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We calculate the trispectrum in ghost inflation where both the contact diagram and scale-exchange diagram are taken into account. The shape of trispectrum is discussed carefully and we find that the local form is absent in ghost inflation. In general, for the non-local shape trispectrum there are not analogous parameters to τNLloc. and gNLloc. which can completely characterize the size of local form trispectrum.
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Qing-Guo Huang (2010) studied this question.
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