391 citations · 2.5k across the 46 of their papers we have counts for
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astro-ph2005★ 236 cited
Probing Cosmic Acceleration Beyond the Equation of State: Distinguishing between Dark Energy and Modified Gravity Models
Mustapha Ishak, Amol Upadhye, David N. Spergel
If general relativity is the correct theory of physics on large scales, then there is a differential equation that relates the Hubble expansion function, inferred from measurements…
astro-ph2004★ 191 cited
Dynamical dark energy: Current constraints and forecasts
Amol Upadhye, Mustapha Ishak, Paul J. Steinhardt
We consider how well the dark energy equation of state as a function of red shift will be measured using current and anticipated experiments. We use a procedure which takes…