Non-Gaussianity of inflationary field perturbations from the field equation
We calculate the tree-level bispectrum of the inflaton field perturbation directly from the field equations, and construct the corresponding f{sub NL} parameter. Our results agree with previous ones derived from the Lagrangian. We argue that quantum theory should only be used to calculate the correl...
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| Veröffentlicht in: | Journal of cosmology and astroparticle physics 2008-03, Vol.2008 (3), p.014 |
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| container_issue | 3 |
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| container_title | Journal of cosmology and astroparticle physics |
| container_volume | 2008 |
| creator | Seery, David Malik, Karim A Lyth, David H |
| description | We calculate the tree-level bispectrum of the inflaton field perturbation directly from the field equations, and construct the corresponding f{sub NL} parameter. Our results agree with previous ones derived from the Lagrangian. We argue that quantum theory should only be used to calculate the correlators when they first become classical a few Hubble times after horizon exit, the classical evolution taking over thereafter. |
| doi_str_mv | 10.1088/1475-7516/2008/03/014 |
| format | Article |
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| ispartof | Journal of cosmology and astroparticle physics, 2008-03, Vol.2008 (3), p.014 |
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| language | eng |
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| source | Institute of Physics Journals |
| subjects | ASTROPHYSICS, COSMOLOGY AND ASTRONOMY DISTURBANCES FIELD EQUATIONS GALACTIC EVOLUTION INFLATIONARY UNIVERSE LAGRANGIAN FUNCTION |
| title | Non-Gaussianity of inflationary field perturbations from the field equation |
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