220 citations · 418 across the 6 of their papers we have counts for
7 papers · 1 filter
Phantom Dark Energy Models with a Nearly Flat Potential
Robert J. Scherrer, A. A. Sen
We examine phantom dark energy models produced by a field with a negative kinetic term and a potential that satisfies the slow roll conditions: [(1/V)(dV/dphi)]^2 << 1 and (1/V)(d^…
Evolution of Oscillating Scalar Fields as Dark Energy
Sourish Dutta, Robert J. Scherrer
Oscillating scalar fields, with an oscillation frequency much greater than the expansion rate, have been proposed as models for dark energy. We examine these models, with particula…
Thawing quintessence with a nearly flat potential
Robert J. Scherrer, A. A. Sen
The thawing quintessence model with a nearly flat potential provides a natural mechanism to produce an equation of state parameter, w, close to -1 today. We examine the behavior of…
The Weak Energy Condition and the Expansion History of the Universe
A. A. Sen, Robert J. Scherrer
We examine flat models containing a dark matter component and an arbitrary dark energy component, subject only to the constraint that the dark energy satisfies the weak energy cond…
Radiation can never again dominate Matter in a Vacuum Dominated Universe
Lawrence M. Krauss, Robert J. Scherrer
We demonstrate that in a vacuum-energy-dominated expansion phase, surprisingly neither the decay of matter nor matter-antimatter annihilation into relativistic particles can ever c…
Constraints on Non-Standard Recombination from Recent CMB Observations
Angela M. Linn, Robert J. Scherrer
We examine cosmic microwave background constraints on variations in the recombination history of the universe. We use a very general extension to the standard model of recombinatio…