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题名: Duality cascade in brane inflation
作者: Bean, Rachel ;  Chen, Xingang ;  Hailu, Girma ;  Tye, S-H Henry ;  Xu, Jiajun
刊名: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
出版日期: 2008
期号: 3, 页码:-
关键词: PROBE WMAP OBSERVATIONS ;  MICROWAVE ;  FLATNESS ;  UNIVERSE ;  HORIZON ;  MAPS
学科分类: Physics
通讯作者: Bean, R , Cornell Univ, Dept Astron, Ithaca, NY 14853 USA
部门归属: [Bean, R] Cornell Univ, Dept Astron, Ithaca, NY 14853 USA; [Chen, XG] MIT, Ctr Theoret Phys, Cambridge, MA 02139 USA; [Chen, XG; Tye, SHH; Xu, JJ] Chinese Acad Sci, Kavli Inst Theoret Phys China, Beijing 100080, Peoples R China; [Hailu, G; Tye, SHH; Xu, JJ] Cornell Univ, Newman Lab Elementary Particle Phys, Ithaca, NY 14853 USA
英文摘要: We show that brane inflation is very sensitive to tiny sharp features in extra dimensions, including those in the potential and in the warp factor. This can show up as observational signatures in the power spectrum and/or non-Gaussianities of the cosmic microwave background radiation (CMBR). One general example of such sharp features is a succession of small steps in a warped throat, caused by Seiberg duality cascade using gauge/gravity duality. We study the cosmological observational consequences of these steps in brane inflation. Since the steps come in a series, the prediction of other steps and their properties can be tested by future data and analysis. It is also possible that the steps are too close to be resolved in the power spectrum, in which case they may show up only in the non-Gaussianity of the CMB temperature fluctuations and/or EE polarization. We study two cases. In the slow-roll scenario, where steps appear in the inflaton potential, the sensitivity of brane inflation to the height and width of the steps is increased by several orders of magnitude compared to that in previously studied large field models. In the IR DBI scenario, where steps appear in the warp factor, we. find that the glitches in the power spectrum caused by these sharp features are generally small or even unobservable, but associated distinctive non-Gaussianity can be large. Together with its large negative running of the power spectrum index, this scenario clearly illustrates how rich and different a brane inflationary scenario can be when compared to generic slow-roll inflation.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000254787200003
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5572
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Bean, Rachel,Chen, Xingang,Hailu, Girma,et al. Duality cascade in brane inflation[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2008(3):-.
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