10.9k citations
- University of PittsburghUS1.8k papers
- Yale UniversityUS1.7k papers
- Argonne National LaboratoryUS1.7k papers
- University of OxfordGB1.7k papers
- University of MichiganUS1.7k papers
- University of ChicagoUS1.7k papers
- Michigan State UniversityUS1.7k papers
- University of GenevaCH1.7k papers
- University College LondonGB1.6k papers
- Lawrence Berkeley National LaboratoryUS1.6k papers
- The Ohio State UniversityUS1.6k papers
- Duke UniversityUS1.6k papers
7 papers · 2 filters
Anthropic predictions for vacuum energy and neutrino masses in the light of WMAP-3
Levon Pogosian, Alexander Vilenkin
Anthropic probability distributions for the cosmological constant and for the sum of neutrino masses are updated using the WMAP-3 data release. The new distribution for Lambda is i…
Cosmic string loops in the expanding universe
Ken D. Olum, Vitaly Vanchurin
We study the production of loops in the cosmic string network in the expanding background by means of a numerical simulation exact in the flat-spacetime limit and first-order in th…
Dwarf Galaxies of the Local Group
Rosanne Di Stefano, Roberto Soria, F. A. Primini +1
XMM-Newton and Chandra have ushered in a new era for the study of dwarf galaxies in the Local Group. We provide an overview of the opportunities, challenges, and some early results…
Reionization from cosmic string loops
Ken D. Olum, Alexander Vilenkin
Loops formed from a cosmic string network at early times would act as seeds for early formation of halos, which would form galaxies and lead to early reionization. With reasonable…
The vacuum energy crisis
Alexander Vilenkin
The smallness of the vacuum energy density and its near coincidence with the average matter density of the universe are naturally explained by anthropic selection. An alternative e…
Optimized supernova constraints on dark energy evolution
Christian Stephan-Otto
A model-independent method to study the possible evolution of dark energy is presented. Optimal estimates of the dark energy equation of state w are obtained from current supernova…