## Abstract

The implications of seven popular models of quintessence based on supergravity or M/string theory for the transition from a decelerating to an accelerating universe are explored. All seven potentials can mimic the ΛCDM model at low redshifts 0 ≤ z ≤ 5. However, for a natural range of initial values of the quintessence field, the SUGRA and Polónyi potentials predict a transition redshift z_{t} ≈ 0.5 for Ω_{Λ0}, in agreement with the observational value z_{t} ≈ 0.46 and in mild conflict with the ΛCDM value z_{t} = 0.67. Tables are given for the quintessence potentials for the recent average ̄w_{0} of the equation of state parameter, and for w_{0} and w_{1} in the low-z approximation w ≈ w_{0} + w_{1}z. It is argued that for the exponential potential e^{λφ} to produce a viable present-day cosmology, λ ≤ 2. A robust, scaled numerical method is presented for simulating the cosmological evolution of the scalar field.

Original language | English (US) |
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Pages (from-to) | 278-300 |

Number of pages | 23 |

Journal | Nuclear Physics B |

Volume | 707 |

Issue number | 1-2 |

DOIs | |

State | Published - Feb 14 2005 |

## ASJC Scopus subject areas

- Nuclear and High Energy Physics