Phantom Cosmologies

By V. B. Johri. 2003

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The dynamics of a minimally coupled scalar ﬁeld in the expanding universe is discussed with special reference to phantom cosmology. The evolution of the universe with a phantom ﬁeld vis-a-vis a quintessence ﬁeld is compared. Phantom cosmologies are found to have two special features i) occurrence of a singularity where the scale factor, the energy density and Ricci curvature scalar diverge to inﬁnity. This singularity occurs at a ﬁnite timexs, depending on the value of w during cosmic evolution, ii) degeneracy in the determination of w ( z m ) for a given transition redshift z m which seems to impart similar observational properties to corresponding phantom and quintessence models and makes both of them compatible with the cosmological observations. Although due to the uncertainties in the measurement of the Hubble constant H 0 , the Hubble dependent observational parameters yield only loose constraints over the range of w , the duality in the determination of w with respect to transition redshift may be used to constrain w . An observational test, based upon the observations of low redshift galactic clusters, is suggested to discriminate between the quintessence and phantom dark energy.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/ec9711333a5bea7a52ca57013e994211e923443d

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In Astronomy and Astrophysics

Citations in the corpus

WMAP constraints on low redshift evolution of dark energy (2004, unknown): “…Jassal 2004; Kim, Kim & 2003; Sen 2003; Aguirregabiria & Lazkoz 2004; Gorini et al. 2004), phantom fields (Caldwell 2002; Carroll et al. 2003; Dabrowski et al. 2003; Frampton 2003; Gibbons 2003b; Gonzalez-Diaz 2003b; Hao E-mail: hkj@mri.ernet.in (HKJ); jasjeet@mri.ernet.in (JSB);…”
The Phantom menaced: Constraints on low-energy effective ghosts (2003, background): “More recently, some less conventional alternatives have been considered, including “phantom matter,” which is essentially quintessence with a wrong-sign kinetic term [3].”
A Primer on Energy Conditions (2014, background): “a positive cosmological constant, as in de Sitter spacetime, and the “dark energy” postulated to drive the observed accelerated expansion of the universe [necessarily] [29, 30, 54, 107] 8.”