840 citations · 3.6k across the 110 of their papers we have counts for
4 papers · 1 filter
Precision cosmological measurements: independent evidence for dark energy
Greg Bothun, Stephen D. H. Hsu, Brian Murray
Using recent precision measurements of cosmological paramters, we re-examine whether these observations alone, independent of type Ia supernova surveys, are sufficient to imply the…
Gradient instability for w < -1
Stephen D. H. Hsu, Alejandro Jenkins, Mark B. Wise
We show that in single scalar field models of the dark energy with equations of state satisfying , the effective Lagrangian for fluctuations about the homogeneo…
Quintessence and Thermal Matter
S. Hsu, B. Murray
We investigate the effects of thermal interactions on tracking models of quintessence. We show that even Planck-suppressed interactions between matter and the quintessence field ca…
Cosmology of Nonlinear Oscillations
Stephen D. H. Hsu
The nonlinear oscillations of a scalar field are shown to have cosmological equations of state with ranging from . We investigate the possibility that the d…