1 citations · 1 across the 2 of their papers we have counts for
4 papers
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…
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…
Constant versus Field Dependent Gauge Couplings in Supersymmetric Theories
C. P. Burgess, A. de la Macorra, I. Maksymyk +1
We briefly discuss the differences between considering the gauge coupling as a constant or as a field, the dilaton, in N=1 supersymmetric theories. We emphasize the differences reg…
Supersymmetric Models with Product Groups and Field Dependent Gauge Couplings
I. Maksymyk, C. P. Burgess, A. de la Macorra +1
The structure of the models of section 3.2 has been found to be richer than previously thought; a revised version has appeared as hep-th/9808087.