Is there supernova evidence for dark energy metamorphosis
By Ujjaini Alam, V. Sahni, T. D. Saini, A. Starobinsky. 2003
438 citations recorded by the source corpus.
We reconstruct the equation of state w(z) of dark energy (DE) using a recently released data set containing 172 Type Ia supernovae (SNe) without assuming the prior w(z) ≥−1 (in contrast to previous studies). We find that DE evolves rapidly and metamorphoses from dust-like behaviour at high z (w≃ 0 at z∼ 1) to a strongly negative equation of state at present (w≲−1 at z≃ 0). DE metamorphosis appears to be a robust phenomenon which manifests for a large variety of SNe data samples provided one does not invoke the weak energy prior ρ+p≥ 0. Invoking this prior considerably weakens the rate of growth of w(z). These results demonstrate that DE with an evolving equation of state provides a compelling alternative to a cosmological constant if data are analysed in a prior-free manner and the weak energy condition is not imposed by hand.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/c678d3bbddc29a64c455ad462b163fd6826d3887
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In Astronomy and Astrophysics
- A. Starobinsky
- A. Shafieloo
- V. Sahni
- Ujjaini Alam
- J. Bagla
- H. K. Jassal
- Thanu Padmanabhan
- S. Tsujikawa
Citations in the corpus
- WMAP constraints on low redshift evolution of dark energy (2004, background): “…is by now standard (Amendola & Quercellini 2003; Jimenez 2003; Jimenez et al. 2003; Padmanabhan & Choudhury 2003; Alam, Sahni & Starobinsky 2004a; Alam et al. 2004b; Bassett 2004; Bassett et al. 2004; Choudhury & Padmanabhan 2004; Corasaniti et al. 2004; Daly & Djorgovski 2004; Gong 2004;…”
- The Chaplygin gas as a model for dark energy (2004, neutral): “ar X iv :g rqc /0 40 30 62”
- 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.”