Do Type Ia Supernovae Provide Direct Evidence for Past Deceleration of the Universe?
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Observations of SN 1997ff at z ~ 1.7 favor the accelerating universe interpretation and provide some direct evidence that the universe was once decelerating. We show that the strength of this conclusion depends upon the nature of the dark energy causing the present acceleration. Only for a cosmological constant is the SNe evidence definitive. Using a new test which is independent of the contents of the universe, we show that the SN data favor recent acceleration (z < 0.5) and past deceleration (z > 0.5).
View Paper: https://www.semanticscholar.org/paper/a8bb5a3abdb0c5232dfe8baeab1ba27580f0d898
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Citations in the corpus
- What Do We Really Know about Cosmic Acceleration? (2005, background): “563 include the cosmic scale factor R(t) (John 2004, 2005, 2006), the expansion rateH(z) (Lazkoz et al. 2005;Wang&Tegmark 2005), and the deceleration parameter q(z) ¼ d lnH /d ln (1þ z)½ 1 (Turner & Riess 2002; Elgaroy & Multamaki 2006).”