The inflationary trispectrum
نویسندگان
چکیده
منابع مشابه
Inflationary trispectrum from graviton exchange
We compute the connected four-point correlation function of the primordial curvature perturbation generated during inflation with standard kinetic terms, where the correlation is established via exchange of a graviton between two pairs of scalar fluctuations. Any such correlation yields a contribution to the scalar trispectrum of the order of the tensor to scalar ratio r. This contribution is n...
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The trispectrum is at least as important as the bispectrum and its size can be characterized by two parameters τNL and gNL. In this short paper, we focus on the Multi-brid inflation, in particular the two-brid inflation model in arXiv.0805.0974, and find that τNL is always positive and roughly equals to ( 6 5 fNL) 2 for the low scale inflation, but gNL can be negative or positive and its order ...
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ژورنال
عنوان ژورنال: Journal of Cosmology and Astroparticle Physics
سال: 2007
ISSN: 1475-7516
DOI: 10.1088/1475-7516/2007/01/027