What If w < -1 ?

Details What If w < -1 ? What If w < -1 ?

2002-10-15

arxiv.org/abs/astro-ph/0210321v1

page 265 of the proceedings of the XVIIIth Colloquium of the Institut d'Astrophysique de Paris, July 2002, "On the Nature of D

Astronomy and Astrophysics

Astrophysics

4 pages, improved version of a talk at XVIIIth IAP Colloquium "On the Nature of Dark Energy", Paris, July 2002

Scientific paper

The cosmological "equation of state parameter", w, is equal to -1 for a true cosmological constant, and is greater than -1 for quintessence. There is a widespread reluctance to consider the remaining possibility, w < -1, though in fact there is a variety of theoretical and observational evidence in favour of this range. We briefly discuss some of the objections to w < -1 and show that each of them can readily be circumvented. We also briefly consider what string theory has to say about this.

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