A New Cosmological Model of Quintessence and Dark Matter

Details A New Cosmological Model of Quintessence and Dark Matter A New Cosmological Model of Quintessence and Dark Matter

1999-10-05

arxiv.org/abs/astro-ph/9910097v3

Phys.Rev. D62 (2000) 103517

Astronomy and Astrophysics

Astrophysics

Revised. Important new results added in response to referees comments

Scientific paper

10.1103/PhysRevD.62.103517

We 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.

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