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Non-gaussianity in nonminimally coupled scalar field theory

Oct, 2005
4 pages
Published in:
  • J.Korean Phys.Soc. 49 (2006) S787-S790
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2009201320172021202401234
Abstract: (arXiv)
We consider the non-Gaussianity of the nonlinear density perturbations in a single-field inflationary model when a scalar field couples nonminimally with gravity. Gravity theories with a nonminimal coupling can be transformed into the Einstein gravity with canonical kinetic terms by using a suitable conformal transformation. We find that a nonlinear generalization of the gauge invariant quantity ζi\zeta_i is invariant under the conformal transformation. With the help of this conformal invariant property, we calculate the non-Gaussianity, which is characterized by a nonlinear parameter fNLf_{NL}, in nonminimal coupled scalar field theory.
  • 98.80.Cq
  • CONFORMAL TRANSFORMATION
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