Inflation in the light of BICEP2 and PLANCK

Pramana

Subhendra Mohanty1¹ 

[1] Physical Research Laboratory, Ahmedabad 380 009, India$$

关键词: Inflation;    supergravity;    Gibbons–Hawking;    BICEP2;    PLANCK.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

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 𝑟0.05 < 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.

【 授权许可】

Unknown