Primordial spectra from sudden turning trajectory

Journal Article · Sun Dec 01 04:00:00 EST 2013 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2013/12/038· OSTI ID:22369856

Noumi, Toshifumi ^[1]; Yamaguchi, Masahide ^[2]

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1. Mathematical Physics Laboratory, RIKEN Nishina Center, Saitama, 351–0198 (Japan)
2. Department of Physics, Tokyo Institute of Technology, Tokyo, 152–8551 (Japan)

Effects of heavy fields on primordial spectra of curvature perturbations are discussed in inflationary models with a sudden turning trajectory. When heavy fields are excited after the sudden turn and oscillate around the bottom of the potential, the following two effects are generically induced: deformation of the inflationary background spacetime and conversion interactions between adiabatic and isocurvature perturbations, both of which can affect the primordial density perturbations. In this paper, we calculate primordial spectra in inflationary models with sudden turning potentials taking into account both of the two effects appropriately. We find that there are some non-trivial correlations between the two effects in the power spectrum and, as a consequence, the primordial scalar power spectrum has a peak around the scale exiting the horizon at the turn. Though both effects can induce parametric resonance amplifications, they are shown to be canceled out for the case with the canonical kinetic terms. The peak feature and the scale dependence of bispectra are also discussed.

• OSTI ID: 22369856
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 12 Vol. 2013; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
AMPLIFICATION
CONVERSION
CORRELATIONS
DEFORMATION
DENSITY
DISTURBANCES
PERTURBATION THEORY
POTENTIALS
SPACE-TIME
SPECTRA
TRAJECTORIES