386 citations
- University of California, Santa BarbaraUS20 papers
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- University of GenevaCH19 papers
- Argonne National LaboratoryUS18 papers
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- National and Kapodistrian University of AthensGR18 papers
- University College LondonGB18 papers
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6 papers · 2 filters
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…
CMB power spectrum contribution from cosmic strings using field-evolution simulations of the Abelian Higgs model
Neil Bevis, Mark Hindmarsh, Martin Kunz +1
We present the first field-theoretic calculations of the contribution made by cosmic strings to the temperature power spectrum of the cosmic microwave background (CMB). Unlike prev…