Abstract
We study general properties of attractors for tachyonic potential chameleon scalar-field model which possesscosmological scaling solutions. An analytic formulation is given to obtain fixed points with a discussion on their stability. The model predicts a dynamical equation of state parameter with phantom crossing behavior for an accelerating universe. We constrain the parameters of the model by best fitting with therecent data-sets from supernovae and simulated data points for redshiftdrift experiment generated by Monte Carlo simulations.
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