Inflation in the light of BICEP2 and PLANCK

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• 作者：SUBHENDRA MOHANTY
• 关键词：Inflation ; supergravity ; Gibbons–Hawking ; BICEP2 ; PLANCK. ; 98.80.Cq ; 04.65.+e
• 刊名：Pramana
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：86
• 期：2
• 页码：353-361
• 全文大小：263 KB
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• 作者单位：SUBHENDRA MOHANTY (1)
  
  1. Physical Research Laboratory, Ahmedabad, 380 009, India
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Physics
  Astronomy
  Astrophysics
  
• 出版者：Springer India
• ISSN：0973-7111

文摘

The BICEP2 /Keck + PLANCK joint analysis of the B-model polarization and polarization by foreground dust sets an upper bound on the tensor-to-scalar ratio of r _0.05 < 0.12 at 95% CL. The popular Starorbinsky model Higgs-inflation or the conformally equivalent Higgs-inflation model allow low r values (∼ 10−3). We survey the generalizations of the Starobinsky–Higgs models which would allow larger values (r ∼ 0.1). The Starobinsky–Higgs inflation models require an exponential potential which can be naturally derived from SUGRA models. We show that a variation of the no-scale SUGRA model can give rise to the generalized Starobinsky models which give large r. We also examine non-standard boundary conditions which would allow a large deviation of the tensor spectral index from the slow roll values and propose that the presence of a thermal component in the tensor spectrum arises from Gibbons–Hawking temperature of the de-Sitter space. Keywords Inflation supergravity Gibbons–Hawking BICEP2 PLANCK.