Effects of radiation on primordial non-Gaussianity

7th International Conference on Gravitation and Cosmology

Das, S.^1

Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India^1

关键词: Bispectrum;    Non-Gaussian features;    Primordial Non-Gaussianity;    Trispectrum;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/484/1/012055/pdf
DOI  :  10.1088/1742-6596/484/1/012055

来源: IOP

【 摘 要 】

We have studied the non-Gaussian features in single-field slow-roll inflationary scenario, where inflation is preceded by a radiation era. In such a scenario, both bispectrum and trispectrum non-Gaussianities are enhanced. Interestingly, the trispectrum in this scenario does not depend up on the slow-roll parameters, and thus, τNLis larger than fNL, which can be a signature of such a pre-inflationary radiation era.