Constraints on linear-negative potentials in quintessence and phantom models from recent supernova data

By L. Perivolaropoulos. 2004

205 citations recorded by the source corpus.

We study quintessence and phantom field theory models based on linear-negative potentials of the form V({phi})=s{phi}. We investigate the predicted redshift dependence of the equation of state parameter w(z) for a wide range of slopes s in both quintessence and phantom models. We use the Gold data set of 157 SnIa and place constraints on the allowed range of slopes s. We find s=0{+-}1.6 for quintessence and s={+-}0.7{+-}1 for phantom models (the range is at the 2{sigma} level and the units of s are in {radical}(3)M{sub P}H{sub 0}{sup 2}{approx_equal}10{sup -38} eV{sup 3} where M{sub P} is the Planck mass). In both cases the best fit is very close to s{approx_equal}0 corresponding to a cosmological constant. We also show that specific model independent parametrizations of w(z) which allow crossing of the phantom divide line w=-1 (hereafter PDL) provide significantly better fits to the data. Unfortunately such crossings are not allowed in any phantom or quintessence single field model minimally coupled to gravity. Mixed models (coupled phantom-quintessence fields) can in principle lead to a w(z) crossing the PDL but a preliminary investigation indicates that this does not happen for natural initial conditions.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/0c7a5219737408e28d6cb59af63d1840b84aacd6

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Citations in the corpus

Observational constraints on teleparallel dark energy (2011, unknown): “2) is expanded as [98] χ(2)SN = A− 2μ0B + μ(2)0C , (A.”
Stability of phantom wormholes (2005, background): “However, recent fits to supernovae, CMB and weak gravitational lensing data indicate that an evolving equation of state ω crossing the phantom divide−1, is mildly favored, and several models have been proposed in the literature [6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16].”
Transition redshift: new kinematic constraints from supernovae (2008, background): “…or still, as it has been recently discussed, it may violate the dominant energy condition and assume values < −1 when the extra component is named phantom cosmology (Caldwell 2002; Lima et al. 2003; Perivolaropoulos 2005; Gonzalez-Diaz & Siguenza 2004; Lima & Alcaniz 2004; Santos & Lima 2008).”