Abstract
An alternative to a cosmological constant is quintessence, defined as a slowly-varying scalar field potential V(ϕ). If quintessence is observationally significant, an epoch of inflation is beginning at the present epoch, with ϕthe slowly-rolling inflaton field. In contrast with ordinary inflation, quintessence seems to require extreme fine tuning of the potential V(ϕ). The degree of fine-tuning is quantified in various cases.
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