Observation of Cosmic Acceleration and Determining the Fate of the Universe

Details Observation of Cosmic Acceleration and Determining the Fate of the Universe Observation of Cosmic Acceleration and Determining the Fate of the Universe

1999-01-29

arxiv.org/abs/astro-ph/9901405v4

Phys.Rev.Lett. 83 (1999) 1510-1513

Astronomy and Astrophysics

Astrophysics

4 pages;important changes in conclusion; published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.83.1510

Current observations of Type Ia supernovae provide evidence for cosmic acceleration out to a redshift of $z \lsim 1$, leading to the possibility that the universe is entering an inflationary epoch. However, inflation can take place only if vacuum-energy (or other sufficiently slowly redshifting source of energy density) dominates the energy density of a region of physical radius 1/H. We argue that for the best-fit values of $\Omega_\Lambda$ and $\Omega_m$ inferred from the supernovae data, one must confirm cosmic acceleration out to at least $z \simeq 1.8$ to infer that the universe is inflating.

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