1.5k citations · 12.2k across the 191 of their papers we have counts for
10 papers · 1 filter
An Accelerating Universe from Dark Matter Interactions with Negative Pressure
Paolo Gondolo, Katherine Freese
As an explanation for the acceleration of the universe, we propose dark matter with self-interactions characterized by a negative pressure; there is no vacuum energy whatsoever in…
Observational Tests of Open Strings in Braneworld Scenarios
Katherine Freese, Matthew Lewis, Jan Pieter van der Schaar
We consider some consequences of describing the gauge and matter degrees of freedom in our universe by open strings, as suggested by the braneworld scenario. We focus on the geomet…
The positron excess and supersymmetric dark matter
Edward A. Baltz, Joakim Edsjo, Katherine Freese +1
Using a new instrument, the HEAT collaboration has confirmed the excess of cosmic ray positrons that they first detected in 1994. We explore the possibility that this excess is due…
Fluid Interpretation of Cardassian Expansion
Paolo Gondolo, Katherine Freese
A fluid interpretation of Cardassian expansion is developed. Here, the Friedmann equation takes the form where contains only matter and radiation (no vacuum).…
Generalized Cardassian Expansion: Models in Which the Universe is Flat, Matter Dominated, and Accelerating
Katherine Freese
The Cardassian universe is a proposed modification to the Friedmann Robertson Walker (FRW) equation in which the universe is flat, matter dominated, and accelerating. Here we gener…
Hagedorn Inflation: Open Strings on Branes Can Drive Inflation
Steven Abel, Katherine Freese, Ian Kogan
We demonstrate an inflationary solution to the cosmological horizon problem during the Hagedorn regime in the early universe. Here the observable universe is confined to three spat…