The trispectrum in the multi-brid inflation
Qing-Guo Huang; Qing-Guo Huang; School of Physics, Korea Institute for Advanced Study, 207-43, Cheongryangri-Dong, Dongdaemun-Gu, Seoul 130-722, Korea
Журнал:
Journal of Cosmology and Astroparticle Physics
Дата:
2009-05-01
Аннотация:
The trispectrum is at least as important as the bispectrum and its size can be characterized by two parameters τ<sub>NL</sub> and g<sub>NL</sub>. 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 τ<sub>NL</sub> is always positive and roughly equals to [(6/5)f<sub>NL</sub>]<sup>2</sup> for the low scale inflation, but g<sub>NL</sub> can be negative or positive and its order of magnitude can be the same as that of τ<sub>NL</sub> or even larger.
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