Model independent approach to the dark energy equation of state

By Pier Stefano Corasaniti, Edmund J. Copeland. 2002

147 citations recorded by the source corpus.

The consensus of opinion in cosmology is that the Universe is currently undergoing a period of accelerated expansion. With current and proposed high precision experiments it offers the hope of being able to discriminate between the two competing models that are being suggested to explain the observations, namely a cosmological constant or a time dependent ``quintessence'' model. The latter suffers from a plethora of scalar field potentials all leading to similar late time behavior of the universe and, hence, to a lack of predictability. In this paper, we develop a model independent approach which simply involves parametrizing the dark energy equation of state in terms of known observables. This allows us to analyze the impact dark energy has had on cosmology without the need to refer to particular scalar field models and opens up the possibility that future experiments will be able to constrain the dark energy equation of state in a model independent manner.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/4e9c9f5e57006e6c561362b4d5cdeae524042fbf

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Citations in the corpus

Smoothing supernova data to reconstruct the expansion history of the universe (2005, background): “Corasaniti & Copeland (2003) suggested a four-parameter ansatz for the equation of state.”
The dynamics of quintessence, the quintessence of dynamics (2007, methodology): “The kink model (Corasaniti & Copeland, 2003) takes this in scale factor a, obtaining w(a) = w0 + (wm − w0) 1 + eat/∆ 1 − e1/∆ 1 − e(1−a)/∆ 1 + e(at−a)/∆ , (33) where wm is the asymptotic value in the matter dominated era and ∆ is related to the rapidity, while the efold model (Linder & Huterer,…”
Dark Energy and the Accelerating Universe (2008, unknown): “More general expressions have been proposed, for example, Padé approximants and the transition between two asymptotic values w0 (at z → 0) and w f (at z → ∞), w(z) = w0 + (w f −w0)/(1+ exp[(z − zt)/0]) (Corasaniti & Copeland 2003).”
Is there supernova evidence for dark energy metamorphosis (2003, background): “(ii) The non-perturbative w(z) suggested in Corasaniti & Copeland (2003) and Corasaniti et al. (2003), which has the parameters w0Q (the DE equation of state today), w m Q (the DE equation of state at the matter dominated epoch), zc (the redshift where equation of state changes from wmQ to w 0 Q),…”