Quintessence as a run-away dilaton

Details Quintessence as a run-away dilaton Quintessence as a run-away dilaton

2001-08-04

arxiv.org/abs/gr-qc/0108016v2

Phys.Rev. D65 (2002) 023508

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

31 pages, latex, 5 figures included using epsfig. New references added and misprints corrected. To appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.65.023508

We consider a late-time cosmological model based on a recent proposal that the infinite-bare-coupling limit of superstring/M-theory exists and has good phenomenological properties, including a vanishing cosmological constant, and a massless, decoupled dilaton. As it runs away to $+ \infty$, the dilaton can play the role of the quintessence field recently advocated to drive the late-time accelerated expansion of the Universe. If, as suggested by some string theory examples, appreciable deviations from General Relativity persist even today in the dark matter sector, the Universe may smoothly evolve from an initial "focusing" stage, lasting untill radiation--matter equality, to a "dragging" regime, which eventually gives rise to an accelerated expansion with frozen $\Omega(\rm{dark energy})/\Omega(\rm{dark matter})$.

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