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[2.26]Spectator mechanism and CMB power asymmetry
文章来源:  |  发布时间:2014-02-21  |  浏览:

Seminar

Title: Spectator mechanism and CMB power asymmetry

 

Speaker: Dr. Lingfei Wang (Lancaster University)

 

Time: 10:00AM, Feb. 26th (Wednesday)

 

Place: Theoretical Physics Division319

 

Abstract:

I will explain the spectator scenario and show its advantages compared to the curvaton scenario, under the latest Planck constraints. The spectator scenario generates a smaller non-Gaussianity, negligible isocurvature perturbations, and less tuning. It agrees well with the current Planck data in the visible sector inflation setup, as an example.
 
The recent CMB power asymmetry is particularly difficult to explain with small non-Gaussianities, but the spectator scenario succeeds with a brief tachyonic fast roll phase. Despite that the significance of the CMB power asymmetry is, and will remain, controversial, some of its properties still suggest it be an anomaly.
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