CosmoCoffee Forum Index CosmoCoffee

 
 FAQFAQ   SearchSearch  MemberlistSmartFeed   MemberlistMemberlist    RegisterRegister 
   ProfileProfile   Log inLog in 
Arxiv New Filter | Bookmarks & clubs | Arxiv ref/author:

[1104.3688] Pre-Big-Bang Cosmology and Circles in the Cosmic Microwave Background
 
Authors:William Nelson, Edward Wilson-Ewing
Abstract:We examine the possibility that circles in the cosmic microwave background could be formed by the interaction of a gravitational wave pulse emitted in some pre-big-bang phase of the universe with the last scattering surface. We derive the expected size distribution of such circles, as well as their typical width and (for concentric circles) angular separation. We apply these results in particular to conformal cyclic cosmology, ekpyrotic cosmology as well as loop quantum cosmology with and without inflation in order to determine how the predicted geometric properties of these circles would vary from one model to the other, and thus, if detected, could allow us to differentiate between various pre-big-bang cosmological models. We also show that the angular width and the sine of the angular radius of such circles are inversely proportional. This relation can be used in order to determine whether or not circles observed in the cosmic microwave background are due to energetic pre-big-bang events.
[PDF] [PS] [BibTex] [Bookmark]

Post new topic   Reply to topic    CosmoCoffee Forum Index -> arXiv papers
View previous topic :: View next topic  
Author Message
Nikodem Poplawski



Joined: 17 Nov 2008
Posts: 1
Affiliation: Indiana University

PostPosted: May 14 2011  Reply with quote

Pre-big-bang cosmological scenarios are attractive because they avoid the initial curvature singularity. This interesting paper studies how different pre-big-bang models can be tested using circles of anomalously low temperature variance that may exist in the Cosmic Microwave Background.
Back to top
View user's profile [ Hidden ] Visit poster's website
Display posts from previous:   
Post new topic   Reply to topic    CosmoCoffee Forum Index -> arXiv papers All times are GMT + 5 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group. Sponsored by WordWeb online dictionary and dictionary software.