76 citations · 168 across the 5 of their papers we have counts for
5 papers
Optimized supernova constraints on dark energy evolution
Christian Stephan-Otto
A model-independent method to study the possible evolution of dark energy is presented. Optimal estimates of the dark energy equation of state w are obtained from current supernova…
Tracking Dark Energy with the ISW effect: short and long-term predictions
Levon Pogosian, Pier Stefano Corasaniti, Christian Stephan-Otto +2
We present an analysis of the constraining power of future measurements of the Integrated Sachs-Wolfe (ISW) effect on models of the equation of state of dark energy as a function o…
Cosmological stretching of perturbations on a cosmic string
Christian Stephan-Otto, Ken D. Olum, Xavier Siemens
We investigate the effects of cosmological expansion on the spectrum of small-scale structure on a cosmic string. We simulate the evolution of a string with two modes that differ i…
Quintessence Restrictions on Negative Power and Condensate Potentials
A. de la Macorra, C. Stephan-Otto
We study the cosmological evolution of scalar fields that arise from a phase transition at some energy scale $\Lm_c$. We focus on negative power potentials given by $V=c\Lm_c^{4+n}…
Natural Quintessence with Gauge Coupling Unification
A. de la Macorra, C. Stephan-Otto
We show that a positive accelerating universe can be obtained simply by the dynamics of a non-abelian gauge group. It is the condensates of the chiral fields that obtain a negative…