Parametrization of tachyon dark energy and its potential

The basic equations for reconstructing the potential of tachyon were derived from the equation of state of the dark energy ω_(z).The shapes of the potentials of the tachyon field were numerically reproduced for four typical parametrized models and some discussions on the results were given.In particular,for these four models,the potentials are all monotonous and possess the same asymptotic behavior at low redshift.