The case for dynamical dark energy revisited

By Ujjaini Alam, V. Sahni, A. Starobinsky. 2004

405 citations recorded by the source corpus.

We investigate the behaviour of dark energy using the recently released supernova data of Riess et al 2004 and a model independent parametrization for dark energy (DE). We find that, if no priors are imposed on Ω0m and h, DE which evolves with time provides a better fit to the SNe data than ΛCDM. This is also true if we include results from the WMAP CMB data. From a joint analysis of SNe + CMB, the best fit DE model has w0 −1 at the present epoch and the transition from deceleration to acceleration occurs at zT = 0.39 ± 0.03. However, DE evolution becomes weaker if the ΛCDM based CMB results Ω0m = 0.27 ± 0.04, h = 0.71 ± 0.06 are incorporated in the analysis. In this case, zT = 0.57 ± 0.07. Our results also show that the extent of DE evolution is sensitive to the manner in which the supernova data is sampled.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/0e7028d6ce24e85ea03b2a2e736fd39be89450bf

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Citations in the corpus

Improved Constraints on the Acceleration History of the Universe and the Properties of the Dark Energy (2007, neutral): “This includes the work of Huterer & Starkman (2003), Wang & Tegmark (2004, 2005), Shafieloo et al. (2006), Alam et al. (2004), Nesseris & Perivolaropoulos (2004), Huterer & Cooray (2005), Shapiro&Turner (2006), Turner&Huterer (2007), andAlam et al. (2007), for example.”
f(R) Theories (2010, background): “While the Λ-Cold Dark Matter (ΛCDM) model (f(R) = R− 2Λ) fits a number of observational data well [367, 368], there is also a possibility for the time-varying equation of state of dark energy [10, 11, 450, 451, 630].”
Smoothing supernova data to reconstruct the expansion history of the universe (2005, methodology): “An important result of this paper is the discovery that the w-probe (originally proposed in Alam et al. (2004)) provides us with an excellent diagnostic of dark energy.”
The black hole and cosmological solutions in IR modified Hořava gravity (2009, background): “This looks to be consistent with current observational constraints but it seems to be still too early to decide what the right one is [35].”