Abstract
We study the cosmological evolution of a tachyon scalar field T with a Dirac- Born- Infeld type lagrangian and potential V (T) coupled to a canonically normalized scalar field with an arbitrary but factorizeable interaction potential B (T,phi) in the presence of a barotropic fluid. We will assume that the force between the barotropic fluid and the scalar field is only gravitational and we show that all models dependence is given in terms of three parameters: L1= -V_T/V, L2= -B_T/B and L3= -B_phi/B which are field and time dependent. We give the general solution to the cosmological equations of motion and determine in which cases we can have an accelerating universe giving rise to dark energy.
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