581 citations · 5.9k across the 106 of their papers we have counts for
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Phantom Dark Energy, Cosmic Doomsday, and the Coincidence Problem
Robert J. Scherrer
Phantom dark energy models, with w < -1, are characterized by a future singularity and therefore a finite lifetime for the universe. Because the future singularity is triggered by…
Do Fermions and Bosons Produce the Same Gravitational Field?
John D. Barrow, Robert J. Scherrer
We examine some cosmological consequences of gravity coupling with different strength to fermions and bosons. We show that this leads to a different perturbation of the standard pi…
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…
Purely kinetic k-essence as unified dark matter
Robert J. Scherrer
We examine k-essence models in which the Lagrangian p is a function only of the derivatives of a scalar field phi and does not depend explicity on phi. The evolution of phi for an…