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Bean, Rachel; Chen, Xingang; Hailu, Girma; Tye, S-H Henry; Xu, Jiajun; Bean, R , Cornell Univ, Dept Astron, Ithaca, NY 14853 USA
Duality cascade in brane inflation
发表期刊JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
关键词Probe Wmap Observations Microwave Flatness Universe Horizon Maps
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.
2008
ISSN1475-7516
期号3页码:-
学科领域Physics
收录类别SCI
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文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/5572
专题理论物理所科研产出_SCI论文
通讯作者Bean, R , Cornell Univ, Dept Astron, Ithaca, NY 14853 USA
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Bean, Rachel,Chen, Xingang,Hailu, Girma,et al. Duality cascade in brane inflation[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2008(3):-.
APA Bean, Rachel,Chen, Xingang,Hailu, Girma,Tye, S-H Henry,Xu, Jiajun,&Bean, R , Cornell Univ, Dept Astron, Ithaca, NY 14853 USA.(2008).Duality cascade in brane inflation.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(3),-.
MLA Bean, Rachel,et al."Duality cascade in brane inflation".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .3(2008):-.
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