Future supernovae data and quintessence models

By E. D. Pietro, J. Claeskens. 2002

163 citations recorded by the source corpus.

The possibility of unambiguously determining the equation of state of the cosmic dark energy with existing and future supernovae data is investigated. We consider four evolution laws for this equation of state corresponding to four quintessential models, i.e. (i) a cosmological constant, (ii) a general barotropic fluid, (iii) a perfect fluid with a linear equation of state and (iv) a more physical model based on a pseudo-Nambu-Goldstone boson field. We explicitly show the degeneracies present not only within each model but also between the different models: they are caused by the multi-integral relation between the equation of state of dark energy and the luminosity distance. Present supernova observations are analysed using a standard Χ 2 method and the minimal Χ 2 values obtained for each model are compared. We confirm the difficulty in discriminating between these models using present type Ia supernovae data only. By means of simulations, we then show that future SNAP observations will not remove all the degeneracies. For example, wrong estimations of Ω m with a good value of Χ 2 m i n could be found if the right cosmological model is not used to fit the data. Finally, we give some probabilities for obtaining unambiguous results, free from degeneracies. In particular, the probability of confusing a cosmological constant with a true barotropic fluid with an equation of state different from -1 is shown to be 95 per cent at a 2σ level.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/91cea5df953a83466d5e8226e1057fed9143fd9a

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In Astronomy and Astrophysics

1. A. Riess
2. A. Filippenko
3. S. Jha
4. R. Kirshner
5. Weidong Li
6. H. Ferguson
7. Christopher J. Conselice
8. Mark Dickinson

In Nuclear and High Energy Physics

1. A. Filippenko
2. Weidong Li
3. S. Jha
4. R. Kirshner
5. J. Tonry
6. A. Riess
7. Daniel J. Eisenstein
8. Mark Dickinson

Citations in the corpus

• New Hubble Space Telescope Discoveries of Type Ia Supernovae at z ≥ 1: Narrowing Constraints on the Early Behavior of Dark Energy (2006, methodology): “The expansion w zð Þ ¼ w0 þ w0z, where w0 dw/dzð Þjz¼0 was proposed by Cooray & Huterer (1999), first used by Di Pietro & Claeskens (2003) and later by R04.”