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Scalar Field Models for an Expanding Universe
Varun Sahni
IUCAA, Ganeshkind, Pune, India
I examine eld theory models which can give rise to an accelerated
expansion (quintessence) at a late epoch. The models examined
have the unique feature that oscillations of the scalar eld lead to
an equation of state that can be negative. A unied treatment of
quintessence and CDM based on these models is also discussed.
Additionally I show how a simple and elegant model-independent
ansatz can be used to reconstruct the cosmic equation of state
from a knowledge of the luminosity distance as inferred from high-
z Supernovae observations.
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