@inproceedings{Steinhardt1998CosmologicalTS,
title={Cosmological Tracking Solutions},
author={Paul J. Steinhardt and Limin Wang and Ivaylo Zlatev},
year={1998}
}

Quintessence has been proposed as the missing energy component that must be added to the baryonic and matter density in order to reach the critical density. 3 Quintessence is a dynamical, slowly-evolving, spatially inhomogeneous component with negative pressure. An example is a scalar field Q slowly rolling down its potential V (Q). 4–11 For a general scalar field, the pressure is pQ = 12 Q̇ 2−V , and the energy density is ρQ = 12 Q̇ +V . For a slowly rolling scalar field, the pressure can be… CONTINUE READING