What Do We Really Know About Cosmic Acceleration?

Details What Do We Really Know About Cosmic Acceleration? What Do We Really Know About Cosmic Acceleration?

2005-12-23

arxiv.org/abs/astro-ph/0512586v1

Astrophys.J.649:563-569,2006

Astronomy and Astrophysics

Astrophysics

9 pages, 8 figures

Scientific paper

10.1086/506470

Essentially all of our knowledge of the acceleration history of the Universe - including the acceleration itself - is predicated upon the validity of general relativity. Without recourse to this assumption, we use SNeIa to analyze the expansion history and find (i) very strong (5 sigma) evidence for a period of acceleration, (ii) strong evidence that the acceleration has not been constant, (iii) evidence for an earlier period of deceleration and (iv) only weak evidence that the Universe has not been decelerating since z~0.3.

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