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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…
Dark Group: Dark Energy and Dark Matter
Axel de la Macorra
We study the possibility that a dark group, a gauge group with particles interacting with the standard model particles only via gravity, is responsible for containing the dark ener…
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…
Implications to CMB from Model Independent evolution of w and Late Time Phase Transition
Axel de la Macorra
We present model independent determination of the CMB from any kind of fluid that has an equation of state taking four different values. The first region has , the second $w…