a Chameleon field. First we have transformed the field equations and conservation equation from Jordan's frame to Einstein's frame. We have shown in presence of variable modified Chaplygin gas, the potential function $V$ and another analytic function $f$ always increase with respect to BD-Chameleon scalar field $\phi$. 
Shuvendu Chakraborty and Ujjal Debnath
physics.gen-ph