Acceleration at z>1?

Details Acceleration at z>1? Acceleration at z>1?

2002-09-24

arxiv.org/abs/astro-ph/0209494v3

Mon.Not.Roy.Astron.Soc. 342 (2003) 221-226

Astronomy and Astrophysics

Astrophysics

11 pages, submitted to MNRAS. v2: added a ref. v3: another ref

Scientific paper

10.1046/j.1365-8711.2003.06540.x

Most models of dark energy predict the beginning of the accelerated epoch at z <= 1. However, there are no observational or theoretical evidences in favor of such a recent start of the cosmic acceleration. In fact, a model of dark energy coupled to dark matter is explicitely constructed that a) is accelerated even at high z; b) allows structure formation during acceleration; and c) is consistent with the type Ia supernovae Hubble diagram, including the farthest known supernova SN1997ff at z~1.7 . It is shown that the accelerated epoch in this model could have started as early as z~5.

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