Brane Quintessence

Details Brane Quintessence Brane Quintessence

2000-12-14

arxiv.org/abs/astro-ph/0012313v1

Phys.Rev. D64 (2001) 123525

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevD.64.123525

We propose a new quintessence scenario in the brane cosmology, assuming that a quintessence field $Q$ is confined in our 3-dimensional brane world. With a potential $V(Q)= \mu^{\alpha+4} Q^{-\alpha}~(\alpha\geq 2)$, we find that the density parameter of the scalar field decreases as $\Omega_Q \sim a^{-4(\alpha-2)/(\alpha+2)}$ in the epoch of quadratic energy density dominance, if $\alpha\leq 6$. This attractor solution is followed by the usual tracking quintessence scenario after a conventional Friedmann universe is recovered. With an equipartition of initial energy density, we find a natural and successful quintessence model for $\alpha\gsim 4$.

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