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astro-ph2002
Causality and Sound Speed for General Scalar Field Models, including w < -1, tachyonic, phantom, k-essence and curvature corrections
Axel de la Macorra, Hector Vucetich
The result from the SN1a projects suggest that the dark energy can be represented by a fluid with w<-1. However, it is commonly argued that a fluid with |w|>1 contradicts causality…
astro-ph2002★ 1 cited
Cosmology for Scalar Fields with Negative Potentials and w <-1
A. de la Macorra, G. German
We study the cosmology of canonically normalized scalar fields that lead to an equation of state parameter of w_ϕ=p_ϕ/ρ_ϕ<-1 without violating the weak energy condition: rho=Σ_iρ_i…