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 J  C A  0  5   ( 2  0  0  9   )  0  0  5 ournal of Cosmology and  Astroparticle Physics An IOP and SISSA journal The trispectrum in the multi-brid ination Qing-Guo Huang School of Physics, Korea Institute for Advanced Study, 207-43, Cheongryangri-Dong, Dongdaemun-Gu, Seoul 130-722, Korea E-mail: [email protected] Received March 15, 2009 Accepted April 20, 2009 Published May 6, 2009 Abstract. The trispectrum is at least as important as the bispectrum and its size can be characterized by two parameters τ NL and g NL . In this short paper, we focus on the Multi-brid ination, in particular the two-brid ination model in arXiv.0805.0974, and nd that τ NL is always positive and roughly equals to ( 6 5 f NL ) 2 for the low scale ination, but g NL can be negative or positive and its order of magnitude can be the same as that of τ NL or even larger. Keywords: ination, non-gaussianity, cosmological perturbation theory ArXiv ePrint: 0903.1542 c 2009 IOP Publishing Ltd and SISSA doi:10.1088/1475-7516/2009/05/005

Qing-Guo Huang- The trispectrum in the multi-brid inflation

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