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Non-Gaussianity in Nonminimally Coupled Scalar Field Theory | | Seoktae Koh
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3 Oct 2005 | | Subject: | astro-ph gr-qc hep-th | | Abstract: | We consider the non-Gaussianity of the nonlinear density perturbations in a single field inflationary model when a scalar field couples nonminimally with the gravity. Gravity theories with a nonminimal coupling could be transformed into the Einstein gravity that has a canonical kinetic terms by a suitable conformal transformation. Then we have found that a nonlinear generalization of the gauge invariant quantity $zeta_i$ is invariant under the conformal transformation. With the help of these conformal invariant property, we calculate the non-Gaussianity in the nonminimal coupled scalar field theory which is characterized by a nonlinear parameter $f_{NL}$. | | Source: | arXiv, astro-ph/0510030 | | Services: | Forum | Review | PDF | Favorites | |
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