The Trispectrum in the Multi-brid Inflation

Abstract

The trispectrum is at least as important as the bispectrum and its size can be characterized by two parameters ${\tau }_{NL}$ and $g_{NL}$. 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 ${\tau }_{NL}$ is always positive and roughly equals to $(\frac{6}{5}{f}_{NL}{)}^2$ for the low scale inflation, but $g_{NL}$ can be negative or positive and its order of magnitude can be the same as that of ${\tau }_{NL}$ or even larger

12 pages; minor correction, refs added; further refs added, version for publication in JCAP

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Cited by in corpus (3)

• On the Issue of the ζSeries Convergence and Loop Corrections in the Generation of Observable Primordial Non-Gaussianity in Slow-Roll Inflation. Part I: the Bispectrum
• On the full quantum trispectrum in multi-field DBI inflation
• Primordial Trispectrum from Entropy Perturbations in Multifield DBI Model