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We report a significant finding in Quintessence theory that the the scalar fields with tracker potentials have a model-independent scaling behaviour in the expanding universe. So far widely discussed exponential, power law or hyperbolic potentials can simply mimic the tracking behaviour over a limited range of redshift. In the small redshift range where the variation of the tracking parameter \ may be taken to be negligible, the differential equation of generic potentials leads to hyperbolic sine and hyperbolic cosine potentials which may approximate tracker field in the present day universe. We have plotted the variation of tracker potential and the equation of state of the tracker field as function of the redshift z for the model-independent relation derived from tracker field theory; we have also plotted the variation of V (\) in terms of the scalar field \ for the chosen hyperbolic cosine function and have compared with the curves obtained by reconstruction of V (\) from the real observational data from the supernovae.
V. B. Johri (2002) studied this question.