2000 (IPP)
Permanent URI for this collectionhttp://localhost:4000/handle/11007/629
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Item New cosmological model of quintessence and dark matter(2000-01-14) Sahni, Varun; Wang, LiminWe propose a new class of quintessence models in which late times oscillations of a scalar field give rise to an effective equation of state which can be negative and hence drive the observed acceleration of the universe. Our ansatz provides a unified picture of quintessence and a new form of dark matter we call Frustrated Cold Dark Matter (FCDM). FCDM inhibits gravitational clustering on small scales and could provide a natural resolution to the core density problem for disc galaxy halos. Since the quintessence field rolls towards a small value, constraints on slow-roll quintessence models are safely circumvented in our model.