Abstract
In the present paper we investigate tachyonic chameleon scalar field and present the phase space analysis for four different combinations of the tachyonic potential $$V(\phi )$$ and the coupling function $$f(\phi )$$ of the chameleon field with matter. We find some stable solution in which accelerated expansion of the universe is satisfied. In one case where both $$f(\phi )$$ and $$V(\phi )$$ are exponential a scaling attractor was found that can give rise to the late-time acceleration of the universe and alleviate the coincidence problem.
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