摘要
In this paper,we use the result in[C.Y.Sun and D.H.Zhang,arXiv:astro-ph/0510709]to calculate thenon-Gaussianity of the racetrack models in[J.J.Blanco-Pillado,et al.,JHEP 0411(2004)063;arXiv:hep-th/0406230]and[J.J.Blanco-Pillado,et al.,arXiv:hep-th/0603129].The two models give different non-Gaussianities.Both of themare reasonable.However,we find that,for multi-field inflationary models with the non-trivial metric of the field space,the condition of the slow-roll cannot guarantee small non-Gaussianities.
In this paper,we use the result in[C.Y.Sun and D.H.Zhang,arXiv:astro-ph/0510709]to calculate the non-Gaussianity of the racetrack models in[J.J.Blanco-Pillado,et al.,JHEP 0411(2004)063;arXiv:hep-th/0406230] and[J.J.Blanco-Pillado,et al.,arXiv:hep-th/0603129].The two models give different non-Gaussianities.Both of them are reasonable.However,we find that,for multi-field inflationary models with the non-trivial metric of the field space, the condition of the slow-roll cannot guarantee small non-Gaussianities.
基金
the Knowledge Innovation Project of the Chinese Academy of Sciences under Grant No.KJCX2-SW-T08
