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 $\tau_{ NL}^{ loc.}$ and $g_{ NL}^{ loc.}$ which can completely characterize the size of local form trispectrum.
Categories: astro-ph.CO hep-ph hep-th